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Mila [183]
4 years ago
12

Pls help. thx.

Biology
2 answers:
Ad libitum [116K]4 years ago
6 0
Hey there!

<span>Which two molecules carry energized electrons to the second part of the cellular respiration process?

</span>
<span>NADH and FADH2 are two molecules energized electrons to the second part of the cellular respiration process. This means your answer is the 2nd option.

Hope this helps you.
Have a great day (:
</span>
svlad2 [7]4 years ago
4 0

Ok so i just took the test and the answer is b. NADH AND FADH2

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What proportion of DNA molecules will contain any radioactivity after two rounds of replication?
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DNA replication, which occurs only once in each cell generation, <u>requires many "building blocks", enzymes, and a great deal of energy in the form of ATP.</u> The nucleotides, which are the building blocks of DNA, have to be assembled and available in the nucleus along with the energy to bind them together.  Each nucleotide consists of three parts: a nitrogen-containing ring structure called a nitrogen base, a five-carbon sugar, and at least one phosphate group.

Through the action of DNA polymerase during replication,<u> new nucleotides bind to the corresponding nucleotide of the original chain (A to T, C to G).</u>

Since the DNA strands are anti-parallel, and replication proceeds only in the 5' to 3' direction on both strands, one strand will form a continuous copy, while the other will form a series of short fragments known as Okazaki fragments. The chain that is synthesized continuously is known as the forward chain and the chain that is synthesized in fragments is known as the backward chain.

Then, since replication is semi-conservative, the new strand will have nucleotides with "normal" nitrogen while the new strand created from that same DNA molecule will incorporate nucleotides with radioactive nitrogen. So, after two rounds of replication half of DNA molecules will contain one strand with radioactive nitrogen. And the other half will contain two strands with radioactive nitrogen.

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