Chapters 3 And 4: Macromolecules

BI108

QUIZ No2:

Chapters 3 & 4: Macromolecules

1. . The major carbohydrate-storage molecule in plants is: a. starch. b. cellulose. c. glycogen. d. deoxyribonucleic acid. e. maltose 2. The  helix is an example of which level of protein structure? a. Primary structure b. Quaternary structure c. Secondary structure d. Tertiary structure e. none of the above

3. The number of D-amino acids that occur naturally in proteins is: a. zero. b. 20. c. 19. d. 9. e. none of the above 4. In polysaccharides, sugars are linked together with _______ bonds. a. phosphodiester b. peptide c. glycosidic d. hydrophobic e. emotional 5. The major bonds in glycogen are _______ glycosidic bonds. a  b  c  d  e. none of the
Lipids release large amounts of energy when broken down. 12.. You look at the label on a container of shortening and see “hydrogenated vegetable oil.” This means that during processing the number of carbon–carbon double bonds in the oil was decreased. What is the result of decreasing the number of double bonds? a. The oil now has a lower melting point. b. The oil is now a solid at room temperature. c. There are more “kinks” in the fatty acid chains. d. The oil is now a derivative carbohydrate. e. The fatty acid is now a triglyceride. 13. The portion of a phospholipid that contains the phosphorous group has one or more electric charges. That makes this region of the molecule a. hydrophobic. b. hydrophilic. c. nonpolar. d. unsaturated. e. saturated. 14. Molecule X is soluble in ether, an organic solvent, but it is not very soluble in water. Based on this information, what class of biological macromolecules does molecule X belong to? a. Nucleic acids b. Carbohydrates c. Proteins d. Enzymes e. Lipids 15. In a biological membrane, the phospholipids are arranged with the fatty acid chains facing the interior of the membrane. As a result, the interior of the membrane is: a. hydrophobic. b. hydrophilic. c. charged. d. polar. e. filled with water. 16. The monomers that make up polymeric carbohydrates like starch are called: a. nucleotides. b. trisaccharides. c. monosaccharides. d. nucleosides. e. fatty
What portion of the polypeptide chain is responsible for establishing and maintaining the force that is used to stabilize secondary structure? a. b. c. d. e. C-terminus N- terminus Both a & c R-groups Carbonyl oxygens

24. How does the hydrogen bonding in alpha-helices differ from the hydrogen bonding in the beta strands of polypeptides? a. alpha bonding is parallel to the axis of the polypeptide b. alpha bonding utilizes R-groups c. beta bonding utilizes R-groups d. beta bonding utilizes only the N-terminus for hydrogen bonding e. none of the above 25. A slight change in the pH environment surrounding a protein could affect the proteins’: a. b. c. d. e. amino acid sequence overall shape overall structure function b, c, & d

26.. DNA and RNA contain: a. amyloses b. hexoses. c. fructoses. d. maltoses. e. pentoses. 27. Which of the following nitrogenous bases represent a pyrimidine? a. b. c. d. e. adenine cytosine guanine thymine