Multiple Choice
In the context of the central dogma, what are the two major steps of protein synthesis?
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1. Introduction to Biochemistry
Central Dogma
Multiple Choice
In the context of the central dogma and the standard genetic code, what does the mRNA codon UAA specify during translation?
A
Methionine (start codon)
B
Tyrosine
C
Tryptophan
D
A stop signal (translation termination)
Verified step by step guidance1
Recall that the central dogma of molecular biology describes the flow of genetic information from DNA to RNA to protein, where mRNA codons are read during translation to specify amino acids or signals.
Understand that the standard genetic code consists of triplet codons in mRNA, each corresponding to either an amino acid or a special signal such as start or stop.
Identify that the codon UAA is one of the three stop codons (UAA, UAG, UGA) in the genetic code, which do not code for any amino acid but instead signal the termination of translation.
Recognize that when the ribosome encounters the UAA codon during translation, it triggers the release of the newly synthesized polypeptide chain, effectively ending protein synthesis.
Conclude that UAA does not specify an amino acid like methionine, tyrosine, or tryptophan, but rather functions as a stop signal to terminate translation.
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