An inflammatory condition of the respiratory system that results in intermittent wheezing and excess mucus production is called:
A) sinusitis.
B) asthma.
C) bronchitis.
D) emphysema.
Ans: B) asthma.
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Dwarf pea plants have deficient levels of the hormone gibberellin
Indicate whether the statement is true or false.
In mammals, the brain region that has become especially important as a "relay center" for information passing from sensory structures to the cerebrum is the
A. hypothalamus. B. cerebellum. C. pons. D. thalamus. E. hippocampus.
What happens to neurons in the approach known as optogenetics?
A) Mutations to ion channel proteins are corrected. B) The neurons are made to express light-sensitive ion channels. C) Neurotransmitter stores are depleted. D) Fusion of neurotransmitter vesicles to the presynaptic membrane is blocked. E) Leakage of cytoplasmic polyanions is blocked.
The human heart is composed of
A. an outer membranous sac called the pericardium. B. cardiac muscle fibers. C. muscle fibers called myocardium. D. endocardium. E. All of the choices are correct.