Cells use membranes to help maintain set ranges of ion concentrations inside and outside the cell. Which of the following ions is the most abundant outside a typical mammalian cell?

(a) Na+
(b) K+
(c) Ca2+
(d) Cl–


(a)

Biology & Microbiology

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Which of the following diseases is a synonym for ringworm infection of the nails?

A) tinea barbae B) tinea cruris C) tinea nigra D) tinea unguium

Biology & Microbiology

Male sticklebacks that see a model of a fish with a red belly will attack it, thinking it is a breeding male. They do not attack model fish without a red belly. This is an example of

A. learned behavior. B. imprinting. C. fixed action pattern. D. taxis. E. reflex.

Biology & Microbiology

Which of the following statements is false?

a. Whales use their jaws to hear. b. Whales lack a pair of middle ears. c. Killer whales use echolocation and have ears that are sensitive to high-frequency sounds. d. Humpback whales emit very low-pitched sounds that travel long distances underwater. e. Sound waves are transmitted through a layer of fat before being transduced in whales.

Biology & Microbiology

A healthy male will release ____ sperms during one ejaculation. 

A. 300 B. 3,000 C. 30,000 D. 300,000,000  

Biology & Microbiology