MCAT Question A Day - 5/7/14 - Answer!
Which of the following is always true concerning the base composition of DNA?
A. In each single strand, the number of adenine residues equals the number thymine residues.
B. In each single strand. the number of adenine residues equals the number of guanine residues.
C. In a molecule of double stranded DNA. the ratio of adenine residues to thymine residues equals the ratio of cytosine residues to guanine residues.
D. In a molecule of double stranded DNA. the number of adenine residues plus thymine residues equals the number of cytosine residues plus guanine residues.
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C is correct. Since A always binds with T and G always binds with C, both the ratio of A:T and the ratio of G:C equal one.
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