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Verdich [7]
3 years ago
6

Place the following steps of the DNA extraction and PCR process in the correct order. Not all labels will be used.

Biology
1 answer:
never [62]3 years ago
7 0
DNA isolation is a process of purification of DNA from sample using a combination of physical and chemical method while on the other hand, Polymerase chain reaction (PCR<span>) is a technique used in molecular biology to amplify a single copy or a few copies of a piece of DNA across several orders of magnitude, generating thousands to millions of copies of a particular DNA sequence.</span>
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A table with four organisms and their primary role in an ecosystem is shown.
Otrada [13]

Answer:Each and every one of us have several roles. Organisms in a community play other roles too. An organism's role within an ecosystem depends on how it earn its nutrients. Organisms collect their nutrients in very different actions, so they have different roles in an ecosystem.

Explanation:  

The food chain describes who eats whom in the wild. Every living thing—from one-celled algae to giant blue whales—needs food to survive. Each food chain is a possible pathway that energy and nutrients can follow through the ecosystem.

For example, grass produces its own food from sunlight. A rabbit eats the grass. A fox eats the rabbit. When the fox dies, bacteria break down its body, returning it to the soil where it provides nutrients for plants like grass.

Of course, many different animals eat grass, and rabbits can eat other plants besides grass. Foxes, in turn, can eat many types of animals and plants. Each of these living things can be a part of multiple food chains. All of the interconnected and overlapping food chains in an ecosystem make up a food web.

3 0
3 years ago
Suppose a population is carrying a condition controlled by two alleles: R (dominant) and r (recessive). Only homozygous individu
White raven [17]

<span><u>The answer is A. 72.25 percent.</u>

The Hardy-Weinberg principle can be used:</span>

<em>p² + 2pq + q² = 1</em> and <em>p + q = 1</em>

where <em>p</em> and <em>q</em> are the frequencies of the alleles, and <em>p²</em>, <em>q²</em> and <em>2pq </em>are the frequencies of the genotypes.

<span>The <em>r</em> allele (<em>q</em>) is found in 15% of the population:
q = 15% = 15/100
Thus, q = </span><span>0.15

To calculate the <em>R</em> allele frequency (<em>p</em>), the formula p + q = 1 is used:
If p + q = 1, then p = 1 - q
p = 1 - 0.15
Thus, </span><span>p = 0.85

Knowing the frequency of the <em>R</em> allele (<em>p</em>), it is easy to determine the frequency of the RR genotype (p²):
p² = 0.85² = 0.7225

Expressed in percentage, p² = 72.25%.</span>

4 0
3 years ago
Botulinum toxin binds to receptors present at the axon terminal in order to enter the neuron
Kisachek [45]
<span>Botulinum toxin does not bind to receptors presemt at the axon terminal in order to enter the neuron. It is a neurotoxin protein produced by Clostridium botulinum which is a bacterium. It prevents the release of neurotransmitter from axon endings that results to flaccid paralysis.</span>
3 0
3 years ago
Read 2 more answers
What type of circulatory system do earthworms have?
Irina-Kira [14]

Answer:

a closed circulatory system.

Explanation:

an earthworm circulates blood exclusively through vessels.

6 0
2 years ago
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2. \"The present is the key to the past.\" This statement rephrases the ____. (1 point). principle of cross-cutting relationship
Anestetic [448]
2. This statement rephrases the principle of uniformitarianism. The correct option among all the options that are given in the question is the third option or the penultimate option.

3. A worm would would stand a poor chance of being fossilized because worms have no hard parts. The correct option among all the options that are given in the question is the third option. 
3 0
3 years ago
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