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- Question
The E.coli pyruvic acid dehydrogenase complex is reported to
Options- A. decatalyze the oxidation of pyruvic acid to acetyl Co A and CO2
- B. Catalyze the oxidation of pyruvic acid to acetyl Co A and CO2
- C. retard the reduction of pyruvic acid to acetyl Co A and CO2
- D. Catalyze the reduction of pyruvic acid to acetyl Co A and CO2
- Correct Answer
- Catalyze the oxidation of pyruvic acid to acetyl Co A and CO2
- 1. The role of Asp 102 and His 57 during trypsin catalysis is to
Options- A. neutralize the charge on the other's side chain
- B. keep the specificity pocket open
- C. function as a proton shuttle
- D. clamp the substrate into the active site Discuss
- 2. Which of the common features are shared between serine and aspartate proteases?
Options- A. Both require water to complete the catalytic cycle
- B. Both use a base to activate the nucleophile
- C. Both show specificity for certain amino acid sequences
- D. All of the above Discuss
- 3. How is the enzyme COX-1 important in human health?
Options- A. It helps to transport carbon dioxide in the blood
- B. It is critical for the biosynthesis of DNA
- C. It is a chemical derivative of aspirin
- D. It catalyzes the production of hormones that maintain the stomach lining Discuss
- 4. Which of the following is false statement with regard to comparison between Serine and HIV proteases?
Options- A. Both use nucleophilic attack to hydrolyze the peptide bond
- B. Both require water to complete the catalytic cycle
- C. Both forms an acyl-enzyme intermediate
- D. Both show specificity for certain amino acid sequences Discuss
- 5. Tryprotophan synthetase of E.coli, a typical bifunctional oligomeric enzyme consist of
Options- A. a protein designated A
- B. two proteins designated A and B
- C. a protein A and one-subunit a
- D. a protein designated B Discuss
- 6. The cleavage specificity of trypsin and chymotrypsin depend in part on the
Options- A. proximity of Ser 195 to the active site or specificity pocket
- B. size, shape, and charge of the active site or specificity pocket
- C. presence of a low-barrier hydrogen bond in the active site or specificity pocket
- D. absence of water in the active site Discuss
- 7. Which of the following (s) is/are serine proteases?
Options- A. Chymotrypsin
- B. Trypsin
- C. Elastase
- D. all of these Discuss
- 8. Which of the following is incorrect with regard to antigen epitopes?
Options- A. An epitope may be shared by two different antigens
- B. A protein molecule usually contains multiple epitopes
- C. B cells bind only processed antigen epitopes
- D. Epitopes may be linear or assembled Discuss
- 9. Very low doses of antigen may induce
Options- A. hypersensitivity
- B. immunological ignorance
- C. low zone tolerance
- D. low zone immunity Discuss
- 10. CD antigens
Options- A. allow leukocytes to recognize antigen
- B. are each expressed on only one cell type
- C. are expressed on immune cells to mark them for separation
- D. function as receptors for cytokine and CAMs Discuss
Enzymes problems
Search Results
Correct Answer: function as a proton shuttle
Correct Answer: All of the above
Correct Answer: It catalyzes the production of hormones that maintain the stomach lining
Correct Answer: Both forms an acyl-enzyme intermediate
Correct Answer: two proteins designated A and B
Correct Answer: size, shape, and charge of the active site or specificity pocket
Correct Answer: all of these
Correct Answer: B cells bind only processed antigen epitopes
Correct Answer: low zone tolerance
Correct Answer: function as receptors for cytokine and CAMs
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