Phencyclidine (PCP) acts on receptors that normally respond to the neurotransmitter:
A) acetylcholine
B) dopamine
C) glutamate
D) serotonin
Answer: C) glutamate
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A nucleotide is constituted of
a. a five carbon sugar, a nitrogenous acid, and a phosphate group. b. a six carbon sugar, a nitrogenous base, and a phosphate group. c. a five carbon sugar, a nitrogenous base, and a phosphate group. d. a six carbon sugar, a nitrogenous acid, and a phosphate group. e. a four carbon sugar, a nitrogenous acid, and a phosphate group
Explain why “acid-fast” organisms are not usually visible when Gram stained. In other words, what biological property makes them resistant to Gram staining?
What will be an ideal response?
Which of the following pairs of structure are homologous?
A. wing of a dragonfly and wing of a hawk. B. wing of a dragonfly and forelimb of a flying squirrel. C. pectoral fin of a shark and front flipper of porpoise. D. forelimb of a dog and forelimb of a horse. E. wing of a bluejay and front flipper of a porpoise.
Gene regulation can involve a protein repressor that blocks _____ from initiating transcription.
A) DNA polymerase III B) RNA polymerase C) DNA polymerase I D) rRNA E) mRNA