CH 369 exam2s05 - CH 369 Exam 2 - Spring 2005 Multiple...

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CH 369 Exam 2 - Spring 2005 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. These are all differences between hemoglobin (Hb) and myoglobin (Mb). The choices are: 1. Hb transports oxygen while Mb stores it. 2. Mb has quarternary structure but Hb does not. 3. Mb displays simple kinetics of binding while Hb displays cooperativity. The answers are: a. Number 1. b. Number 2. c. Number 3. d. Both 1 and 3. e. All three are correct. 2. Binding of bis phosphoglyceric acid (BSP) has the following effects on hemoglobin. The choices are 1. Leads to tighter binding of oxygen 2. Explains why maternal (adult) Hb binds oxygen more tightly than fetal Hb 3. Causes oxygen to dissociate from Hb The answers are a. Number 1. b. Number 2. c. Number 3. d. Both 1 and 2. e. Both 2 and 3. 3. Induced fit between the enzyme's active site and the substrate implies all of the following, except : a. The enzyme is a flexible molecule. b. An enzyme will work equally well with different substrates. c. An active site can bind to different substrates. d. The enzyme is a flexible molecule so different substrates can bind. e. All of these are correct. 4. Which of the following is not true about the enzyme chymotrypsin: a. The enzyme can cleave peptides. b. The enzyme can cleave esters. c. The enzyme only binds to aromatic substrates. d. The enzyme can cleave substrates which are not naturally occurring. e. All of these are true for chymotrypsin. 5. Competitive inhibitors have this effect: a. Modifying the Km value. b. Changing the value for Vmax. c. Interfering with substrate binding. d. This type of inhibitor both changes the Km and interferes with substrate binding. e. All of these are correct.
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6. A triple helix is the right handed helical structure formed by three left handed helical polypeptide chains in a. tubulin c. myosin b. keratin d. collagen 7. The addition of monomeric units to one end of a polymer and their removal from the opposite end such that the length of the polymer remains unchanged is called: a. hand-over-hand c. processivity b. treadmilling d. depolymerizing 8. Kinesin, which moves along the microtubule for many cycles of ATP hydrolysis without dissociation, is considered to have high: a. conductivity c. exclusivity b. processivity d. specificity 9. The protein actin can exist in two forms: a. globular and polymeric c. globular and deactivated b. GTP and ATP binding forms d. GDP and ADP binding forms 10. Collagen molecules are cross-linked via modified _________ residues. a. Arg c. Lys b. Cys d. Thr 11. First order kinetics means: a. The rate of a reaction is independent of the amount of reactant measured. b. The rate of the reaction varies directly with the amount of reactant measured.
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This note was uploaded on 03/30/2010 for the course CH 369 taught by Professor Kbrowning during the Spring '07 term at University of Texas at Austin.

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CH 369 exam2s05 - CH 369 Exam 2 - Spring 2005 Multiple...

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