180. Which of the following is not a property of enzymes? Most enzymes catalyze

Question

180. Which of the following is not a property of enzymes? Most enzymes catalyze a chemical reaction in only one direction. b. Enzymes function optimally at a specific pH. c. Many enzymes are synthesized as inactive proenzymes or zymogens. d. Enzyme action can be inhibited or inactivated by various physical and chemical a. agents that change the shape of enzyme molecules. 181. The major final product that results from the digestion of carbohydrates is: a. glucose. b. sucrose. c. lactose. d. maltose. 182. The enzyme pepsin begins the digestion of a carbohydrates. b. protein fat. nucleic acids. Bicarbonates are useful in the GI tract to: a. neutralize hydrochloric acid. b. break down fats c. activate secretin. d. activate pepsin. 183. a. amino acids. b. fats. c. glucose. d. vitamins. 185. An end product of the action of the enzyme phospholipase is: a. b. c. d. colipase. a triglyceride. a free fatty acid. both B and C. 186. Saliva contains all of the following substances except a. amylase. b. lipase. c. intrinsic factor d. mucus. 28

Explanation / Answer

180. Option A is correct.
Many of the enzyme-catalyzed reactions are reversible.

181. Option A is correct.
Hydrolysis/digestion of carbohydrates produces glucose.

182. Option B is correct.
Pepsin is a protease. It digests proteins.

183. Option A is correct.
Bicarbonates are useful in the GI tract to neutralize stomach acid.

184. Option B is correct.
Chylomicrons transport lipids.

185. Option D is correct.
The end products of Phospholipase reaction are a triglyceride and fatty acid

186. Option C is correct.
Saliva does not contain intrinsic factor.

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