Some human infants, especially those born prematurely, suffer serious respiratory failure because of _____
A) the sudden change from the uterine environment to the air
B) the overproduction of surfactants
C) the incomplete development of the lung surface
D) lung collapse due to inadequate production of surfactant
E) mutations in the genes involved in lung formation
Answer: D
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What happens to excess protein in the body?
A) It is broken down and excreted in urine. B) It is used as energy by muscles. C) It is stored as fat. D) It is used to build bone mass.
Under ideal conditions, some bacteria can reproduce as frequently as once every
A. thirty seconds. B. twenty minutes. C. twenty-four hours. D. three days.
Which of the following results in diploid cells?
a. gametogenesis b. mitosis c. meiosis d. spermatogenesis
Males tend to be affected in greater numbers by Xlinked
recessive genetic disorders than are females because a. females have two dominant genes for the disorder. b. males have only one X chromosome. c. males have a double dose of the gene. d. Y chromosomes are not as strong as X chromosomes. e. none of these.