Biology Ch 5

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Biology Ch 5
2013-03-17 13:12:03


Ch 5
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  1. What maintains the secondary structure of a protein?
    hydrogen bonds between the amino group of one peptide bond and the carboxyl group of another peptide bond
  2. Changing a single amino acid in a protein consisting of 325 amino acids would
    always alter the primary structure of the protein, sometimes alter the tertiary structure of the protein, and affect its biological activity
  3. Which of the following statements about the 5' end of a polynucleotide strand of DNA is correct?
    The 5' end has a phosphate group attached to the number 5 carbon of ribose.
  4. Large organic molecules are usually assembled by polymerization of a few kinds of simple subunits. Which of the following is an exception to this statement?
    a steroid
  5. On food packages, to what does the term insoluble fiber refer?
  6. What aspects of protein structure are stabilized or assisted by hydrogen bonds?
    secondary, tertiary, and quaternary structures, but not primary structure
  7. What type of covalent bond between amino acid side chains (R groups) functions in maintaining a polypeptide's specific three-dimensional shape?
    disulfide bond
  8. All of the following contain amino acids except
  9. Humans can digest starch but not cellulose because
    humans have enzymes that can hydrolyze the α glycosidic linkages of starch but not the β glycosidic linkages of cellulose.
  10. Dehydration reactions are used in forming which of the following compounds?
    triacylglycerides, polysaccharides, and proteins
  11. Which of the following is not a polymer?
  12. A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines. This DNA molecule could be composed of
    120 thymine and 120 adenine molecules.
  13. The label on a container of margarine lists "hydrogenated vegetable oil" as the major ingredient. What is the result of adding hydrogens to vegetable oil?
    The hydrogenated vegetable oil stays solid at room temperature.
  14. The tertiary structure of a protein is the
    unique three-dimensional shape of the fully folded polypeptide.
  15. What is the term used for a protein molecule that assists in the proper folding of other proteins?
  16. Which of the following best summarizes the relationship between dehydration reactions and hydrolysis?
    Dehydration reactions assemble polymers, and hydrolysis reactions break down polymers.
  17. Which of the following descriptions best fits the class of molecules known as nucleotides?
    a nitrogenous base, a phosphate group, and a pentose sugar
  18. If one strand of a DNA molecule has the sequence of bases 5'ATTGCA3', the other complementary strand would have the sequence
  19. Upon chemical analysis, a particular polypeptide was found to contain 100 amino acids. How many peptide bonds are present in this protein?
  20. There are 20 different amino acids. What makes one amino acid different from another?
    different side chains (R groups) attached to an α carbon