Campbell Biology Chapter 16-17
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Campbell Biology Chapter 16-17
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Free Flashcard From Campbell Biology Chapter 16-17
Question:
There are 61 mRNA codons that specify an amino acid, but
only 45 tRNAs. This is best explained by the fact that
A) some tRNAs have anticodons that recognize four or more
different codons.
B) the rules for base pairing between the third base of a
codon and tRNA are flexible.
C) many codons are never used, so the tRNAs that recognize
them are dispensable.
D) the DNA codes for all 61 tRNAs but some are then
destroyed.
E) competitive exclusion forces some tRNAs to be destroyed
by nucleases.
Answer:
B) the rules for base pairing between the third base of a codon and tRNA are flexible.