Microbiology Study Set 2
Quiz 7 :
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Q16 Q16 Q16
A wild-type organism and a genetic variant both have a gene encoding a receptor producing a chemotactic response to metabolite A. The genetic variant has a mutation in a regulatory gene for expression of the receptor. Which of the following statements with respect to the receptor is CORRECT?
Q34 Q34 Q34
The DNA sequence of a portion of gene in a wild-type organism is TTACCATATTCACCC, and the corresponding peptide sequence is Leu-Pro-Tyr-Ser-Pro. The corresponding gene fragment in a phenotypic variant of the organism is TTACCATATTCACCC and the peptide sequence is Leu-Pro-Cys-Ser-Pro. This is an example of a(n) mutation (type) resulting in a Mutation (effect).
Q47 Q47 Q47
A chemical is reported to inhibit bacterial replication. Bacterial cells are placed in medium with all nutrients necessary for replication. The chemical is added to the culture, and after a half hour an extract of the DNA is prepared. A significant percentage of the DNA is in pieces about 1000 to 2000 bases in length. The results are consistent with the chemical blocking the function of DNA ligase.
Q72 Q72 Q72
Hepatitis C and other viruses with RNA genomes have higher mutation rates than viruses with DNA genomes. Based on information up to this point in the text suggest some possible explanations for the higher mutation rates. (You may also want to consider information in chapter 2, chemistry.)