The sensor kinase for the OmpF: OmpC two-component regulatory system is
A. the MicF RNA.
B. the OmpK protein.
C. the EnvZ protein.
D. None of the choices are correct.
Answer: C
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Which of the following could be true if a plant cell is exposed to a toxin that makes the thylakoid membrane freely permeable to hydrogen ions?
What will be an ideal response?
All algae
a. are unicellular. b. are multicellular. c. have chlorophyll. d. are motile at all stages of their life cycle. e. have life cycles with alternating generations.
All mammals ________.
A. are ectothermic B. have mammary glands and hair C. are nocturnal D. give birth to live young
What is the difference between whole-chromosome aberrations and point mutations?
A) Point mutations affect a single base pair in the genome; aberrations affect a large section. B) Aberrations are not permanent changes in the DNA; point mutations are permanent. C) Point mutations are not permanent changes in the DNA; aberrations are permanent. D) Point mutations are the loss of parts of chromosomes; aberrations are the loss of whole chromosomes.