Biology Chapter 5

The enzyme amylase can break glycosidic linkages between glucose monomers only if the monomers are in the alpha form. Which of the following could amaylase break down? a. glycogen, starch, and amylopectin b. glycogen and cellulose c. cellutose and chitin d. starch and chitin e. starch, amylopectin, and cellulose

a. glycogen, starch, and amylopectin

The structural level of a protein least affected by a disruption in hydrogen bonding is the a. primary level b. secondary level c. tertiary level d. quaternary level e. all structural levels are equally affected

a. primary level

Enzymes that break down DNA catalyze the hydrolysis of the covalent bonds that join nucleotides together. What would happen to DNA molecules treated with these enzymes? a. the two strands of the double helix would separate b. the phosphodiester linkages of the polynucleotide backbone would be broken c. the purines would be separated from the deoxyribose sugars d. the pyrimidines would be separated from the deoxyribose sugars e. all bases would be separated from the deoxyribose sugars

a. the two strands of the double helix would separate

Which of the following statements concerning unsaturated fats is true? a. they are more common in animals than i plants b. they have double bonds in the carbon chains of their fatty acids c. they generally solidify at room temperature d. they contain more hydrogen than do saturated fats having the same number of carbon atoms e. they have fewer fatty acid molecules per fat molecule

b. they have double bonds in the carbon chains of their fatty acids

The molecular fromula for glucose is C6H12O6. What would be the molecular formula for a polymer made by linking ten glucose molecules together by dehydration reactions? a. C60H120O60 b. C6H12O6 c.C60H102O51 d. C60H100O51 e. all of these pairs are correct

c.C60H102O51

Which of the following categories includes all others in the list? a. monosaccharide b. disaccharide c. starch d. carbohydrate e. polysaccharide

d. carbohydrate

Which of the following pairs of base sequences could form a short stretch of a normal double helix of DNA? a. 5'-purine-pyrimidine-purine-pyrimidine-3' with '3 purine-pyrimidine-purine-pyrimidine-5' b. 5'-AGCT-3' with 5'-TCGA-3' c. 5'-GCGC-3' with 5'-TATA-3' d. 5'-ATGC-3' with 5'-GCAT-3' e. all of these pairs are correct

d.5'-ATGC-3' with 5'-GCAT-3'