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Roman55 [17]
3 years ago
10

Which step can occur even more rapidly by PCR?a. target DNA removed from cells and isolated b. cloning host treated with calcium

chloride and receives plasmid c. target DNA and plasmid treated with the same restriction endonuclease d. desired protein is produced by cloning host e. gene is amplified by multiplication of cloning host

Biology
1 answer:
lisabon 2012 [21]3 years ago
7 0

Answer:

E. Gene is amplified by multiplication of cloning host

Explanation:

PCR is a very powerful technique that can help us to amplify exponentially one gene from a very small sample of DNA.

As seen in the attached image, the process begins with a single DNA molecule, for the first cycle, that DNA molecule denaturalizes into two strands, the primers bind to their complementary sides and then the DNA polymerase builds the new DNA strands. The number of copies of the gene that can be obtained with each cycle are 2ⁿ copies, where n is the cycle number.

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Anestetic [448]

Answer:

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Explanation:

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4 0
3 years ago
On a global scale, energy _____ ecosystems whereas chemical elements _____ ecosystems. see concept 55.1 (page 1237) on a global
Kay [80]
<span>The choices for this question are:
</span>-is biologically magnified in ... are recycled in
-is dissipated in ... flow through
-flows through ... are recycled in
-is continuously supplied to ... are continuously removed from
<span>-is recycled in ... flow through</span><span>

On a global scale, energy flows through ecosystems whereas chemical elements are recycle in ecosystems. So the answer is the third option. 

Energy flows through the ecosystem. Most energy comes from sunlight and it is transformed into chemical energy by autotrophs. When they are consumed by heterotrophs the energy is passed on, until it dissipates as heat.  
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Chemical elements like carbon and nitrogen, on the other hand, are cycled between biotic and abiotic factors in an ecosystem. This is not possible for energy. These chemical elements come from abiotic factors like the air, light and soil. They are incorporated in the biomass of the photosynthetic organisms and are consumed by other organisms. They are changed back into their inorganic form when the organism dies and are broken down by decomposers and the cycle goes on. So they are constantly being recycled. 

In summary, energy needs a continuous source to be able to maintain and sustain the energy flow in the ecosystem. Chemical elements, on the other hand, are just recycled through processes between abiotic factors and biotic factors. </span>
8 0
3 years ago
Which of the following is NOT a structural difference between RNA and DNA?
kaheart [24]

The answer is D.

DNA must be turned into RNA in order to leave the nucleus.

Good luck! :)

5 0
3 years ago
Helppp meeee!!!! <br> !!!<br> !!!
xxMikexx [17]
What is the question?
6 0
3 years ago
Adult skin cells can no longer become other types of cells because they have already undergone
Ludmilka [50]
The answer is differentiation.

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7 0
3 years ago
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