Biology Ch 5 Study Guide
In a hydrolysis reaction, ______, and in this process water is _____. A. monomers are assembled to produce a polymer...produced B. monomers are assembled to produce a polymer...consumed C. a polymer is broken up into its constituent monomers...consumed D. a monomore is broken up into its constituent polymers...produced E. a polymer is broken up into its constituent monomers...produced
C
The enzyme amylase can break glycosidic linkages between glucose monomers only if the monomers are in the a form. Which of the following could amylase break down? A. starch and chitin B. starch, amylopectin, and cellulose C. glycogen, starch, and amylopectin D. glycogen and cellulose E. cellulose and chitin
C
The molecular formula for glucose is C6H12O6. What would be the molecular formula for a polymer made by linking ten glucose molecules together by dehydration reactions? A. C6H12O6 B. C60H120O60 C. C60H102O51 D. C60H111O51 E. C60H100O50
C
The structural level of a protein least affected by a disruption in hydrogen bonding is the A. quaternary level B. secondary level C. all levels are equally affected D. primary level E. tertiary level
D
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'-GCGC-3' with 5'-TATA-3' C. 5'-AGCT-3' with 5'-TCGA-3' D. 5'-ATCG-3' with 5'-GCAT-3' E. all these pairs are correct
D
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 pyrimidines would be separated from the deoxyribose sugars B. the two strands of the double helix would separate C. all bases would be separated from the deoxyribose sugars D. the purines would be separated from the deoxyribose sugars E. the phosphodiester linkages of the polynucleotide backbone would be broken
E
In what polysaccharide form do plants store glucose to be available later as an energy source? A. fatty acids B. glycogen C. protein D. cellulose E. starch
E
Which of the following statements concerning unsaturated fats is true? A. they have fewer fatty acid molecules per fat molecule B. they are more common in animals than in plants C. they contain more hydrogen than do saturated fats having the same number of carbon atoms D. they generally solidify at room temperature E. they have double bonds in the carbon chains of their fatty acids
E
Generally, animals cannot digest (hydrolyze) the glycosidic linkages between the glucose molecules in cellulose. How then do cows get enough nutrients from eating grass?
Microorganisms in their digestive tracts hydrolyze the cellulose to individual glucose units
One characteristic shared by sucrose, lactose, and maltose is that __________.
they are all disaccharies
Which of the following categories includes all others in the list? A. carbohydrate B. starch C. disaccharide D. polysaccharide E. monosaccharide
A. Carbohydrate
Amylase is an enzyme that breaks down starch. Why cannot the same enzyme break down cellulose? A. the monosaccharide monomers in cellulose are bonded together differently than those in starch B. the bonds between monosaccharide monomers in cellulose are much stronger C. the enzyme cannot attack cellulose because of its helical shape D. cellulose molecules are much too large E. starch is made of glucose; cellulose is made of fructose
A; The glucose monomers in cellulose are bonded in a β glycosidic linkage, whereas those in starch have an α glycosidic linkage. The enzyme amylase is specific for the α glycosidic linkage
