70.Three structures are listed below. Molecule A and B are:

(A) enatiomers
(B) epimers
(C) mirror-image stereoisomers
(D) none of the above

71.The figure shown below is a ball-and-stick representation of the crystal structure of a lipid (Note that the H atoms, which are often not evident in X-ray crystallography, are not shown). This lipid is: (A) linolenic acid (B) palmitic acid (C) triacylglycerol (D) phosphatidylethanolamine

72.The structure of a dipeptide is shown below. Which bond indicates the peptide bond? (A) 1 (B) 3 (C) 1 and 3 (D) none of the above

73.The concept of "induced fit"for enzyme activity refers to the fact that: (A) enzyme-substrate binding induces movement along the reaction coordinate to the transition state (B) enzyme-substrate binding induces an increase in the reaction entropy, thereby catalyzing the reaction (C) substrate binding may induce a conformational change in the enzyme, which then brings catalytic groups into proper orientation (D) when a substrate binds to an enzyme, the enzyme induces a loss of water (desolvation) from the substrate

74.Several oxygen dissociation curves are listed in the figure below.  If curve #2 indicates the purified hemoglobulin in a solution containing physiological concentration of CO2 and BPG at pH 7.0, then which curve should represent the oxygen dissociation curve when the pH increases? (A) 1 (B) 2 (C) 3 (D) 4

75.By adding SDS (sodium dodecyl sulfate) during the electrophoresis of proteins, it is possible to: (A) measure an enzyme's specific activity (B) preserve a protein's native structure and biological activity (C) determine a protein's isoelectric point (D) separate proteins exclusively on the basis of molecular weight

76.After one hour of electrophoresis in an agarose gel at a field strength of 5 volts/cm, one DNA fragment migrated 10 cm while another DNA fragment migrated only 6 cm. From this information you can conclude: (A) that the DNA that migrated 10 cm is larger than the DNA that migrated 6 cm (B) that the DNA that migrated 10 cm is smaller than the DNA that migrated 6 cm (C) nothing about the sizes of the DNA fragments without information about the migration of DNA size standards (D) that the experiment failed

77.The structures of purine and pyrimidine are shown below. The N atom at the position 1 of a purine molecule comes from: (A) glutamine (B) glycine (C) aspartate (D) tyrosine

78.Which lines are the inhibitor lines (with inhibitors) for Plot (1) and (2) below, respectively?

79.Kozak sequence (ACCAUGG) is the sequence involved in the identification of translational initiation site. Using the genetic code below, how many possible polypeptide chains will be produced from the nucleic acid sequence? (A) 1 (B) 2 (C) 3 (D) 4

80.Continuing from the above question, which of the following is not included in any possible polypeptide chain? (A)Glycine (B) Cysteine (C) Valine (D) Lysine

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