The maintenance of the volume and composition of body fluids is the direct responsibility of which
system?
a. integumentary
b. immune
c. digestive
d. urinary
e. circulatory
D
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Recall the experiment on ant navigation. To run a controlled experiment, what parameters were held constant for the test group of 75 ants?
A) stride number B) leg length C) stride number, leg length, and environmental temperature D) all variables except leg length
Some species of insects are able to walk across liquid water because of the:
A. high specific heat of water B. low gravitational effect of their body weight relative to the amount of water C. higher density of liquid water compared to solid water D. capacity of water to function as a solvent E. high surface tension of water due to its cohesion
The methylation state of an individual CpG island:
A. is fixed; such genes are permanently turned off. B. is fixed, but this has no effect on whether genes are expressed. C. is randomâ€"sometimes the cytosines are methylated and sometimes they're not, but the state is independent of the environment or cell type. D. can change over time in response to environmental cues, allowing genes to be turned on or off as needed. E. can change over time in response to environmental cues, but this has no effect on gene expression.
What cytokine is secreted by helper T cells, and stimulates proliferation of helper T cells and cytotoxic T cells, proliferation and differentiation of B cells, and enhances the activity of natural killer cells?
A) interferon-1 B) interferon-2 C) interleukin-10 D) interleukin-4 E) interleukin-5