Name: 180. Which of the following is not a property o Most enzymes catalyze a ch

Question

Name: 180. Which of the following is not a property o Most enzymes catalyze a chemical reaction in only one direction. a. b. Enzymes function optimally at a specific pH. Many enzymes are synthesized as inactive proenzymes or d. zymogens c. Enzyme acti on can be inhibited or inactivated by various physical and chemical 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. b. protein c. fat d. nucleic acids. Bicarbonates are useful in the GI tract to: a. 183. b. c. d. neutralize hydrochloric acid. break down fats. activate secretin. activate pepsin. 184. Chylomicrons are formed to facilitate the transport of a. amino acids. b. fats c. glucose d. vitamins. 185. An end product of the action of the enzyme phospholipase is colipase. a. b. a triglyceride. a free fatty acid. c. d. both B and C. Saliva contains all of the following substances except: a. amylase. b. lipase. c. intrinsic factor. d. mucus 186. 28

Explanation / Answer

180. Enzymes are mosly made up of proteins and help to increase the reaction rate by catalysing the chemical reactions. Enzymes are catalysts.

Enzymes can work in bidirection or both the directions in a chemical reaction.

So the answer is option (A)

181. All the macro nutrients like carbohydrates, fats, proteins are digested to produce energy with the help of specific enzymes.

Digestion of carbohydrates forms end products like glucose, fructose and sucrose.

The answer is option (a) glucose

182. Pepsin is present in the stomach in insctive form as pepsinogen. It is produced by chief cells of stomach. On activation pepsinogen converts to enzyme pepsin and helps in protein digestion. So the answer is option (b) protein.

183. Sodium bicarbonate is present in gastric juices. Its role is to reduce the acidity of gastric juices.

So the answer is option (a)

184. Chylomicrons help in transport of dietary lipids that are absorbed by the intestine to muscles of heart and other organs to produce energy.

The answer is option (b) fats

185. Phospholipase enzyme helps in digestion pf lipids. In the process it forms free fatty acids.

So the answer is (c)

186. Saliva is secreted by salivary glands present in mouth. It starts the process of digestion in the mouth. It contains water, lipase, amylase, mucin.

So the answer is option (c) intrinsic factor.

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