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Umnica [9.8K]
3 years ago
12

Before replication can take place.(1) A. DNA polymerases must add complementary nucleotides to DNA. B. the two strands of DNA mu

st separate. C. the covalent bonds in DNA must break. D. helicases must break the bonds in the nucleotides.
Biology
1 answer:
andriy [413]3 years ago
4 0

Answer:

The correct answer is B. the two strands of DNA must separate.

Explanation:

DNA is a double-stranded structure. The two strands are joined together by the formation of hydrogen bonds between complementary nucleotides. So before the replication takes place these two strands must be separated.

The separation of DNA strand is accomplished by the action of a helicase enzyme which breaks the hydrogen bond between complementary nucleotides and separated the two DNA strands.  

After separation, the DNA polymerase binds to separated DNA and replicating the DNA. So the right answer is B.

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Epidermis/trans-epidermal water loss is the passive evaporation of water from the skin. This is the reason why skin sometimes may feel very dry after a person wakes up. This evaporation happens de to the presence of water vapor gradient across both sides of the skin.

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2 years ago
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6 0
3 years ago
Read 2 more answers
Please help, its for a test!
SVEN [57.7K]

(hi, i dont know about this one personally, but i found an answer somewhere else on the internet thatll hopefully help u)

Answer: They consist of long chains of C, H, and O.

Explanation:

In terms of chemical composition, lipids differ from nucleic acids and proteins because they mostly just contain carbon, hydrogen, and oxygen (except for phospholipids which of course contain phosphorous). In addition to those elements, proteins contain nitrogen and sulfur, and nucleic acids contain nitrogen and phosphorous.

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