Which of the following events occurs directly after a DNA molecule is unzipped?
A.) Mismatched nucleotide bases are identified and replaced.
B.) Free-floating nucleotides pair up with exposed bases.
C.) Identical double-stranded DNA molecules are formed.
D.) Enzymes break hydrogen bonds between base pairs.
Answer: B.) Free-floating nucleotides pair up with exposed bases.
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Amylase has specific active sites for which type of molecule?
a. carbohydrates b. proteins c. lipids d. amino acids
A molecule's behavior can be significantly modified by simply altering a functional group; for example, replacing a carboxyl group with a(n) ________ group will reduce a molecule's solubility in water
a. amine b. phosphate c. methyl d. hydroxyl
Variation in species richness of terrestrial species in North America correlates most strongly with estimates of
A) actual or potential evapotranspiration. B) annual temperature. C) solar radiation. D) precipitation.
Which of the following is NOT associated with a higher cancer risk?
a. hormone therapy b. safe sex c. smoking d. use of alcohol e. exposure to certain hazardous chemicals in the workplace