What percentage of human DNA is devoted to coding exons?

a. 1%
b. 1.5%
c. 25%
d. 50%
e. 100%


ANSWER: b

Biology & Microbiology

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Enzymes are

A. not needed for catabolic reactions. B. proteins that function as catalysts. C. used up in chemical reactions. D. carbohydrate or protein in composition. E. broken down in reactions that require energy input.

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The active site of an enzyme ____

a. is where the coenzyme is located b. is a specific bulge or protuberance on an enzyme c. is a groove or crevice in the structure of the enzyme complementary to the substrate d. will react with only one substrate no matter how many molecules may resemble the shape of the substrate e. rigidly resists any alteration of its shape

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The surface area of all the alveoli in the lungs is

equivalent to the surface of a regulation __________ court. a. tennis b. basketball c. racquetball d. jai lai e. all of these combined

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According to the second law of thermodynamics, energy cannot be created nor destroyed

__________________ Indicate whether the statement is true or false.

Biology & Microbiology