The action of a white blood cell engulfing a
bacterium is
a. pinocytosis.
b. phagocytosis.
c. exocytosis.
d. endocytosis.
e. phagocytosis and endocytosis.
Answer: e
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Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all. A cross between a true-breeding sharp-spined cactus and a spineless cactus would produce_____.
A) all sharp-spined progeny B) 50% sharp-spined, 50% dull-spined progeny C) 25% sharp-spined, 50% dull-spined, 25% spineless progeny D) all spineless progeny E) It is impossible to determine the phenotypes of the progeny.
Plants and animals that rely on diffusion to move molecules through their bodies tend to ________
a. be large b. have respiratory and vascular systems c. be small and flat d. evolve few adaptations because diffusion is a passive process
This stage follows Telophase I
What will be an ideal response?
In which location would the partial pressure of oxygen be the lowest?
a. inhaled air b. exhaled air c. alveoli d. pulmonary veins e. pulmonary arteries