3. Energy & Cell Processes
Steps of Translation
3. Energy & Cell Processes
Steps of Translation
1
concept
1) Initiation of Translation
5m
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2
concept
2) Elongation of Translation
4m
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3
concept
3) Termination of Translation
2m
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4
Problem
ProblemWhich of the following processes is the first event to take place in translation?
A
Base pairing of charged methionine-tRNA to AUG of the messenger RNA.
B
Binding of the larger ribosomal subunit to smaller ribosomal subunits.
C
The ribosome reaches a stop codon.
D
The small subunit of the ribosome recognizes and attaches to the mRNA.
5
Problem
ProblemWhich of the following does not occur during translation's termination step?
A
The first tRNA brings the amino acid methionine to the ribosome.
B
The small and large ribosomal subunits separate from each other.
C
The polypeptide is released from the ribosome.
D
A "stop" codon is reached by the ribosome along the mRNA.
6
Problem
ProblemWhat is the function of the release factor during translation?
A
It binds to the stop codon in the A site in place of a tRNA.
B
It releases the amino acid from its tRNA to allow the amino acid to be added to the growing polypeptide.
C
It supplies a source of energy for termination of translation and the release of the polypeptide.
D
It releases the ribosome from the rough endoplasmic reticulum and allows the polypeptide to enter the cytosol.
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PRACTICE PROBLEMS AND ACTIVITIES (3)
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