1. Given the CODING strand 5\'-ATG ACT CGT TGT TGA-3\', if there is a transition

Question

1. Given the CODING strand 5'-ATG ACT CGT TGT TGA-3', if there is a transition point mutation at the ninth position, what amino acid does the does the third triplet code for?
A) Gly
B) Arg
C) Cys
D) Thr

2.
Given the CODING strand 5'-ATG ACT CGT TGT TGA-3', which amino acid does the third triplet code for?
A) Cys
B) Arg
C) Thr
D) Gly

3.
Why are silent mutations possible?
A) Because forward mutations are always paired with reversions.
B) Because of the redundancy of the genetic code.
C) Because a certain triplet can code for more than one amino acid.

4.
Given the CODING strand 5'-ATG ACT CGT TGT TGA-3', if there is a transition point mutation at the seventh position, what amino acid does the does the third triplet code for?
A) Gly
B) Arg
C) Cys
D) Thr

5.
Weedy plants that are resistant to the herbicide atrazine have a single nucleotide substitution in the gene psbA that results in the replacement of a serine with an alanine in the polypeptide. What type of mutation is this?
A) Nonsense
B) Silent
C) Transversion
D) Transition

Explanation / Answer

1)C) Cys 2)A) Cys 3)B) Because of the redundancy of the genetic code. 4)B) Arg 5)C) Transversion

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