Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Active Lecture Questions CHAPTER 24 Nutrition, Metabolism, and Body Temperature Regulation Copyright © 2010 Pearson Education, Inc. The majority of the food we ingest is ultimately _________. a. converted to fat b. burned to produce oxygen c. used to synthesize ATP d. stored in the stomach Copyright © 2010 Pearson Education, Inc. A(n) ______ nutrient is one that the body cannot synthesize rapidly enough to be useful. a. regulatory b. essential c. endemic d. caloric Copyright © 2010 Pearson Education, Inc. It is possible for vegetarians to obtain complete proteins by combining ______ and ______. a. bread; vitamins b. fats; pasta c. legumes; cereal grains d. milk; sugar Copyright © 2010 Pearson Education, Inc. The major metabolic function for most vitamins is that they assist enzymes by serving as _________. a. sources of ATP b. active sites c. substrates d. coenzymes Copyright © 2010 Pearson Education, Inc. In general metabolic terms, food digestion is a form of ______, while building new protein molecules is a form of ______. a. metabolism; cellular respiration b. anabolism; catabolism c. cellular respiration; metabolism d. catabolism; anabolism Copyright © 2010 Pearson Education, Inc. What is the true function of molecular oxygen acquired by the lungs? a. O2 catalyzes the breaking of bonds in the glucose molecule. b. O2 catalyzes the synthesis of ATP. c. O2 serves as the final electron acceptor for the oxidation of food molecules. d. O2 drives energy dependent processes in our cells. Copyright © 2010 Pearson Education, Inc. From what process is energy derived to drive the ATP synthase enzyme in the mitochondria? a. Hydrogen ions are pumped into the intermembrane space of the mitochondria. b. Hydrogen ions flow down their concentration gradient through the ATP synthase enzyme into the matrix. c. Hydrogen ion flow powers ATP synthase to phosphorylate ADP. d. All of the above are true. Copyright © 2010 Pearson Education, Inc. Predict what would happen to ATP production if a virus pierced holes in the inner mitochondrial membrane. a. ATP production would be unchanged because the actual enzymes would not be affected. b. ATP production would increase 10 times because more H+ could flow back into the matrix. c. ATP production would decrease because a hydrogen ion gradient could not be established. d. ATP production would decrease because the virus destroyed the ATP synthase enzymes. Copyright © 2010 Pearson Education, Inc. Which of the following processes would be likely to occur in the skeletal muscle cells of a sprinter? a. Glycolysis b. Oxidative phosphorylation c. The Krebs cycle d. Lactic acid oxidation to pyruvic acid Copyright © 2010 Pearson Education, Inc. Which of the following nutrients can enter the Krebs cycle? a. Glucose b. Amino acids c. Pyruvic acid d. Both b and c Copyright © 2010 Pearson Education, Inc. Why don’t the electrons carried by NADH in the cytosol generate as many ATP as the electrons carried by NADH in the mitochondrial matrix? a. There aren’t as many electrons in the cytosol. b. The cytosolic electrons must be shuttled to the matrix at a loss of energy. c. The cytosolic electrons are transported to a different ATP synthase that is less efficient. d. They are smaller electrons. Copyright © 2010 Pearson Education, Inc. The process whereby excess glucose is stored in cells is called ______. a. glycogenesis b. glycogenolysis c. gluconeogenesis d. glycolysis Copyright © 2010 Pearson Education, Inc. For a marathon runner, what benefit is there to eating a diet of 75% carbohydrates and reducing the workout for 3 to 4 days before competition? a. Muscle cells will increase the total amount of protein. b. The extra carbohydrates are stored as fat. c. The muscle cells will store higher-thannormal levels of glycogen. d. The muscle cells will store higher than normal amounts of ATP. Copyright © 2010 Pearson Education, Inc. Why isn’t it sufficient to reduce only dietary fat intake to prevent new fatty deposits from forming in the body? a. Because ketone bodies form when fat intake is insufficient. b. Acetyl CoA, an intermediate in glucose metabolism, is also the starting point for fatty acid synthesis. c. Because muscle gets converted to fat. d. Because cholesterol gets converted to fat. Copyright © 2010 Pearson Education, Inc. Which of the following molecules is produced in the process of detoxifying harmful ammonia? a. Alpha-ketoglutaric acid b. Amine c. Urea d. Keto acids Copyright © 2010 Pearson Education, Inc. What is the primary process by which insulin is released after ingesting a meal? a. Insulin is secreted in direct response to blood glucose. b. The brain sends a hormone to the pancreas to stimulate insulin release. c. Insulin release is constant. d. The vagus nerve innervates the pancreas and upon food ingestion fires action potentials that stimulate insulin secretion. Copyright © 2010 Pearson Education, Inc. What is the primary objective during the postabsorptive state? a. To collect and remove glucose from the blood and deposit it in cells b. To convert fat to protein c. To maintain blood glucose at around 70– 110 mg/100 ml blood d. To elevate blood glucose to the highest possible level to ensure adequate delivery to the brain Copyright © 2010 Pearson Education, Inc. Where are the two primary sources of glucose during the postabsorptive state? a. Greater omentum and subcutaneous layer b. Stomach and intestine c. Liver and skeletal muscle d. Brain and skin Copyright © 2010 Pearson Education, Inc. Hyperglycemic hormones include glucagon and ______. a. insulin b. epinephrine c. GIP d. aldosterone Copyright © 2010 Pearson Education, Inc. About ______ of the body’s required cholesterol is dietary. a. 50% b. 85% c. 15% d. 100% Copyright © 2010 Pearson Education, Inc. Why are high-density lipoproteins (HDLs) considered “good”? a. The cholesterol transported by HDLs is destined for destruction. b. HDLs transport cholesterol to the peripheral tissues for biosynthesis of steroid hormones. c. HDLs transport cholesterol to adipose tissue. d. HDLs are actually considered “bad” cholesterol. Copyright © 2010 Pearson Education, Inc. Heat is produced internally by __________. a. friction between body parts b. breaking of bonds within ATP c. muscle contraction d. all of the above Copyright © 2010 Pearson Education, Inc. Which of the following structures is responsible for feeding behavior? a. pituitary b. medulla c. pons d. hypothalamus Copyright © 2010 Pearson Education, Inc. Which of the following factors is responsible for regulation of food intake? a. Hormones such as leptin or NPY b. Body temperature c. Psychological factors d. All of the above Copyright © 2010 Pearson Education, Inc. The basal metabolic rate can most effectively be defined as the __________. a. lowest point of energy used by the body b. amount of energy needed to maintain life c. maximal energy used by the body d. energy required to digest a meal Copyright © 2010 Pearson Education, Inc. Which of the following has the greatest effect on the BMR? a. Body surface area b. Muscle mass c. Fitness level d. Gender Copyright © 2010 Pearson Education, Inc. Of the following heat-promoting mechanisms, which appears to be most effective in adults? a. Constriction of cutaneous vessels b. Shivering c. Increased metabolic rate d. Thyroxine secretion Copyright © 2010 Pearson Education, Inc.