Blood glucose levels are regulated by
a. insulin.
b. glucagon.
c. cortisol.
d. insulin and glucagon only.
e. insulin, glucagon, and cortisol.
Answer: e
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Media that can be used for the isolation of Mycoplasma include:
a. Thayer-Martin agar with vitamin K. b. 5% sheep blood and IsoVitaleX. c. beef or soybean protein with serum and fresh yeast extract. d. hemin and nicotina-mide-adenine-dinucleotide (NAD) sup-plements.
Allen's rule states that mammals from colder climates have shorter ears and appendages than individuals of the same species from warmer areas. The related Bergman's rule states that mammal body size varies with latitude, with larger body size in populations located closer to the poles and smaller body size in populations located closer to the equator. What can explain both of these rules?
A. Larger bodies can store proportionally more fat as insulation than smaller bodies. B. Smaller bodies can store proportionally more fat as insulation than larger bodies. C. Heat loss increases as the surface area to volume ratio of the animal increases. D. Larger bodies have a proportionally larger surface area, and heat radiation varies with volume. E. Smaller bodies have a proportionally smaller surface area, and heat radiation increases with surface area.
Transfer RNA(tRNA) functions in the process of ________________.
A. DNA replication. B. transcription. C. translation. D. none of these.
A nonfunctional CD4 protein on a helper T cell would result in the helper T cell being unable to _____
A) respond to T-independent antigens B) lyse tumor cells C) stimulate a cytotoxic T cell D) interact with a class II MHC-antigen complex