Biology

The genetic code table shows the amino acids that correspond to mRNA codons. Each codon is read from 3′ (first nucleotide) to 5′ (third nucleotide). A DNA template strand is shown.

Which amino acid sequence will be assembled from the mRNA associated with this strand?

DNA template strand: 5′-GCG ACA TAC ACT-3′

(A) Ala-Cys-Met
(B) Arg-Cys-Met
(C) Ala-Thr-Tyr-Thr
(D) Ala-Thr-Tyr-Trp
(E) Arg-Thr-Tyr-Thr
  1. Correct Answer: B

    Explanation:

    The DNA template is used to produce a complementary RNA strand with the sequence 3′-CGC UGU AUG UGA-5′. The first three codons specify the amino acids alanine, cystine, and methionine, respectively. The last codon is a stop codon, which tells the ribosome to end translation.

Test ID: 1321
Source: SAT Biology Practice Tests