During which months, in northern temperate zones, do plants begin the onset of dormancy?
a. April - June
b. March - July
c. February - April
d. December - January
e. September - October
e
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The excitatory signal generated by the cardiac
pacemaker spreads from fiber to fiber via
a. gap junctions. b. tight junctions. c. gated channels. d. desmosomes. e. sodium-potassium channels
Mutations in promoter regions of a gene are most likely to _____
a. prevent mRNA from being synthesized b. trap mRNA inside the nucleus c. prevent mRNA from being recognized by the ribosome d. prevent mRNA from being post-transcriptionally modified e. alter the amino acid sequence
The atom found in the greatest amount in the human
body is a. hydrogen. b. carbon. c. nitrogen. d. oxygen. e. phosphorus
All of the following are fuels produced by microorganisms EXCEPT
A) cellulose. B) ethanol. C) hydrogen. D) methane. E) oil from algae.