exam2a - BIOL/CHEM 3361 Spring 2011 Name_ EXAM 2 FORM A...

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BIOL/CHEM 3361 Name__________________________ Spring 2011 EXAM 2 FORM A Place your name at the top of this page of the exam. On the F-1712 Scantron form, use a no. 2 pencil to enter your test form designation, i.e., A or B. Also print and encode your name and your UTD ID (starting in the first column on the left and leaving the last spaces blank). Leave phone number, code and subject score sections blank. Select the best answer for the following multiple-choice questions and enter the corresponding letter on the Scantron sheet. You may use these test pages to make notes and work problems. You may use a non-graphing calculator or a graphing calculator you have cleared of all stored data. When finished, turn in this exam along with your Scantron sheet. 1. The β turns of a protein are examples of a. primary structure b. secondary structure c. supersecondary structure d. tertiary structure e. quaternary structure 2. Which of the following is one of the six major classes of enzymes as designated by the International Union of Biochemistry? a. kinase b. aldolase c. lyase d. phosphatase e. recombinase 3. The T m of a protein is a. the temperature at which it is catalytically most active b. the temperature at which the protein denatures c. the time it takes to undergo one round of catalysis d. the half-time for folding of the protein e. a type of turn the polypeptide can make, i.e. a secondary structure 4. Sulfa drugs are analogs of p-aminobenzoic acid (aka PABA). They function by a. competitively inhibiting folic acid synthesis b. uncompetitively inhibiting folic acid synthesis c. noncompetitively inhibiting folic acid synthesis d. irreversibly inhibiting folic acid synthesis e. none of the above 5. For a bisubstrate reaction, a Lineweaver-Burk plot consisting of a set of parallel lines is characteristic of a. a ping pong double displacement reaction. b. a random single displacement reaction. c. an ordered single displacement reaction d. a random triple displacement reaction e. none of the above.
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6. Which of the following structures can form the basis of a protein domain? a. β -propellers b. β -sandwiches c. β -barrels d. a & c e. all of the above 7. When the [S]/K m ratio is 4/1 for a Michaelis-type enzyme, what will be the v o /V max ratio? a. 1/9 b. 2/3 c. 1/1 d. 4/5 e. 1/4 8. Post-translationally modified amino acid residues in a protein are part of the protein’s a. quaternary structure b. tertiary structure c. supersecondary structure d. secondary structure e. primary structure 9. Nerve gases and organophosphorus insecticides irreversibly inhibit a. cAMP phosphodiesterase b. cGMP phosphodiesterase c. acetyl cholinesterase d. D-alanyl transpeptidase e. aspartyl transaminase 10. Which of the following is a way enzymes catalyze reactions?
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This note was uploaded on 02/08/2012 for the course CHEM 3361 taught by Professor Marsh during the Spring '11 term at University of Texas at Dallas, Richardson.

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exam2a - BIOL/CHEM 3361 Spring 2011 Name_ EXAM 2 FORM A...

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