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

Biology & Microbiology

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Crosses between a yellow rat and a yellow rat always produce yellow. Crosses between a white rat and

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Perhaps the most direct evidence for evolution comes from:a

biogeography. b. comparative anatomy. c. developmental biology. d. the fossil record. e. molecular biology.

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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

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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.

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