Biochemistry - Protein Synthesis

Exercise :: Protein Synthesis - Section 1

  • Protein Synthesis - Section 1
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

Answer: Option A

Explanation:

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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

Answer: Option D

Explanation:

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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

Answer: Option D

Explanation:

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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

Answer: Option B

Explanation:

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15. 

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

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

Answer: Option C

Explanation:

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