biochem_quizzes2010

biochem_quizzes2010 - Quiz 1 1. Water can form _ hydrogen...

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Quiz 1 1. Water can form ______ hydrogen bonds. a. 1 b. 2 c. 3 d. 4 e. Answer is not given 2. The pH of 100 μM HCL is a. 1 b. 2 c. 3 d. 4 e. 5 3. Of the following, which element is more abundant in living systems? a. Calcium b. nickel c. iron d. nitrogen e. chlorine 4. Which of the following is only found in RNA? a. Thymine b. Guanine c. Adenine d. Cytosine e. Uracil
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5. The pKs of the weak acid citric acid (H3citrate) are 3.15, 4.77, and 6.40. What species would predominant at pH 5.0? a. H 3 citrate b. H 2 citrate 1- c. Hcitrate 2- d. citrate 3- e. Equal amounts of a and b f. Quiz 2 1. Glycine is best described as a(n) __________ amino acid. a. Nonpolar b. Polar c. Aromatic d. Positively charged e. Negatively charged 2. At physiological pH, the net charge on lysine is a. +2 b. +1 c. 0 d. -1 e. -2 3. All of the following are examples of secondary structure except
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a. Helix b. Antiparallel α sheet c. Parallel β sheet d. Random coil e. All are examples of secondary structure 4. 4. How does the hydrophobic effect influence the structure of large molecules? a. nonpolar molecules are not easily solubilized and aggregate b. polar groups are oriented on the surface, interacting with water c. nonpolar molecules can mask the characteristics of hydrophilic molecules d. a and b e. a and c 5. All are true about peptide bonds except a. Peptide bonds are formed by the condensation of the carboxylate group of one amino acid with the amino group of another amino acid b. There is free rotation around a peptide bond c. There is significant double bond character. d. Peptide bonds are polar covalent bonds. e. All of the above statements are true. Quiz 3 1. All of the following are true about enzymes except a. At high substrate concentrations, the enzyme can become saturated b. All enzymes are proteins
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c. Act a mild conditions d. Enzymes facilitate huge rate enhancements e. Enzymes demonstrate reaction specificity 2. The diagram below illustrates: a. Acid-base catalysis b. Covalent catalysis c. Proximity-orientation catalysis d. Transition state stabilization e. Metal ion catalysis 3. An apoenzyme a. is the fully functional enzyme b. has a prosthetic group associated with it c. is also called a holenzyme d. is the protein portion of an active enzyme e. is an enzyme with an associated metal ion 4. The type of enzyme that catalyzes the elimination of a group to form a double bond is a a. Transferase b. Hydrolyase c. Lyase d. Oxidoreductase e. ligase 5. The first step of the mechanism of RNase A shown below is an example of a. Covalent catalysis b. Transition state catalysis
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c. Nucleophilic catalysis d. Acid-base catalysis e. All of the above
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biochem_quizzes2010 - Quiz 1 1. Water can form _ hydrogen...

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