A graded, subthreshold change in the postsynaptic membrane potential that moves it toward threshold
is called a(n)
a. IPSP.
b. hyperpolarization.
c. EPSP.
d. depolarization.
e. repolarization.
C
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Which of the following causes DNA to wrap tightly
around histones essentially preventing transcription? a. methylation b. acetyl CoA c. nitrogenation d. dehydration e. carbonation
Biologists identify __________, which are larger
regions characterized by their physical characteristics as well as the species in them. Fill in the blank(s) with the appropriate word(s).
What primarily determines the shape of animal cells, which lack cell walls?
A) Ribosomes B) Cytoskeleton C) Nucleus D) Cytoplasm E) Endoplasmic reticulum
The giant tube worms (Riftia) found at hydrothermal vents form a symbiotic relationship with
a. fungi. b. sulfur-oxidizing bacteria. c. cyanobacteria. d. nitrogen-fixing bacteria.