Which of the following statements is true regarding anammox?
A. It can be carried out by both eukaryotes
and archaeons.
B. It generates less energy compared to
respiration.
C. It is performed in oxygen-rich
environments.
D. It is identical to nitrogen fixation.
E. All of these answer options are correct.
B
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Muscle contraction is regulated by:
A. depletion of acetylcholine, which returns the ligand-gated ion channel to the resting, closed conformation, preventing further transport of sodium ions. B. an ATP-powered sodium pump in the plasma membrane that continuously works to set up a sodium concentration gradient. C. an enzyme that degrades and removes acetylcholine from the neuromuscular junction. D. the resting neuron that does not release acetylcholine into the neuromuscular junction. E. All of these choices are correct.
Genetically modified organisms include ________.
A. plants B. bacteria C. nonhuman animals D. viruses E. All of the above have been genetically modified.
Transcription factors bind to _____
a. promoters b. stop codons c. start codons d. poly-A tails e. introns
Among the protist groups below, which has organisms that typically move with two or more flagella?
a. actinopods b. amoebozoa c. diplomonads d. foraminifera e. apicomplexans