One difference between the ion channel-linked receptors for GABA and acetylcholine is that when
GABA binds its receptor:a.
muscle contraction is inhibited.
b. sodium ions enter the cell.
c. muscle contraction is stimulated.
d. neural signaling is inhibited.
e. chloride ions rush out of the neuron.
D
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Which component is NOT found in a chloroplast?
a. a single outer membrane b. DNA c. ribosomes d. stroma e. thylakoids
The specimen preparation that is best for viewing cell motility is
A. fixed-stained smear. B. hanging drop. C. flagellar stain. D. Gram stain. E. negative stain.
Coconut milk has been used to promote the differentiation of organs in masses of plant tissue growing in culture. Coconut milk is effective for this reason because it contains
A. cytokinins. B. abscisic acid. C. gibberellins. D. auxins. E. ethylene.
Which type of crossover event produces no recombinant chromosomes?
A) single-strand crossover B) two-strand double crossover C) three-strand double crossover D) four-strand double crossover E) None of the above; all crossover events produce recombinant chromosomes.