Microbiology with Diseases by Taxonomy Study Set 1
Quiz 7 :
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Q22 Q22 Q22
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?
Q30 Q30 Q30
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 phenotypic variant of the organism is TTACCATATTCACCC and the peptide sequence is Leu- Pro- Cys- Ser- Pro. This is an example of a mutation (type) resulting in a mutation (effect).
Q70 Q70 Q70
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.