Has this cell undergone meiosis?
a. yes, because there are no duplicated chromosomes
b. no, because homologous chromosomes are present
c. yes, because homologous chromosomes are not present
d. no, because the diploid number is 2
B
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Disruption of neural signaling can produce profound changes in mood and behavior. Cocaine exerts its effects by
A. blocking norepinephrine and dopamine reuptake from synapses. B. blocking serotonin reuptake from synapses. C. preventing neurotransmitter vesicle fusion with presynaptic neuron membranes. D. blocking the enzyme acetylcholinesterase. E. binding to the GABA receptor to enhance inhibitory neurotransmission.
Z-form DNA is a ________ helix with ________ backbone.
A) right-handed; a smooth B) left-handed; a smooth C) right-handed; an irregular D) left-handed; an irregular
How are the membranes of animal cells in winter able to remain fluid when the weather becomes extremely cold?
a. The percentage of both unsaturated phospholipids and cholesterol increases. b. The percentage of saturated phospholipids in the membrane decreases. c. The percentage of unsaturated phospholipids in the membrane decreases. d. The percentage of cholesterol molecules in the membrane increases.
Scar formation is defined as:
a. primary union b. regeneration c. mitotic cellular repair d. fibrous connective tissue repair