Bch 361 - Study guides, Class notes & Summaries

BCH 361 EXAM 2 QUESTIONS WITH ALL VERIFIED ANSWERS What is the purpose of the oxyanion hole in chymotrypsin? - Answer-The oxyanion hole is a structure at the active site of chymotrypsin that stabilizes the tetrahedral intermediate in the proteolysis reaction and facilitates the formation of the acyl-enzyme intermediate. What caused a "burst" of activity followed by a steady-state reaction when chymotrypsin was studied in the milliseconds subsequent to mixing the enzyme and substrate? - An...

BCH 361 ICLICKER QUESTIONS WITH REVISED AND UPDATED ANSWERS Which of the following can not be present when brewing alcoholic beverages? A. Water B. O2 C. Carbohydrate D. Microbes - Answer-B. O2 How many intermediates in glycolysis contains the functional group aldehyde? A. 0 B. 1 C. 2 D. 3 - Answer-B. 1 What is the effect of fructose 2,6-bisphosphate onglycolysis? A. It stimulates muscle PFK B. It inhibits liver pyruvate kinase C. It stimulates liver PFK D. It has no ef...

BCH 361 Ch. 6 TEST QUESTIONS WITH ANSWERS – UPDATED!! Is chymotrypsin specific of nonspecific? - Answer-specific Describe how chymotrypsin works - Answer-splits the peptide bonds only on the carboxyl side of large hydrophobic residues (W,Y,F,M) Is Thrombin specific or nonspecific? - Answer-very specific Describe how thrombin works - Answer-catalyzes the hydrolysis of arginine-glycine bonds in particular peptide sequence only Where is thrombin found? - Answer-in blood clotting N...

BCH 361 CH 2 EXAM QUESTIONS WITH ALL CORRECT ANSWERS Under appropriate conditions, protein folding proceeds: a) amphipathically. b) due to the hydrophobic effect. c) spontaneously. d) both amphipathically and due to the hydrophobic effect. e) both spontaneously and due to the hydrophobic effect - Answer-e You have a mixture of proteins with the following pKa's. Which of the statements below is TRUE? Protein X pKa = 2 Protein Y pKa = 6 Protein Z pKa = 10 a) At a pH of 6, p...

Final exam BCH 361 questions correctly answered

The titration curve of phosphoric acid is shown on the right. Which pH is not within the buffering range of phosphoric acid and its conjugate bases? A. 2.0 B. 4.0 C. 7.2 D. 12.4 - Answer B. 4.0

BCH 361 CH 1 EXAM QUESTIONS WITH ALL CORRECT ANSWERS Which of the following does NOT have a double membrane? a) a mitochondrion b) a nucleus c) a prokaryote d) an endosome - Answer-d The process of transcription is carried out by the enzyme _____. - Answer-RNA Polymerase Human beings contain a higher percentage of _____ than is found in the Earth's crust. a) sodium b) oxygen c) carbon d) magnesium e) potassium - Answer-c - Answer- Many biomolecules exist as polymers....

Which describes how cofactors and coenzymes affect the function of enzymes? A. increase or decrease catalytic function B. increase catalytic function C. do not impact catalytic function D. decrease catalytic function - Answer B

The ΔG of a reaction depends only on the free energy of the products (the final state) minus - Answer the free energy of the reactants (the initial state). The ΔG of a reaction is independent of the path (or molecular mechanism) of the transformation. The mechanism of a reaction has no effect on ΔG. The ΔG provides no information about the rate of a reaction. - Answer A negative ΔG indicates that a reaction can take place spontaneously, but it does not signify whether it will proceed ...

BCH 361 Ch. 7 TEST QUESTIONS WITH CORRECT ANSWERS Match the condition w/ the statement that describe it. Doubling [S] will almost double the rate A. [S]= 10Km B. [S]= Km C. [S]= 0.1 Km - Answer-C Match the condition w/ the statement that describe it. Half of the active sites are occupied by the substrate A. [S]= 10Km B. [S]= Km C. [S]= 0.1Km - Answer-B Determine how rxn rate (velocity) varies w/ substrate concentration. Rate increase, Rate decreases, Rate is unchanged A. a...