A molecule wi will a. increase the rate of the reaction. b. decrease the rate of
ID: 147644 • Letter: A
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A molecule wi will a. increase the rate of the reaction. b. decrease the rate of the reaction. c. have no effect on the rate of the reaction. d. change the equilibrium constant for the reaction. e. none of the above. 8. th a shape that is exactly complementary to the substrate/active site of an enay d. serine, threonine, and isoleucine e. serine, tryptophan, and alanine 9. Which group consists only of amino acids with polar side chains? a. b. c. serine, threonine, and leucine serine, threonine, and cysteine serine, threonine, and valine 1o. Which of the following interactions play no role in stabilizing tertiary and/or quaternary structure? a. Hydrophobic interactions c. Hydrogen b. Electrostatic interactions They all play a role bonds d. Covalent bonds e. I1. Which of the following classes of enzymes catalyze reactions involving the cleavage of a bond by the addition of water across the bond? a. Transferase rase b. Hydrolase c.Lyase d. Ligase Given the R-groups in the peptide, Asp-GIn-Arg-Ser-His, it would likely be: a. Very water soluble b. Somewhat water soluble 12. d. Not soluble at all e. Cannot tell from the sequence c. Not very water soluble 13. Which of the following amino acids is least likely to take part in the catalysis of a nucleophilic reaction? a. Serine b. Threonine c. Tyrosine d. Glycine e. Glutamate 14. Which statement is incorrect about prions? The cellular form of the prion protein (PrP) contains little to no structure. a. b. The abnormal prion protein (PrP*) contains about 50% ß structure. c. PrPs is resistant to denaturation and proteases. d. PrPC is the "infectious" particle. e. PrP catalyzes the abnormal folding of PrP 15. Substrates bind to allosteric enzymes in a cooperative manner. Which of the following statemen regarding cooperative substrate binding is true? a. Two or more proteins aid the binding of a substrate. b. The binding of one substrate makes it easier to bind the second and subsequent substrate c. d. e. molecules The folding of part of a protein aids in the folding of the remainder of the protein All enzymes engage in cooperative binding, not just allosteric enzymes. The binding of a cofactor to a protein aids in the binding of a substrate.Explanation / Answer
8. C) decrease the rate of reaction. As the molecule has the same shape as that of substrate, it will act as competitive inhibitors by competing with the substrate for binding at the active site.
9. B) serine, threonine, and cysteine. Serine and threonine are polar because of hydroxyl group present in their side chain. Cysteine can be referred as relatively less polar. Cysteine is a sulfur containing amino acid in its side chain. As sulfur is more electronegative than hydrogen, cysteine can be considered polar.
10. E) they all play a role.
11. B) hydrolase.
12. A) very water soluble. All the amino acids are polar/charged.
13. D) Glycine.
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