While characterizing the activities of several neurons, you find a neuron with the following properties:
(1) When stimulated, the neuron fails to release neurotransmitters into the synaptic cleft.
(2) Microinjection of calcium ions calcium ions has no effect on the neuron. (In other neurons such microinjection stimulates the t-SNARE and v-SNARE complex interaction that promotes neurotransmitter secretion.)
The abnormality in this neuron is most likely associated with the function of
A) the vesicle membranes.
B) acetylcholinesterase.
C) synaptotagmin.
D) GABA receptors.
E) gap junctions.
Answer: C
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Changing a single amino acid in a protein consisting of 325 amino acids would _____
A) alter the primary structure of the protein but not its tertiary structure or function B) cause the tertiary structure of the protein to unfold C) always alter the biological activity or function of the protein D) always alter the secondary structure of the protein and disrupt its biological activity E) always alter the primary structure of the protein, sometimes alter the tertiary structure of the protein, and sometimes affect its biological activity
What wavelengths of light should be used to maximize plant growth with a minimum of energy expenditure?
A) full-spectrum white light B) green light C) a mixture of blue and red light D) yellow light E) UV light
A molecule of a saturated triacylglycerol contains:a
the maximum number of double bonds between carbons in the fatty acid chains. b. the maximum number of triple bonds between carbons in the fatty acid chains. c. the maximum number of hydrogen atoms in the fatty acid chains. d. fatty acid chains with both amino and carboxyl groups. e. alternating single and double bonds between carbons in the fatty acid chains
The cells of the nervous system that transmit nervous system messages are the:
A) neurons. B) synapses. C) glial cells. D) dendrites.