CH369 FinalExam05 - Name: _ Date: _ 1. In a neutral aqueous...

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Page 1 Name: __________________________ Date: _____________ 1. In a neutral aqueous solution the concentrations of H + and OH - are each: A) 55 M B) 1 x 10 –7 M C) 1 x 10 –14 M D) 5 mM E) none of the above 2. The most important buffering system for maintaining proper blood pH is: A) the charges on the amino acids B) the bicarbonate buffer system of CO 2 , carbonic acid, and bicarbonate C) phosphate groups of serum phosphoproteins D) none of the above E) all of the above 3. The linkage between nucleotides is a: A) peptide linkage B) phosphodiester bond C) amide bond D) all of the above E) none of the above 4. The amino acids with charged side chains at neutral pH include: A) aspartate, glutamate, lysine, and arginine B) aspartate, glutamate, and glycine C) aspartate, lysine, and arginine D) aspartate, glutamate, lysine, glycine, and arginine E) none of the above 5. Amino acids contain the following groups linked to a single carbon: A) an amino group and a carboxylate group B) an amino group and an R group C) a carboxylate group and an R group D) an amino group and a carboxylate group and an R group E) none of the above
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Page 2 6. The height of the activation barrier determines: A) the free energy change of the reaction B) the rate of the reaction C) the probability that the reaction will be spontaneous D) A and C E) A, B, and C 7. In a simple enzyme-catalyzed reaction, as substrate concentration increases the reaction velocity: A) continues to increase linearly at higher substrate concentrations B) increases logarithmically at higher substrate concentration C) increases at a lower rate at higher substrate concentrations D) none of the above E) all of the above 8. Competitive inhibitors have the following effects on K M and V max : A) They alter the value of K M but not V max B) They alter the value of V max but not K M C) They alter the value of K M and V max D) none of the above E) all of the above 9. A membrane is impermeable to charged molecules and does not allow passage of ions because of: A) the thickness of the membrane B) the hydrophobic nature of the membrane C) the hydrophilic nature of the membrane D) all of the above E) none of the above 10. The carbohydrate portion of a glycoprotein is found: A) on the interior side of the cell membrane B) spanning the cell membrane C) on the exterior side of the cell membrane D) all of the above E) none of the above
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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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CH369 FinalExam05 - Name: _ Date: _ 1. In a neutral aqueous...

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