Among the following substances contaminating Aberdeen Proving Ground in Maryland, which is an organic compound
that damages the nervous system, liver, and lungs?
a. lead
b. arsenic
c. dimethyl chloride
d. trichloroethylene
e. mercury
ANSWER: d
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Which of the following is not associated with salutatory propagation?
A. myelation B. nodes of Ranvier C. variable concentration of voltage-gated Na+ and K+ channels along the axon D. faster signal transmission E. extremely low threshold potential
Which organelle contains cristae where enzymes and electron carriers for aerobic respiration are found?
A. Lysosome B. Chloroplast C. Mitochondrion D. Golgi apparatus E. Endoplasmic reticulum
Which of the following is an example of a density-independent regulation?
a. parasites b. waste accumulation c. hurricanes d. predation
In the serological method for tissue typing, if human cells expressing HLA-I are mixed with anti-HLA-I, complement, and trypan blue, what would indicate the cells are HLA-I?
A) Enzyme is released from neutrophils. B) Cells are damaged by complement. C) Trypan blue enters the cells. D) Anti-HLA antibodies bind to HLAs on lymphocytes. E) None of the answers are correct; the T cells are missing.