Activation of C5-C9 results in
A) activation of C3.
B) fixation of complement.
C) lysis of microbial cells.
D) phagocytosis.
E) inflammation.
C
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What is the mechanism by which binding of testosterone to the testosterone receptor leads to upregulated gene transcription?
A. Binding of testosterone to the testosterone receptor leads to the increase in second messengers that activate a kinase cascade, ultimately leading to the activation of transcription factors that promote gene transcription. B. Binding of testosterone to the testosterone receptor leads to the activation of a G protein that stimulates the activation of enzymes that promote gene transcription. C. Binding of testosterone to the testosterone receptor leads to a conformational change that allows the receptor to enter the nucleus where it can bind to DNA and promote gene transcription. D. Binding of testosterone to the testosterone receptor leads to the opening of an ion channel that leads to an increase in calcium in the cytoplasm. The increased calcium levels activate calmodulin, which can go on to activate other proteins that promote gene transcription.
Saltatory conduction is the slowest form of action potential propagation
Indicate whether the statement is true or false.
Which of the following is true of a nanometer?
A) A nanometer is about the size of a common bacterial cell. B) A nanometer is one millionth of a meter. C) A nanometer is equivalent to 10 Angstroms (Å). D) The nanometer is the most common measurement used in measuring whole cells. E) none of the above
Mycetoma is a subcutaneous infection that involves the lower extremities but may also occur in any part of the body. Swelling, purplish discoloration, and tumorlike deformities of the subcuta-neous tissue are all symptoms associated with mycetoma. Which organism can cause this disease?
a. Bipolaris spp. b. Exserohilum spp. c. Pseudallescheria boydii d. Exophiala dermatitidis