Class I MHC genes code for
A. certain secreted complement components.
B. receptors located primarily on macrophages and B cells.
C. self receptors recognized by T lymphocytes.
D. all HLA antigens.
Answer: C
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a. a dorsal nerve cord b. a postanal tail c. an internal backbone d. a notochord
Which organ system includes the spleen, lymph nodes, and thymus?
a. circulatory system b. endocrine system c. nervous system d. digestive system e. lymphatic system
The _____ are erectile tissues which lie close to the crura of the clitoris, and are about the size and shape of a pea pod.
A. fallopian tubes B. seminiferous tubules C. vestibular bulbs D. vasa deferentia
Conservation biology supports all of the following ethical principles except
a. the complex interactions of ecosystems support biodiversity and are desirable. b. all animals have the same rights or legal status as humans. c. biodiversity has value in and of itself regardless of any practical benefit to humans. d. biodiversity is desirable for the biosphere and humans. e. extinction due to human actions are undesirable.