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Download 1) Which statement about enzymes is true
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1) Which statement about enzymes is true? A) All enzymes are proteins B) All enzymes have an optimum temperature of about 38 C C) Enzymes are denatured at low temperatures D) Enzymes are more effective at low temperatures 3) Some catalase was added to some hydrogen peroxide. Bubbles of oxygen were given off. After a while, the reaction stopped. Why did the reaction stop? A) The catalase was all used up B) The catalase was denatured by the reaction C) The hydrogen peroxide was all broken down D) The oxygen given off inhibited the catalase 6) Which type of enzyme digests starch? A) Catalase B) Lipase C) Protease D) Carbohydrase 8) Which food would provide calcium for tooth formation? A) Cabbage B) Milk C) Oranges D) Liver 10) Which nutrient helps collagen to form? A) Carbohydrates B) Iron C) Vitamin C D) Vitamin D 11) Why is digestion necessary? A) To destroy harmful bacteria in the food B) To make food pass easily through the alimentary canal C) To make nutrient molecules small enough to be absorbed D) To release energy from nutrients 2) Which is a correct sequence of organs through which food passes in the alimentary canal? A) Esophagus, stomach, small intestine B) Stomach, small intestine, pancreas C) Small intestine, pancreas, liver D) Pancreas, liver, large intestine 4) In which organs is protease secreted? A) Gall bladder and liver B) Mouth and large intestine C) Stomach and pancreas D) Esophagus and small intestine 5) How do bile salts help with digestion? A) They break down large droplets of fat into smaller ones B) They contain lipase, which digests fats C) They kill bacteria in food D) They neutralize the acidic contents of the stomach 7) What is the name for the muscular contractions that move food through the alimentary canal? A) Assimilation B) Digestion C) Peristalsis D) Ingestion 9) Which is the correct sequence in which food is dealt with in the body? A) Ingestion, digestion, absorption, assimilation B) Digestion, assimilation, absorption, ingestion C) Assimilation, digestion, absorption, ingestion D) Absorption, digestion, ingestion, assimilation 12) Why is fluoride sometimes added to water supplies? A) To improve the flavor of the water B) To prevent scurvy C) To reduce tooth decay D) To sterilize the water 13) Catalase catalyses a reaction in which hydrogen peroxide is broken down to water and oxygen. What are the substrate and product in this reaction? substrate product A) Catalase hydrogen peroxide B) Hydrogen peroxide water and oxygen C) Oxygen and water catalase D) Water oxygen
