Each human kidney contains about a million ______________, which are the tubular functional units of the kidney.
A. ureters
B. nephrons
C. nephridia
D. flame cells
E. renal medullae
B. nephrons
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Crosses between a yellow rat and a yellow rat always produce yellow. Crosses between a white rat and
a white rat always produce white. The alleles affect the same aspect of coat color. The crosses of a white rat and a yellow rat produce cream. What happens if you cross two cream rats? What will be an ideal response?
Perhaps the most direct evidence for evolution comes from:a
biogeography. b. comparative anatomy. c. developmental biology. d. the fossil record. e. molecular biology.
Sound waves travel within the ear and cause hair cells of the organ of Corti to rub against the
__________, initiating nerve impulses to the brain. a. basement membrane b. basilar membrane c. tectorial membrane d. tympanic membrane e. plasma membrane
The membrane attack stage of the complement cascade involves
A. C1q binds to surface receptors on a membrane. B. cleaving of C3 to yield C3a and C3b. C. initiation of the cascade. D. production of inflammatory cytokines. E. the assembly of a ring-shaped protein that forms holes in bacterial cell membranes and virus envelopes.