Which is false regarding the two-component regulatory system in bacteria?
A. One part of the system is exposed to the external cellular environment while another part is exposed to the cytoplasm.
B. The system involves a sensor kinase and a response regulator.
C. The sensor kinase is phosphorylated by the response regulator when the extracellular environment changes.
D. Regulation of OmpF and OmpC porin proteins in E. coli is modulated by this type of system.
Answer: C
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What would result from a single nucleotide deletion (point mutation) within the coding sequence of a structural gene?
A. a silent point mutation with no deleterious effects B. a missense point mutation resulting in the change of one amino acid C. a nonsense point mutation resulting in the generation of a premature stop codon D. a frameshift mutation, producing a different amino acid sequence altogether E. All of the choices are possible.
Disease(s) in which the causative agent becomes latent is/are
A. cold sores. B. genital herpes. C. shingles. D. All of the choices are correct.
All of the following statements about telomeres and telomerase are true EXCEPT that ________
A) telomeres shorten as cells age (senescence) B) telomerase minimizes telomere shortening C) telomerase activity is high in adult cells D) telomerase activity is high in embryonic stem cells E) None of these choices
What is the currently recognized classification scheme?
A) two-kingdom system B) five-kingdom system C) biogeography D) three-domain system