The resistance to reinfection with measles virus following recovery from measles infection is called __________.

A) artificial immunity
B) natural selection
C) passive immunity
D) innate immunity
E) active immunity


Ans: E) active immunity

Biology & Microbiology

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Cactus leaves are modified as trichomes

a. True b. False

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What is the difference between an estuary and a salt marsh?

a. Salt marshes are found far from the ocean, while estuaries border the ocean. b. Salt marshes are not affected by tides, while estuaries are. c. Salt marshes are dominated by grasses, while estuaries are defined by tidal influence. d. Salt marshes border the ocean, while estuaries exist in river environments. e. Salt marshes are affected by tides, while estuaries are not.

Biology & Microbiology

Approximately how many genes do humans

have?

a. 10,000 b. 20,000 c. 50,000 d. 100,000 e. 1,000,000

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What is the definition of osmosis?

A) The movement of molecules down their concentration gradient B) The movement of salt molecules across a semipermeable membrane C) The diffusion of water molecules across a semipermeable membrane D) The movement of molecules against their concentration gradient

Biology & Microbiology