Three components which are frequently combined with the crime scene DNA sample during PCR (polymerase chain reaction) to amplify certain areas of the DNA are as follows:
Primers, Taq polymerase and Deoxynucleotide triphosphates (dNTPs)
Primers are short DNA sequences that anneal to certain sections of the target DNA. Primers are necessary for PCR because they serve as a starting point for DNA polymerase, which initiates DNA synthesis and amplifies the desired target sequence.
Taq polymerase: A DNA polymerase enzyme capable of surviving the high temperatures necessary for PCR. With each PCR cycle, Taq polymerase stretches the primers, duplicating the target DNA sequence.
Deoxynucleotide triphosphates (dNTPs) are DNA building components required by Taq polymerase to manufacture new DNA strands. These dNTPs are supplied in adequate quantities to the PCR reaction mix to promote DNA synthesis during each PCR cycle.
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Which statement about the distance between the stars and the Earth is true?
A Compared to the sun, most stars are about half as far away from Earth.
B Although all stars other than the sun are far away from Earth, some are closer than others.
C Some stars are far away from Earth, while others are as close as the clouds.
D Compared to the sun, most stars are about twice as far away from Earth.
B) Although all stars other than the sun are far away from Earth, some are closer than others.
Are stars actually closer to the Earth?
This statement is true. The distance between the stars and the Earth varies greatly depending on the location and movement of the stars. Although all stars are incredibly far away from Earth, some are relatively closer than others. For example, the nearest star to Earth, Proxima Centauri, is approximately 4.24 light-years away, while the farthest known star is more than 13 billion light-years away.
Most stars in our galaxy are tens of thousands of light-years away from Earth, and some are even hundreds of thousands of light-years away.
Therefore, the distance between the stars and the Earth can vary significantly, and no one statement can apply to all stars.
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of the taxa listed on the phylogeny, which is more closely related to bats?
The taxa on the phylogeny is closer to bats than others are Bats are related to both birds and turtles.
Which species is closer to each other?The relationship between two species in a phylogenetic tree has a very specific meaning. If two species share a more recent ancestor, they are more related, and if they share a less recent ancestor, they are less related.
A taxon in a phylogenetic tree is what?Elements that make up a phylogenetic tree. A tree's tips, also known as its leaves, can be individuals, species, populations, or even genes. Taxa are the names given to the tips if they belong to a formal group (singular: taxon). A group of organisms of any hierarchical rank, such as a family, genus, or species, is known as a "taxon."
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Which of the statements is a simplified equation for cellular respiration? O glucose + oxygen ---> carbon dioxide + waterO lipid + water ---> fatty acids + carbon dioxide O carbon dioxide + water + light ---> glucose + oxygen O glucose + nitrogen ---> carbon monoxide + water
The explanation that is an improved condition for cellular respiration is A: glucose + oxygen → carbon dioxide + water.
Cell breath is the interaction by which cells convert supplements, like glucose, into energy that can be utilized by the cell. A mind-boggling set of biochemical responses happens in the mitochondria of eukaryotic cells and the cytoplasm of prokaryotic cells.
The course of cell breath includes the breakdown of glucose through a progression of responses, eventually delivering ATP, the energy money of the phone. The responses associated with cell breath can be partitioned into three fundamental stages: glycolysis, the citrus extract cycle, and oxidative phosphorylation
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Fill The Blank? to use a spectroscope, position the tool to allow light to enter through the _________
To use a spectroscope, position the tool to allow light to enter through the slit. The light will reflect off the diffraction grating.
What is a spectroscope?A spectroscope may be defined as a type of laboratory instrument or device that significantly measures the spectrum of light. It dissociates the light from a single material into its component colors like the way through which a prism splits white light into different seven colors.
According to the context of this question, a spectroscope generally works on the principle through which a slit allows the white light to pass through. Once the light passes through, a diffraction grating splits the white light into different seven colors of the rainbow.
Therefore, to use a spectroscope, position the tool to allow light to enter through the slit. The light will reflect off the diffraction grating.
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Which is closest in physical proximity to the nucleic acid of a virus? spike; capsid; envelope. capsid
The capsid is physically closest to a virus's nucleic acid. A protein core is enclosed within the capsid of some of the more complex viruses.
In a virus, where is the nucleic acid located?Structure of a virus. The capsid, a protein coating, surrounds a single nucleic acid molecule in the virion of simpler viruses; The nucleocapsid is made up of the capsid and the nucleic acid inside. A protein core is enclosed within the capsid of some of the more complex viruses.
Is the viral capsid and envelope the same thing?The fact that the capsid is a protein-based coat and the envelope is a lipid-based membrane is the primary distinction between the two structures. While enveloped viruses only have an envelope, all virion particles have capsids.
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is glucose a monosaccharide
Yes, glucose is a monosaccharide. Monosaccharides are the simplest form of carbohydrates, which cannot be broken down into simpler sugars.
Glucose is a six-carbon sugar (hexose) with the molecular formula C6H12O6, and it is the most common monosaccharide found in nature. Glucose is an important source of energy for living organisms, and it is a primary component of many carbohydrates, including starch, cellulose, and glycogen.
It is also a primary fuel for the brain and the central nervous system. Other examples of monosaccharides include fructose and galactose. They are commonly found in fruits, vegetables, and other plant-based foods, as well as in dairy products and some types of meat.
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Which of the following is predicted by the punctuated equilibrium model of speciation? (a) Few if any transitional species will be found in the fossil record (b) Evolution proceeds slowly and gradually over time (c) The environment has always changed slowly over time (d) Species adapt gradually to changes throughout time (e) Transitional species should be the most abundant fossils found.
Predicted by the punctuated equilibrium model of speciation (a) Few if any transitional species will be found in the fossil record.
In general , the Punctuated equilibrium is the concept of evolution that occurs in spurts beside following the slow, but steady path as Darwin suggested. Also , the Long periods of harmony and less activity in terms of extinctions or introduction of new species that is interrupted by intermittent bursts in evolution . Punctuated equilibrium also predicts that a lot of evolutionary change can takes place in short periods of time fixed to speciation events.
Hence, Punctuated equilibrium also takes place as genetic variations are passed down faster, which increase the rate of evolution, and speciation. examples includes Tyrannosaurid fossils and Mollusks in the Turkana Basin .
Hence , A is the correct option
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The tentacles of an octopus and the limbs of a lizard perform the same function but have a different evolutionary lineage. Therefore, they are
.
The front legs of a cat and the arms of a human share a bone structure that suggests a common evolutionary lineage. Therefore, these skeletal structures are
They are analogous structures; these skeletal structures are homologous structures.
What is an analogous structure?An analogous structure is a structure that performs the same function in different organisms but has different evolutionary origins. These structures are the result of convergent evolution, where similar environmental pressures lead to the development of similar adaptations in unrelated organisms.
What is a homologous structure?A homologous structure is a structure that has a similar evolutionary origin in different organisms but may have different functions. These structures are the result of divergent evolution, where a common ancestor develops different adaptations over time due to different environmental pressures in different lineages. Homologous structures can provide evidence of evolutionary relationships between organisms.
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Answer:
a)The octopus tentacles and the lizard limbs are Analogous.
b)These Skeletal structures are Homologous structures
Explanation:
a)Analogous features/parts comparison are usually associated with the same functions but a different evolutionary lineage.
b)The front legs of a cat and the arms of a human share a bone structure that suggests a common lineage, thus they are homologous.
Design your own experiment to test the movement of water into or out of a substance/ organism. Consider things like living/ nonliving, adding solutes, varying time, varying temperature, in your design. Illustrate and explain your experiment AND your hypothesis.
Answer:
My experiment would involve testing the movement of water into or out of a living organism. I would design an experiment where I add a certain amount of a solute to a living organism, such as a plant, then measure the amount of water that enters or leaves the organism over a period of time. In addition, I would vary the temperatures to see how the rate of movement is affected. My hypothesis is that the rate of water movement will increase as the temperature increases, and the amount of solute added to the organism will also affect the rate of water movement.
in clotting, prothrombin activator catalyzes prothrombin into thrombin, which in turn converts fibrinogen into fibrin.truefalse
That statement is true. Prothrombin activator catalyzes prothrombin into thrombin, which then converts fibrinogen into fibrin to form a blood clot.
What is prothrombin?Prothrombin is a protein that plays a crucial role in blood clotting, also known as coagulation. It is produced in the liver and released into the bloodstream in an inactive form. When an injury occurs and blood vessels are damaged, a series of chemical reactions occur that lead to the activation of prothrombin. This process involves the formation of an enzyme complex called prothrombin activator, which cleaves prothrombin to produce the active enzyme thrombin.
The process of blood clotting involves a series of steps, one of which is the conversion of prothrombin into thrombin. Prothrombin is an inactive precursor protein that is activated by an enzyme complex called prothrombin activator. Once prothrombin is activated, it catalyzes the conversion of fibrinogen into fibrin, which is the main component of blood clots.
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Compared to aerobic respiration, glycolysis produces _________ atp.
In anaerobic circumstances, pyruvate converts to lactate through anaerobic glycolysis. Anaerobic breath brings about the development of 2 ATP particles.
In oxygen-consuming circumstances, pyruvate enters the citrus extract cycle and goes through oxidative phosphorylation prompting the net creation of 32 ATP particles. Glycolysis (see "Glycolysis" idea) is an anaerobic interaction - it needn't bother with oxygen to continue. This interaction delivers an insignificant measure of ATP. The Krebs cycle and electron transport in all actuality do require oxygen to continue, and within the sight of oxygen, these interactions produce significantly more ATP than glycolysis alone.
This high creation happens because of the total breakdown of glucose into CO2 and Energy (ATP). In oxygen-consuming breath 38 ATP is delivered through in an anaerobic breath just 2 ATP is created with the development of an extra side item like lactic corrosive or ethanol.
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what is muscles in leg?
The quadriceps, hamstrings, adductors in the upper leg or thigh, and calves in the lower legs are the major muscular groups in the legs. These muscle groups are composed of numerous smaller muscles, and there are other stabilizing muscles that are not included in these groups.
Your upper and lower legs contain a variety of muscles. These muscles work together to allow you to walk, run, jump, stand on your toes, and flex your feet (lift your toes up toward your knee). Your leg muscles collaborate with your bones, tendons, and ligaments to help you move and stabilize your body.
Muscle strains (tears or overstretching of a muscle) in the legs are common injuries. They are frequently caused by excessive exertion or overuse. The term "legacy" refers to the process of collecting and preserving physical evidence. You can keep your leg muscles operating properly by keeping a healthy weight and focusing on general health.
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Why do harmful alleles stay in a population?
Harmful alleles happen to stay in a population because they get linked to the beneficial alleles.
Alleles are basically the two different copies of the same gene and are found in the population. The allelic frequency of a particular population may or may not change over a period of time. The harmful alleles which are responsible for causing various diseases stay in the population as they sometimes get linked to the beneficial genes.
The natural selection is not able to eliminate diseases. Although, it helps in producing the progenies and also selecting individuals which have desirable traits but this is not equivalent to the absence of diseases from a population.
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when phospholipids are placed in water they spontaneously from a bilayer with which of the followingA. phospholipid bilayerB. it allows the nonpolar tails to avoid contact with waterC. the polar heads on the surface and the non polar tails in the interiorD. - receptor mediated endocytosis
phagocytosis
-endocytosis
-pinocytosis
Option A is Correct. Phospholipids form a bilayer with other phospholipids when they are introduced in water. The head regions travel away from the bilayer's edge and make contact with the nearby water molecules.
Phospholipids naturally form bilayers in aqueous solutions because their fatty acid tails are not very soluble in water. As a result, the hydrophobic tails are hidden inside the membrane's core while the polar head groups are exposed on both sides and in touch with the water.
Phospholipids form a structure known as a bilayer when they are submerged in water. The interior of the bilayer, farthest from the water, is where the water-averse tail regions congregate.
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Correct Question:
When phospholipids are placed in water they spontaneously from a bilayer with which of the following
A. phospholipid bilayer
B. it allows the nonpolar tails to avoid contact with water
C. the polar heads on the surface and the non polar tails in the interior
D. receptor mediated endocytosis.
where input from the retinas of both eyes is processed in?
Input from the retinas of both eyes is processed in the visual cortex, which is located in the occipital lobe of the brain.
What is visual cortex?The visual cortex is the part of the brain that processes visual information from the eyes. It is located in the occipital lobe, at the back of the head. The visual cortex receives raw visual information from the eyes and turns it into meaningful images. It is responsible for recognizing shapes, colors, and objects, and for organizing the information it receives into a cohesive whole. It also plays a role in depth perception and motion detection. The visual cortex is an incredibly complex structure, and its full capabilities are still not fully understood.
The visual cortex is responsible for processing visual information from both eyes, including color, motion, form, and depth.
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In whitetail deer, females seldom grow antlers. Which BEST explains why male whitetail deer grow antlers but females seldom grow antlers? A. Female deer have no need for antlers. B. Male deer are older than female deer. C. Antler growth is controlled by genes. D. Antler growth depends on behavior.
C, antler growth is controlled by genes, is the most accurate explanation for why male whitetail deer grow antlers but females seldom grow antlers.
The BEST explanation for why male whitetail deer grow antlers but females seldom grow antlers is that antler growth is controlled by genes. In most deer species, antlers are primarily a secondary sexual characteristic that males use to compete for mates during the breeding season. The presence of antlers in males is largely determined by genetic factors, specifically the presence of testosterone, which is responsible for initiating antler growth.
While female deer may also benefit from antlers in terms of protection or foraging, the selective pressure for antlers is much lower in females compared to males. Thus, females may have evolved to allocate their resources towards other traits that are more advantageous for their survival and reproduction.
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1. which factors are likely to lead to a decrease in membrane fluidity?
Temperature, cholesterol, as well as the type of fatty acids found in the phospholipids that make up the cell membrane are the three main variables that affect how fluid the membrane.
These variables change how the phospholipids interact and coexist, which in turn impacts how fluid the cell membrane is.More specifically, the fluidity of the membrane is influenced by the saturated or unsaturated nature of the fatty acids. No double bonds exist inside the hydrocarbon chain of saturated fatty acids, and they contain the most hydrogen. As there are no double bonds, the membrane is much more rigid and closely packed. Cholesterol has a bidirectional effect on membrane fluidity; at high temperatures, it reduces fluidity, and at low temperatures, it promotes fluidity.
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what cells are in the stratum spinosum
The stratum spinosum is the second layer of the epidermis, located above the basal cell layer.
It is composed of several layers of cells, primarily keratinocytes, which are cells that produce the protein keratin, a key component of skin, hair, and nails. In addition to keratinocytes, the stratum spinosum contains a small number of Langerhans cells, which are specialized immune cells that help protect the skin against infections. The Langerhans cells are involved in the immune response to foreign substances that come into contact with the skin, such as allergens or pathogens. The stratum spinosum also contains melanocytes, which are responsible for producing the pigment melanin that gives skin its color.
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Given how our planet is changing, predict what snakes might look like in future rock layers.
It cannot be predicted with certainty how snakes might look in future rock layers, as evolutionary changes can be unpredictable and depend on a wide range of factors, which are specified below.
What are evolutionary changes?Evolutionary changes are the changes in morphology or physiology of an organism due to changing environmental conditions over time and are inherited to their offspring for increasing the chances of survival.
The few possible scenarios that could lead to changes in snake morphology over time:
Climate change: As global temperatures continue to rise, snakes may be forced to adapt to changing environmental conditions. Habitat loss: As human development continues to encroach on natural habitats, snakes may be forced to adapt to new types of environments. This could lead to changes in their behavior or physical characteristics, such as the development of new types of scales or the evolution of different types of locomotion.Predation pressure: Changes in predator-prey relationships could also drive evolutionary changes in snakes over time. For example, if snakes are facing increased predation pressure from birds of prey, they may evolve longer, more streamlined bodies that are better suited for evading capture.The timescales involved in evolutionary change are often very long, so any changes to snake morphology that occur in the future may not be visible in the rock layers for many millions of years.
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Increased levels of carbon dioxide in the blood will result in decreased:a. parasympathetic stimulation to the heartb. sympathetic stimulation to the heartc. blood flow to the lungsd. heart ratee. cardiac outpu
The correct option is (B) sympathetic stimulation to the heartc. Increased carbon dioxide levels in the blood will result in increased sympathetic stimulation to the heart.
Increased carbon dioxide levels trigger chemoreceptors in the carotid and aortic bodies to send signals to the cardiovascular center in the brainstem, resulting in increased sympathetic stimulation to the heart, which in turn increases heart rate and cardiac output.
Sympathetic stimulation to the heart is the correct answer. Increased carbon dioxide levels in the blood will result in increased sympathetic stimulation to the heart, which increases heart rate and cardiac output.
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Which of these examples best exhibits one of Darwin's inferences? A. Trees occupying the same area fight for physical space that allows sun access B. Over generations being taller was favorable, and so human height has increased in human poputations C. Dog breeds have different skull and snout sizes D. Ant queens produce 1000 s of offspring most of which die
Statement D best explains one of Darwin's inferences. This statement explains Darwin's second inference based on the survival nature of the species.
There are two main inferences put forward by Darwin based on his observation. The first is that hereditary features cause population members to differ from one another. The species can have more offspring, but many of them do not survive or reproduce.
In the given situation, statement D is the correct inference. Because here, about 1000 offspring are produced by the ant queen but only a few survived. Most of the offspring died because of their inability to adapt to a particular environment.
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disaccharides consist of __________ molecules of sugar joined together.
Disaccharides are created when you combine two sugar molecules.
What do the terms disaccharides mean?Disaccharides are water soluble, just as monosaccharides. There are three typical examples: sucrose, lactose, and maltose. Disaccharide's standard formula is C12H22O11.
What is the purpose of a disaccharide?Disaccharides are converted by our bodies to simple sugars (simple sugars) for the small intestine to absorb when we ingest meals containing them.
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1)which types of molecules are allowed to diffuse across a membrane easily ? 2) which molecules require a transport protein? 3) what are some types of transport proteins ?4) Do all transport proteins require energy ? Why ? 5) when does you need energy to transport across a membrane ? 6) does active transport require a transmembrane protein ? Why / why not ?
1. Tiny nonpolar molecules can easily traverse cell membranes because they are soluble in the lipid bilayer. Examples of these molecules are O2 and CO2.
1. Continue : Larger uncharged polar molecules, like glucose, cannot diffuse across membranes, but small uncharged polar molecules, like H2O, may.
2. In order to successfully penetrate the membrane, larger polar and charged molecules like sugars and amino acids also require the assistance of proteins.
3. The two main kinds of membrane transport proteins are carrier proteins and channel proteins.
4. The cell must use energy for all active transport types. Secondary active transport proteins obtain their energy via ATP-derived activities, whereas primary active transport proteins obtain their energy directly from ATP.
5. Molecules engage in passive transport when they travel down their concentration gradient; active transport, which needs energy, occurs when they move up their gradient.
6. Active transport is a type of transportation where molecules must move with the help of energy. By moving against the concentration gradient, molecules travel from low concentration to high concentration. Moreover, active transport is extremely selective and calls for certain membrane proteins.
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Correct Question:
1)What types of molecules are allowed to diffuse across a membrane easily ?
2) What molecules require a transport protein?
3) what are some types of transport proteins ?
4) Do all transport proteins require energy ? Why ?
5) when does you need energy to transport across a membrane ?
6) does active transport require a transmembrane protein ? Why / why not ?
What type of nitrogenous base is thymine?
Answer:
Thymine is a type of pyrimidine nitrogenous base.
during the menstrual cycle the oocyte is released from the follicle. in what organ does the follicle develop, and what is the immediate destination of the oocyte?
During the menstrual cycle, the follicle develops in the ovary, and the immediate destination of rhe oocyte is the fallopian tube.
A menstrual cycle is a repeatitive phase of women's life. It occurs every 28 days. The oocyte is released from the ovary into the ampullary region of the fallopian tube. This is called ovulation. The phase at which the follicles develop themselves to mature an oocyte before they release it is called the follicular phase.
Follicular phase is also called as proliferative phase because the endometrial lining of the uterus also thickens and become receptive for the maturing zygote if any. If the fertilization occurs, the ampullary region of the fallopian tube is the site for it.
If the oocyte is not fertilized by a sperm, it would rupture, and the endometrial lining will shed itself as the menstrual blood. This is called menstruation.
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What are the 4 major muscles in the leg?
The four major leg muscles are hamstrings, adductors, pectineus, and the quadriceps.
Leg muscles basically consist of some long muscles, which basically help in the long stretching distances. The legs present in mammals and especially human beings are basically the lower limbs which happen to provide support as well movement for the organism. There are a different types of muscles present in the different parts of the leg.
The hamstrings basically enable the knees to be able to flex and bend. The quadriceps aid in straightening the knee when it is recovering from a bent position. Adductor basically let the thighs to be able to bind together and pectineus muscle is basically a hip adductor.
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What are the 5 parts of the nose?
The human nose is composed of several different parts, each with its own function. The five main parts of the nose are Nasal Bones, Nasal Cavity, Septum, Sinuses and Turbinate's:
Nasal Bones: These are the two small bones that make up the bridge of the nose. They are located at the top of the nose and provide structural support.
Nasal Cavity: This is the large, hollow space inside the nose that air flows through. The nasal cavity is lined with mucous membranes that help to filter and warm the air as it enters the body.
Septum: The septum is the wall of cartilage that divides the nasal cavity into two separate chambers.
Turbinate's: These are small, bony structures inside the nasal cavity that help to increase the surface area of the mucous membranes. This helps to filter and humidify the air as it passes through the nose.
Sinuses: The sinuses are hollow spaces located in the bones of the face that connect to the nasal cavity. They help to lighten the skull and provide resonance to the voice.
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All organisms require an influx of substances from their habitat to meet their — needs for chemical elements and energy.
a. nutritinal
b. water
c. calcium
All living organisms require a continuous intake of substances from their environment to meet their nutritional needs for chemical elements and energy, the correct option is (a).
Organisms acquire nutrients through various mechanisms such as photosynthesis, ingestion, absorption, or symbiosis. For instance, plants use photosynthesis to produce their own food using sunlight, carbon dioxide, and water, while animals obtain nutrients by consuming other organisms. Microorganisms can also obtain their nutritional needs from organic or inorganic sources through absorption or symbiosis. The availability of nutrients in an organism's habitat can affect its growth, reproduction, and survival. Therefore, understanding the nutritional needs of different organisms is crucial for maintaining healthy ecosystems.
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Select all the components of cell theory as outlined by Schleiden, Schwann, and Virchow, 3 All cells come from preexisting cells The cell is the fundamental unit of life. 0.27 points Skipped Variation in coll structure is the foundation of evolutionary change A cell is only considered alive if it interacts with another cell eBook Print References All organisms are made of one or more cells. In a multicellular organism, each cell is an organism its own right
The components of cell theory as outlined by Virchow , Schwann, and Schleiden. So the correct answer is:
All of the organisms are made of one or more cells.
Cell is the fundamental unit of life.
All cells come from preexisting cells.
What was the theory before proposition of the cell theory?Before the proposition of the cell theory, the prevailing theory was the theory of spontaneous generation, which held that living organisms could arise spontaneously from non-living matter. This theory was widely believed for centuries, and was supported by various observations such as the appearance of maggots on decaying meat, or the sudden appearance of fish in dried-up ponds after a rainstorm.
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How does inbreeding affect the Hardy-Weinberg equilibrium?
A. It results in a higher level of either dominant or recessive homozygotes.
B. It results in a higher level of heterozygotes.
C. It has no effect on the Hardy-Weinberg equilibrium.
D. It results in higher levels of both recessive and dominant homozygotes at the same time.
Option A is Correct. Inbreeding has an impact on the Hardy-Weinberg equilibrium by increasing the proportion of homozygotes that are either dominant or recessive.
The Hardy Weinberg equilibrium is valid if there is sufficient population size, no mutation, and no population structure (random mating). Hardy Weinberg is irrelevant in this situation because breeding is a sort of controlled mating that takes place in a small, isolated population. Inbreeding hence constitutes a violation of Hardy Weinberg.
Many factors, including mutations, natural selection, nonrandom mating, genetic drift, and gene flow, have the potential to upset the Hardy-Weinberg equilibrium. For instance, mutations introduce new alleles into a population, disrupting the balance of allele frequencies.
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