Which one of the following happens during repolarization of a neuron?
A) Sodium channels close, and potassium rushes out of the cell to temporarily reestablish the membrane potential.
B) Potassium channels close, preventing further loss of positive ions.
C) The sodium-potassium pump is turned off.
D) Sodium channels open to allow sodium ions to rush back out of the cell.
E) The membrane potential is eliminated.
A
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True or false: In the sequence AGGCCT, an available phosphate group would be found at the 5' end of the nucleotide labeled "T."
A. true B. false
V-________ and t-________ mediate final docking between target and vesicle.
Fill in the blank(s) with the appropriate word(s).
Which method of reproduction posed a challenge for clam and oyster fishery workers who thought that cutting predatory sea stars into parts would kill them, but only increased the number of sea stars?
a. Fragmentation b. Fusion c. Budding d. Fission
The anterior and posterior pituitary glands differ in that ____
a. the anterior pituitary produces peptide hormones while the posterior pituitary produces steroid hormones b. the anterior pituitary produces its own hormones but the posterior pituitary does not c. the anterior pituitary is a part of the nervous system; the posterior pituitary is a part of the endocrine system d. the anterior pituitary is controlled by the hypothalamus whereas the posterior pituitary is controlled by the adrenal cortex e. the anterior pituitary is under voluntary control; the posterior pituitary is under involuntary control