Which neurotransmitter functions to stimulate skeletal muscle contraction?
a. acetylcholine
b. epinephrine
c. dopamine
d. serotonin
e. GABA
ANSWER: a
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In which category of media would MacConkey agar best fit?
a. Selective b. Differential c. Selective and differential d. Supportive only
A patient received bone marrow modified by an adeno-associated virus (AAV) carrying a human gene that encodes an enzyme her body could not make. This is an example of
A) protein therapy. B) germline gene therapy. C) somatic gene therapy. D) retroviral gene therapy.
An example of a one-way relationship in which one species benefits and another is directly hurt is ____
a. commensalism b. mutualism c. interspecific competition d. scramble competition e. parasitism
Which of the following sequences correctly represents the phytochrome signal transduction pathway?
a. red light ? PIF3 activation ? PIF3 into nucleus ? light-responsive gene switched off b. red light ? Pfr to Pr ? Pr into nucleus ? Pr-PIF3 complex ? light-responsive gene regulation c. UV light ? PIF3 into nucleus ? light responsive gene produces phytochrome ? Pr to Pfr d. blue light ? Pfr into nucleus ? Pfr-PIF3 complex ? light-responsive gene regulation e. red light ? Pr to Pfr ? Pfr into nucleus ? Pfr-PIF3 complex ? light-responsive gene regulation