Which of the following is required for the secretion of neurotransmitters in response to an action potential?
(a) neurotransmitter receptors
(b) Na+-K+ pumps
(c) voltage-gated K+ channels
(d) voltage-gated Ca2+ channels
(d) Voltage-gated Ca2+ channels open in response to the depolarization caused as the action potential moves toward the nerve terminal. The influx of calcium from outside the cell causes the synaptic vesicles to fuse with the plasma membrane and release large amounts of neurotransmitter into the synaptic cleft.
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Which cell junction type is responsible for allowing the bladder lining to stretch, thus accommodating increasing
volumes of urine?
a. anchoring junctions only b. gap junctions only c. tight junctions only d. both anchoring junctions and gap junctions e. both anchoring junctions, tight junctions and gap junctions
A bacterial gene (gene A) ordinarily makes a protein that binds to DNA. A mutation of gene A decreases the expression of another gene, gene B. We can conclude that:
A: gene A is a positive regulator of gene B. B: gene A is a negative regulator of gene B. C: gene B is a positive regulator of gene A. D: gene B is a negative regulator of gene A. E: genes A and B regulate one another.
Which structure is normally on the 5' end of a DNA strand?
A. nitrogenous base B. hydroxyl group C. sulfur group D. phosphate group
The pectoral girdle is composed of the ________, or shoulder blades, and the collarbones
Fill in the blank(s) with correct word