An immune response to a tissue graft will differ from an immune response to a bacterium because _____
A) MHC molecules of the donor may stimulate rejection of the graft tissue, but bacteria lack MHC molecules
B) the tissue graft, unlike the bacterium, is isolated from the circulation and will not enter into an immune response
C) a bacterium cannot escape the immune system by replicating inside normal body cells
D) the graft will stimulate an autoimmune response in the recipient
A
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a. sperm mother cells. b. spermatids. c. spermatogonial cells. d. primary spermatocytes. e. secondary spermatocytes.
In vertebrates, which heart chamber supplies oxygenated blood to the body cells?
A) Left ventricle B) Right ventricle C) Left atrium D) Right atrium
Hybridization regularly occurs between three species of Darwin's finches on Daphne Major, but the finches are still considered different species because
A. they occupy different niches. B. they are mechanically isolated. C. they are reproductively isolated. D. they have different fitnesses.
In allosteric regulation, effector molecules usually bind ________.
A. reversibly and noncovalently B. irreversibly and noncovalently C. irreversibly and covalently D. reversibly and covalently