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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

This stage follows Telophase I

What will be an ideal response?

Biology & Microbiology

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

Biology & Microbiology