Which of the antibody classes is able to destroy an antigen by activating the nonspecific killing action of the natural killer cells?
A) IgM only
B) IgE only
C) IgG only
D) both IgG and IgM
E) both IgM and IgE
Ans: C) IgG only
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Which of the following would increase the rate of oxygen diffusion from the air into the body cells of a flatworm?
A. increasing the surface area of the body B. increasing the partial pressure of oxygen inside of the cells C. increasing the thickness of the body wall D. increasing the surface area of the body and the partial pressure of oxygen inside the cells E. All of the answer options are correct.
Which of the following is not true of the outer membrane?
A. Gram-positive bacteria have an outer membrane. B. The lipid portion of the lipopolysaccharide layer is termed endotoxin. C. Porins create channels through the outer membrane. D. The innermost layer is a phospholipid bilayer. E. The uppermost layer is made of lipopolysaccharide.
In mammals, which of the following aids in thermoregulation and communication?
a. Sudoriferous glands b. Sebaceous glands c. Cutaneous respiration d. Adrenal glands
The liver functions to do all of the following EXCEPT
a. produce bile. b. remove toxins ingested in food. c. inactivate hormones. d. process nutrients into required substances. e. produce glucagon.