Which of the following statements about an enzyme is TRUE? (Points : 4) a) Enzym

Question

Which of the following statements about an enzyme is TRUE? (Points : 4) a) Enzymes decrease the speed of a chemical reaction.
b) Enzymes are not used up in a chemical reaction.
c) Enzymes alter the thermodynamics of a reaction.
d) Enzyme kinetics is the 3rd order rate reaction. Question 6.6. (TCO 3) Which of the following statements about ping-pong mechanism is TRUE? (Points : 4) a) Ping-pong mechanism is a mechanism of enzyme inhibition.
b) In ping-pong mechanism, first the substrate binds to the enzyme, then forms a product, and modifies the enzyme.
c) In ping-pong mechanism, there is no order in which substrates can bind and form products.
d) Ping-pong mechanism is a measure of how fast products are formed. Question 7.7. (TCO 3) Which of the following statements about random mechanism is TRUE? (Points : 4) a) Random mechanism is a mechanism of enzyme inhibition.
b) In random mechanism, there is no order in which substrates can bind and form products.
c) Random mechanism is a measure of how fast products are formed.
d) In random mechanism, first the substrate binds to the enzyme, then forms a product, and modifies the enzyme. Question 8.8. (TCO 4) Which of the following statements about the composition of starch is TRUE? (Points : 4) a) Starch is a polymer of amylose and amylopectin.
b) Starch is a branched polymer found in plants.
c) Amylase is the enzyme that degrades starch.
d) All of the above Question 9.9. (TCO 4) Which of the following statements about chitin is TRUE? (Points : 4) a) Chitin is a structural polymer found in some algae and fungi cells.
b) Chitin is a linear polymer.
c) Chitin is a polymer of beta (1-4) linked N-Acetylglucosamine.
d) All of the above Question 10.10. (TCO 6) Which of the following statements is a correct description of the term “catabolism”? (Points : 4) a) The term catabolism is defined as the sum of all reactions in a cell.
b) The term catabolism describes the reactions that are subject to regulation.
c) The term catabolism describes the synthetic reactions in a cell.
d) The term catabolism describes the degradative reactions in a cell. Question 11.11. (TCO 6) Which of the following statements is a correct description of the term “metabolism”? (Points : 4) a) The term metabolism is defined as the sum of all reactions in a cell.
b) The term metabolism describes the reactions that are subject to regulation.
c) The term metabolism describes the synthetic reactions in a cell.
d) The term metabolism describes the degradative reactions in a cell. Question 12.12. (TCO 7) Which of the following statements about anaerobic respiration in animal cells is TRUE? (Points : 4) a) Pyruvate is ultimately converted to CO2 and H2O in animal cells.
b) It occurs in presence of oxygen.
c) It generates the most amount of ATP.
d) None of the above are true Question 13.13. (TCO 7) Which of the following describes the function of coenzyme A in lipid metabolism? (Points : 4) a) Coenzyme A is crucial in lipid storage.
b) Coenzyme A is crucial in lipid uptake by cells.
c) Coenzyme A is needed to charge the lipid before it participates in metabolism such as Acetyl CoA.
d) None of the above Question 14.14. (TCO 7) The following coenzyme is used for lipid biosynthesis, which is _____ in the process. (Points : 4) a) NADP+; Reduced
b) NADPH; Oxidized
c) NAD+; Reduced
d) NAD+; Oxidized Question 15.15. (TCO 7) Which of the following is the number of ATP produced per molecule of stearic acid? (Points : 4) a) 32 ATP
b) 120 ATP
c) 240 ATP
d) 55 ATP Question 16.16. (TCO 9) Which of the following is a product of nitrogen catabolism in animal cells? (Points : 4) a) Pyruvate
b) Urea
c) Allantoin
d) Ammonium ion Question 17.17. (TCO 9) Which of the following molecules plays crucial roles in the feedback inhibition of nitrogen metabolism? (Points : 4) a) Glutamate
b) Urea
c) Allantoin
d) Ammonium ion Question 18.18. (TCO 9) Which of the following is true for purine synthesis? (Points : 4) a) Nitrogen is supplied by glycine, aspartate, and glutamine.
b) Carbon is supplied by N-Formyl tetrahydrofolate.
c) Carbon is supplied by glycine and CO2.
d) All of the above Which of the following statements about an enzyme is TRUE? (Points : 4) a) Enzymes decrease the speed of a chemical reaction.
b) Enzymes are not used up in a chemical reaction.
c) Enzymes alter the thermodynamics of a reaction.
d) Enzyme kinetics is the 3rd order rate reaction.

Explanation / Answer

Ans 5 B. enzymes are not used up in the chemical reaction.

Enzymes are also called as bilogical catalysts as they speed up the biochemical reactions of our body without actually getting used up. They provide active sites for the binding of substrates so that product formation is feasible. They cannot mess up with the thermodynamics of the reaction.

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