7. How many nucleotides does it take to code for a single amino acid? a. 1 b. 2

Question

7. How many nucleotides does it take to code for a single amino acid?

a. 1

b. 2

c. 3

d. varies

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8. Genes A, B, and C are three structural genes of an operon and fall in that order within the operon. A mutation occurs in Gene A that halts transcription early in the gene. What effect will this have on the levels of proteins produced by Genes A, B, and C?

a. No proteins coded by genes A, B, and C will be produced.

b. Proteins coded by genes B and C, but not gene A, will be produced

c. Proteins coded by genes A, B, and C will be produced.

d. Only proteins coded by gene A will be produced.

Explanation / Answer

7. c. 3

The nucleotide triplet that encodes an amino acid is called a codon. Each group of three nucleotides encodes one amino acid. Since there are 64 combinations of 4 nucleotides taken three at a time and only 20 amino acids, the code is degenerate (more than one codon per amino acid, in most cases).

8. a. No proteins coded by genes A, B, and C will be produced.

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