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

Biology & Microbiology

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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?  

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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

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Organelle for cellular respiration:

a. chloroplast b. vacuoles c. mitochondria

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Which antimicrobic does not inhibit cell wall synthesis?

A) Gentamicin B) Clavamox C) Penicillins D) Cephalosporins E) Vancomycin

Biology & Microbiology