Mutation of Enzyme 1 Enzyme 2 Gene A + 0 Gene B 0 + Gene C 0 0 Gene D C C a. The
ID: 5386 • Letter: M
Question
Mutation of
Enzyme 1
Enzyme 2
Gene A
+
0
Gene B
0
+
Gene C
0
0
Gene D
C
C
a. The genes are adjacent, inthe order A B C D. Which gene is most likely to be thestructural gene for enzyme 1?
b. From all the evidencegiven, determine whether the following statements are true orfalse:
i. It is possible that gene D is astructural gene for one of the two enzymes.
ii. It is possible that gene Dproduces a repressor.
iii. It is possible that gene Dproduces a cytoplasmic product required to induce production ofenzymes 1 and 2.
iv. It is possible that gene D isan operator locus for the sug operon.
v. It is possible that gene Ccould be a gene that produces a cytoplasmic factor that is requiredto induce enzymes 1 and 2.
Mutation of
Enzyme 1
Enzyme 2
Gene A
+
0
Gene B
0
+
Gene C
0
0
Gene D
C
C
Explanation / Answer
a. gene B seems to be structural gene for enzyme 1 as when it gotmutated it showed the deleterious efect of absence of enzyme 1. b. i. no its flase. it cant be used for inducing the productof enzyme 1. ii. yes true. very much possible that gene D produces arepressor iii. yes true iv. gene D cannot be a operon locus. operon locus are constitutedby gene A or B. v. highly impossible
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