In a parasitic relationship where the host contracts a disease and sometimes dies, the parasite is called:a
a predator.
b. a keystone species.
c. a mutualistic symbiont.
d. an interspecific competitor.
e. a pathogen.
E
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Acetylcholine is a neurotransmitter released by motor neurons that causes skeletal muscle fibers to relax.
a. true b. false
If meiosis did not precede fertilization, what would happen to the chromosome number after each generation?
A. It would be half of the parents’ chromosome number. B. It would be two times the parents’ chromosome number. C. It would be four times the parents’ chromosome number. D. It would be eight times the parents’ chromosome number. E. It would remain the same.
Which is not a step in the process of B cell activation by a T-dependent antigen?
A) binding of the antigen to the B cell receptor B) binding of the antigen to a T helper cell receptor C) interaction between co-stimulatory proteins on the B and T cells D) release of cytokines by the T helper cell provide the second activation signal for the B cell E) processing and displaying the antigen with MHC II on the B cell
When blood glucose levels decrease (as between meals), what reserves are tapped first?
a. glycogen b. fats c. proteins d. steroids e. amino acids