Which of the following is the primary function of
pollen grain coats?
a. differentiates upon contact with the flower
b. protects from harsh chemicals and dehydration
c. prevents competing pollen grains from being
able to fertilize a flower
d. provides an aerodynamic structure to allow them
to travel on wind currents
e. none of these
Answer: b
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One feature shared by modern humans and
lacking in other Homo species is
a. a chin. b. a large brain. c. bipedalism. d. tool making. e. legs longer than arms
Neuroglial cells do all of the following EXCEPT
a. metabolically support other neurons. b. form sheaths around neurons and control the rate of impulse transmission. c. form more than half of the volume of the brain. d. provide physical support. e. conduct action potentials.
Which of the following does not result from the combination of antibodies and antigens?
a. inactivation of the pathogen b. formation of cytotoxic T cells c. stimulation of phagocytosis d. inactivation of toxins e. activation of the complement system
Growth that results in an increase in the length of a plant is referred to as:
a. horizontal growth. b. longitudinal growth. c. primary growth. d. radial growth. e. secondary growth.