How could a health care professional most accurately explain an aspect of the underlying structure of DNA to a colleague who is unfamiliar with genetics?
A)
"DNA consists of nucleotides plus one of the four nitrogenous bases."
B)
"In the base pairs, adenine combines with thymine and guanine with cytosine."
C)
"Thymine and cytosine are considered the purine bases."
D)
"The backbone of a DNA molecule consists of either deoxyribose or phosphoric acid."
Ans:
B
Feedback:
The base pairings of DNA are such that adenine combines with thymine and guanine with cytosine. DNA also includes the sugar deoxyribose, while thymine and cytosine are considered the pyrimidine bases. The backbone of DNA includes both deoxyribose and phosphoric acid.
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