Protein Synthesis – Section 1

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  • / Author: GkFeed Team

11. The lac operon contains the z, y and a structural genes

A. encoding p-galactosidase, galactose permeases and thio-galactosidase transacetylase respectively
B. encoding p-galactosidase and galactose permeases
C. encoding P-galactosidase only
D. None of the above

Correct Answer: A. encoding p-galactosidase, galactose permeases and thio-galactosidase transacetylase respectively

12. Proteins contain __________ different amino acids, whereas DNA and RNA are composed of __________ different nucleotides

A. 20,64
B. 3,20
C. 4,20
D. 20,4

Correct Answer: D. 20,4

13. Which of the following is not necessary for protein synthesis to occur, once transcription is completed?

A. tRNA
B. Ribosomes
C. mRNA
D. DNA

Correct Answer: D. DNA

14. 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

Correct Answer: B. solely on the basis of their anticodons

15. Signal peptide protein removal that is translocated across a membrane is accomplished by

A. fMet aminopeptidase
B. trypsin
C. signal peptidase
D. chymotrypsin

Correct Answer: C. signal peptidase
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