19) Enzymes that break down DNA catalyze the hydrolysis of the covalent bonds th

Question

19) Enzymes that break down DNA catalyze the hydrolysis of the covalent bonds that join the nugleotides together. What would happen to DNA molecules treated with these enzymes? polynucleotide chains. A The DNA double helix will come apart into 2 B. Proteins will break down into individual amino acids C. The phosphodiester linkages of the polynucleotide would break D. The pynimidines would be separated from the deoxyribose sugars E. All the bases would be separated from the deoxyribose sugars 20) A molecule that contains an amino group, a carboxyl group and a side chain is a A. monosaccharide B. disaccharide C. lipid D, nucleic acid E. amino acid 21) Which of the following are polymers? A. DNA B. purines C amino acids D. glycerol E. glucose 22) Which of the following is responsible for the alpha helix structure of proteins? A. hydrophobic interactions B. ionic bonds C. disulfide bonds D. hydrogen bonds formed between the amino acid backbones E. hydrogen bonds formed between the functional groups in the R-groups of amino acids 23) When two or more monosaccharides form a polysaccharide A water is lost B. CO2 is released. C. an amino group is added. D. O2 is required. E. a-COOH group is lost 24) Hydrolysis of starch results in the formation of A. water B. phospholipids C. amino acids D. glucose E. nucleotides 25) Which of the following is a lipid? A. steroid B. triglyceride C. phospholipid D. steroid and triglyceride are both lipids E. steroid, triglyceride and phospholipid are all lipids

Explanation / Answer

19. C. The phosphodiester linkages of the polynucleotide backbone would be broken.

20. E. amino acid

21. A. DNA

22. E. Hydrogen bonds formed between the functional groups in the R-groups of amino acids.

23. A. water is lost.

24. D. glucose

25. E. steroid, triglyceride and phospholipid are all lipids.

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