There are about __________ identified species of vertebrates
a. 2,000
b. 5,000
c. 30,000
d. 50,000
e. 125,000
D
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Metabolic channeling involves the localization of ________ in different parts of a cell in order to influence the activity of metabolic pathways.
A. repressors B. substrates and enzymes C. inhibitors D. activators
T cells that bind to the antigen-MHC complexes of
dendritic cells become activated and later a. produce antibodies. b. become NK cells. c. bind to B macrophages activating them. d. differentiate into helper T cells and memory T cells. e. activate complement
Most of the water vapor in the earth’s atmosphere
comes from evaporation from a. lakes. b. rivers. c. land. d. oceans. e. plants.
Which of the following have a periplasmic space?
A. Gram-negative bacteria only B. Gram-positive bacteria only C. both Gram-positive and Gram-negative bacteria D. archaea E. eukaryotes