What is the name of the macromolecule that makes up the majority of the cell membrane?
A. nucleotide
B. lipid
C. carbohydrate
D. protein
B. lipid
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The body's non-inducible, preexisting ability to recognize and destroy pathogens or their products is called
A) adaptive immunity. B) innate immunity. C) phagocytosis. D) cytotoxic response.
If all conditions of Hardy–Weinberg equilibrium are met,
(a) allele frequencies move closer to each generation. (b) allele frequencies change in the direction predicted by natural selection. (c) allele frequencies stay the same. (d) all allele frequencies increase.
When a leaf is wounded, it releases jasmonic acid. What effect does jasmonic acid have?
a. It lowers the levels of ethylene and hydrogen peroxide. b. It triggers repair mechanisms within the plant. c. It triggers a death signal in plant cells near the wound. d. It increases transcription of genes whose products include a number of volatile chemicals that the plant releases into the air. e. It increases transcription of hundreds of genes whose products confer general hardiness to the plant.
The placental mammalian counterpart of Australia’s
spiny anteater is (are) the a. Tasmanian devil. b. aardvark. c. giant anteater. d. woolly lemur. e. aardvark and giant anteater.