A) Change the secondary and tertiary structures of a protein. B) Have no effect

Question

A) Change the secondary and tertiary structures of a protein. B) Have no effect on the amino acid sequence of the protein. C) Lead to the formation of double-stranded proteins. D) Lead to a breakdown of transcription. E) None of the above 45) A silent mutation will.. A) Change the reading frame of the gene. B) Lead to the production of a less effective protein. C) Have no effect on the structure of a protein. D) Lead to the production of an incomplete protein. E) None of the above 46) Which of the following statements is/are true for the Ames test? A) It involves the use of a histidine auxotrophic strain of Salmonella B) It depends on an event called a reversion. C) It may involve treatment of the test chemical with rat liver enzymes. D) All of the above E) A and C

Explanation / Answer

Ans44: A

Frameshift mutation changes the reading sequence of codons by shifting the codon reading frame. This results into changed amino acid sequence and thus altered protein. Altered amino acid sequence changes secondary and hence tertiary structure.

Thus correct choice should be (A)_change the secondary and tertiary structure of protein.

Ans45- (c) no effect on the structure of protein

Ans46- (D) all {i.e. histidine, reversion, test chemicals}

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