What is a polypeptide?
A. polymers of amino acids
B. always composed of carbon rings
C. a main component of cellular membranes
D. hydrophilic
E. made from glycerol and fatty acids
Ans: A. polymers of amino acids
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When Darwin covered the tip of a grass seedling with metal foil and then illuminated it from one side, what happened to the seedling?
A. It bent away from the directional light. B. It did not respond to the directional light. C. It grew toward the light, as expected. D. It waved back and forth. E. It wilted and died.
The atmosphere performs several essential ecological functions. One of these is to:
a. protect Earth from all infrared radiation. b. reduce the amount of visible light reaching Earth c. provide plants with nitrogen needed for photosynthesis d. protect Earth from microwave radiation e. protect Earth from most ultraviolet radiation
Organelle for cellular respiration:
a. chloroplast b. vacuoles c. mitochondria
Which antimicrobic does not inhibit cell wall synthesis?
A) Gentamicin B) Clavamox C) Penicillins D) Cephalosporins E) Vancomycin