Protein Synthesis – Section 1

26. The first step in translation is

A. binding of the two ribosomal subunits to each other
B. binding of mRNA to the two ribosomal subunits
C. binding of tRNA to the small ribosomal subunit
D. binding of mRNA to the small ribosomal subunit

Correct Answer: D. binding of mRNA to the small ribosomal subunit

27. Which of the following amino acid starts all proteins synthesis?

A. Glycine
B. Proline
C. Thymine
D. Methionine

Correct Answer: D. Methionine

28. The growing polypeptide chain is released from the ribosomes when

A. a chain terminating codon is reached
B. a chain terminating tRNA binds to the ribosome
C. the 7-methyl guanosine cap is reached
D. the poly A tail is reached

Correct Answer: A. a chain terminating codon is reached

29. Which of the following RNAs bind to an amino acid?

A. mRNA
B. tRNA
C. rRNA
D. hnRNA

Correct Answer: B. tRNA

30. How many bases of nucleic acid determine a single amino acid?

A. Four
B. One
C. Two
D. Three

Correct Answer: D. Three

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