MCAT Biochemistry Question 94: Answer and Explanation

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Question: 94

4. Val-tRNA^Val is the tRNA that carries valine to the ribosome during translation. Which of the following sequences gives an appropriate anticodon for this tRNA? (Note: Refer back to Figure 7.5 for a genetic code table.)

A. CAU
B. AUC
C. UAC
D. GUG

Correct Answer: C

Explanation:

There are four different codons for valine: GUU, GUC, GUA, and GUG. Through base-pairing, we can determine that the proper anticodon must end with “AC.” Remember that the codon and anticodon are antiparallel to each other, and that nucleic acids are always written 5′ → 3′ on the MCAT. Therefore, we are looking for an answer that ends with “AC” (rather than starting with “CA”).

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