Damaged or infected body cells are destroyed
by
a. helper T cells.
b. cytotoxic T cells.
c. dendritic cells.
d. antibodies.
e. active B cells
B
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In ____, one group of cells causes or influences another nearby group of cells to follow a particular developmental
pathway.
a. apoptosis b. induction c. differentiation d. determination e. cleavage
The concentration of solutes in most soil is lower than the concentration of solutes in root cells, so water enters the roots by
A. hydrostatic pressure. B. cohesion. C. osmosis. D. adhesion. E. hydrolysis.
When two species contain identical or nearly identical molecules such as proteins, this suggests
A) genetic modification has occurred to the populations. B) the two species share a common ancestry. C) the two species are in fact only one species displaying divergent evolution. D) the two species are in fact only one species displaying convergent evolution. E) the two species overlap in niches and likely share a common diet.
Usually the female is more discriminating than the male when it comes to mating. However, in bush crickets, the opposite is the case. Why is this?
a. Male bush crickets are prettier than female bush crickets. b. A male bush cricket must bring the female a large offering of food in order for the female to accept him as a mate. c. The male contributes a massive amount of energy to the female during mating—his ejaculate makes up about one-fourth of his body weight. d. Male bush crickets have tremendous variation in the desirability of their territories. e. Male bush crickets accept the newly fertilized zygotes from the female and incubate them.