Multiple Choice
In the context of the central dogma, which enzyme catalyzes transcription of DNA into RNA?
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1. Introduction to Biochemistry
Central Dogma
Multiple Choice
In the genetic code during translation, how many mRNA codons specify (code for) a single amino acid in a growing polypeptide chain?
A
One codon
B
Four codons
C
Three codons
D
Sixty-one codons
Verified step by step guidance1
Understand that during translation, the genetic code is read in sets of three nucleotides called codons on the mRNA strand.
Each codon corresponds to a specific amino acid or a stop signal during protein synthesis.
Recognize that a single amino acid is specified by exactly one codon at a time during translation, meaning the ribosome reads one codon to add one amino acid to the growing polypeptide chain.
Note that while multiple codons can code for the same amino acid (degeneracy of the genetic code), each codon itself corresponds to only one amino acid in the sequence.
Therefore, the number of codons that specify a single amino acid in the polypeptide chain at any given moment is one codon.
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