Which of the following statements about the genetic code is true?
A)The first position of a codon determines the amino acid.
B)An amino acid can often be specified for by more than one codon.
C)Nonsense codons contain no information.
D)Because DNA only contains four letters there are very few possible genes that can exist.

Question

Quizplus · Accepted Answer

There are 64 possible codons but only 20 amino acids, so multiple codons can specify the same amino acid.

Note: A is incorrect because the third position of a codon often determines the amino acid, and C is incorrect because nonsense codons signal the end of a protein sequence but still contain information. D is also incorrect because although there are a limited number of combinations, they are still numerous and can produce a vast array of genes.

Which of the Following Statements About the Genetic Code Is