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19 Cards in this Set
- Front
- Back
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1. Which of the following statements is true?
a. a polar covalent bond is weaker than an ionic bond b. an ionic bond is stronger than a nonpolar covalent bond c. the existence of nonpolar covalent bonds makes hydrogen bonding possible d. all of the above e. none of the above |
e
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2. The four of the most common elements in biological molecules include:
a. carbon, oxygen, hydrogen and silicon b. carbon, oxygen, hydrogen and chlorine c. carbon, oxygen, hydrogen and nitrogen d. carbon, oxygen, nitrogen and calcium e. none of the above |
c
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3. Which of the following statements about pH are true?
a. The concentration of hydrogen ions in a solution with a pH=3 is 10-3 M b. Acids decrease pH by increasing the concentration of hydrogen ions. c. The concentration of hydrogen ions in a solution with a pH=3 is 103 M. d. both a and b e. none of the above |
d
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4. Denaturation of a protein occurs when
a. two amino acids are joined by a peptide bond b. disulfide bridges form between cysteines c. a protein is exposed to chemicals that stabilize hydrogen bonds d. all of the above e. none of the above |
e
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5. Alpha helices
a. are found in polysaccharides b. are found in proteins c. are formed by hydrogen bonding d. b and c e. a and c |
d
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6. Which of the following statements about pH are true?
a. the pH of a 1 mM solution of HCl is 3 b. the pH of pure water is 6 c. the concentration of H+ increases two fold as the pH of a solution drops from 6 to 3. d. a and b e. a and c |
a
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7. Polar covalent bonds result from
a. differences in the electronegativity of the bonding partners b. the influence of the water solvent on biological molecules c. van der Waals forces d. bonding to hydrogen e. bonding to carbon |
a
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8. The R group on cysteine plays a critical role in the formation of _________ in proteins
a. ionic bonds b. disulfide bonds c. beta sheets d. alpha helices e. c and d |
b
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9. Sucrose contains:
a. glycine and glucose b. two glucose molecules c. glucose and fructose d. glutamine and aspartic acid e. none of the above |
c
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10. Tertiary structure refers to:
a. The sequence of amino acids in a protein b. The overall three dimensional structure of a protein c. The sequence of nucleotides in DNA d. The organization of protein complexes composed of multiple subunits e. none of the above |
b
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11. At the 3' end of an RNA molecule is a hydroxyl group that is part of
a. uracil b. cysteine c. phosphate d. ribose e. deoxyribose |
d
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12. The Miller and Urey experiment with the spark discharge apparatus showed
a. that amino acids can polymerize into proteins b. that nucleotides can form DNA c. that early forms of life were based on RNA d. that water and simple gases can form building blocks of biological molecules e. that life can be created in the laboratory |
d
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13.
A model for the secondary structure of a protein will tell you a. the position of disulfide bonds b. regions that form an alpha helix c. interacting sites between 2 or more polypeptides d. the 3-‐dimensional location of all atoms e. regions of hydrophobic interactions |
b
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14. In a DNA double helix, the sugar phosphate backbones of the two strands
a. run in the same parallel orientation b. run in an antiparallel orientation c. one strand goes 5' -> 5' and the other 3' -> 3' d. are located in the center of the helix e. none of the above |
b
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15. In a G-C DNA base pair
a. three hydrogen bonds form between the bases b. two hydrogen bonds form between the bases c. both bases are purines d. three covalent bonds form between the bases e. both bases are pyrimidines |
a
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16. You are given a DNA single strand of the sequence 5' ATGCCTGA 3'. Which of the
following DNA sequences will form a double helix with 8 base pairs with this sequence. a. 5' TACGGACT 3' b. 5' TCAGGCAT 3' c. 3' TCAGGCAT 5' d. 3' AGTCCGAT 5' e. 5' ATTATCCG 3' |
b
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17. DNA differs from RNA in that DNA
a. contains uracil and RNA does not b. contains deoxyribose c. is often single-stranded d. contains ribose e. contains phosphodiester bonds |
b
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18. DNA with a higher G + C content is more stable at high temperatures than DNA with
a high A + T content. Why? a. G and C base pair together while A and T do not b. The two chains assume a parallel orientation when the A + T content is higher c. The negative charge on the phosphates in the backbone is partially neutralized in DNA with higher G + C content d. hydrophobic interactions between G and C are stronger than between A and T e. G-C base pairs form three hydrogen bonds while A-T base pairs form only two |
e
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19. What is attached to the 5' carbon of deoxyribose in DNA?
a. adenine b. phosphate c. adenosine d. uracil e. -OH |
b
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