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A chromosome is a cellular DNA molecule that typically encodes thousands of genes. In order for the information encoded within a specific gene to be transcribed to make RNA, RNA polymerase begins to transcribe the DNA, using one DNA strand as a template to make a complementary RNA molecule that is later used for protein synthesis during translation. A scientist is studying two mutant bacterial strains that do not produce a functional form of amylase, an enzyme that the organisms use to break down starch polymers. The scientist is using a third bacterial strain capable of normal amylase production (called the wild type) for comparison. Upon sequence analysis of the DNA region around and including the amylase gene in all three bacterial strains, the scientist locates the mutations as shown. Which statement BEST explains how these mutations affect gene expression and amylase enzyme functionality in the mutant bacterial strains?
A. Only mutant #1 transcribes the amylase gene and translate the resulting mRNA, but the resulting enzyme is non-functional
B. Only mutant #2 transcribes the amylase gene and translates the resulting mRNA, but resulting enzyme is non functional
C. Neither mutant #1 nor mutant #2 transcribes the amylase gene nor complete translation, so neither make functional enzymes
D. Both mutant #1 and mutant #2 transcribe the amylase gene and translate the resulting mRNA, but both resulting enzymes are non- functional.
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