Which ion channel is primarily responsible for the action potential?
A. The voltage-gated potassium channel
B. The non-gated sodium channel
C. The voltage-gated sodium channel
D. The ligand-gated sodium channel
E. The ligand-gated potassium channel
Answer: C
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Which of the following statements is false with regard to G-protein coupled receptors (GPCRs)?
A) GPCRs can interact with specific receptor interacting proteins to modify ligand affinity. B) Adenylate cyclase is activated. C) Phosphodiesterase creates v cAMP molecules in response to moderate cAMP levels. D) Protein Kinase A is activated by cAMP. E) cAMP signals for its own degradation indirectly.
If a microbiologist is studying a specimen at a total magnification of 950X, what is the magnifying power of the objective lens if the ocular lens is 10X?
A. 95X B. 940X C. 950X D. 9500X
Of all organisms, prokaryotes are
a. the smallest. b. the most abundant. c. the most metabolically diverse. d. the most widespread. e. all of these.
In a chromosomal inversion a segment of a chromosome is:
a. reversed. b. duplicated. c. lost. d. attached to a nonhomologous chromosome. e. deleted