Why doesn't every cell in the body respond to every hormone circulating in the bloodstream?
a. Each cell has a limited number of protein channels that shuttle hormones through its membrane.
b. Not all hormones can diffuse through all cell membranes.
c. The concentration of some hormones is too low to stimulate every cell.
d. Each cell has specific surface receptors, which interact only with hormones that they recognize.
e. Although all hormones bind to all cell surfaces, some cells lack second messengers for expression.
d
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Approximately what percentage of the human genome encodes proteins?
a. 1 b. 3 c. 5 d. 15 e. 50
Thyroxine, the primary hormone produced by the thyroid, contains what element?
a. selenium b. chromium c. vanadium d. iodine e. manganese
The cell formed through fertilization of an egg by a sperm is called a/an
A. gamete B. sperm cell C. zygote D. egg cell E. ovum
Which of the following statements is true of selective toxicity?
A. Selective toxicity takes advantage of structural similarities between host and pathogen. B. To be effective, an antimicrobial agent must be more toxic to the patient than the pathogen. C. Selective toxicity takes advantage of differences in metabolic rates of the host and pathogen. D. Selective toxicity damages only pathogenic bacteria and not beneficial bacteria. E. Selective toxicity takes advantage of structural and/or metabolic differences between host and pathogen.