Exercise: Protein Synthesis

Questions for: Protein Synthesis

The pathway of a tRNA during polypeptide elongation on the ribosome is
A:
A site → P site → E site
B:
P site → entry site → exit site
C:
A site → P site → entry site
D:
P site → A site → E site
Answer: A
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The direction of amino acid transfer to the growing polypeptide chain is
A:
from the A (aminoacyl tRNA site) site to the P (peptidyl tRNA site) site on the ribosome
B:
from the P site to the A site on the ribosome
C:
from the A site to the E (exit tRNA site) site on the ribosome
D:
from the P site to the E site on the ribosome
Answer: B
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Signal peptide protein removal that is translocated across a membrane is accomplished by
A:
fMet aminopeptidase
B:
trypsin
C:
signal peptidase
D:
chymotrypsin
Answer: C
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Ribosomes select the correct tRNAs
A:
then bind to the appropriate mRNA
B:
solely on the basis of their anticodons
C:
depending on their abundance in the cytosol
D:
with the least abundant anticodons
Answer: B
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Which of the following is not necessary for protein synthesis to occur, once transcription is completed?
A:
tRNA
B:
Ribosomes
C:
mRNA
D:
DNA
Answer: D
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