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A normal bacterial cell carries out the chemical reaction represented in the diagram.
image
A certain mutant bacterial cell cannot produce substance B. The mutation was most likely the result of a change in the
A.
ability of the DNA to replicate.
B.
ribosome in which enzyme X is made.
C.
amino acid sequence of RNA.
D.
gene that codes for enzyme X.
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Answered by
GPT-5 mini
AI
D
If the mutant can't make substance B, the likely problem is that enzyme X (which catalyzes the step to B) is missing or nonfunctional. That would result from a mutation in the gene that codes for enzyme X, altering the protein sequence or expression. The other choices are incorrect: a DNA replication defect wouldn't specifically block B production, ribosome defects would affect many proteins, and RNA does not have an "amino acid sequence."
If the mutant can't make substance B, the likely problem is that enzyme X (which catalyzes the step to B) is missing or nonfunctional. That would result from a mutation in the gene that codes for enzyme X, altering the protein sequence or expression. The other choices are incorrect: a DNA replication defect wouldn't specifically block B production, ribosome defects would affect many proteins, and RNA does not have an "amino acid sequence."
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