PoB1 PRACTICE EXAM 3 (3)
MULTIPLECHOICE- 34 multiple choice, 2pts each (choosethebestanswer)
LEC. 18 (1-3)-Coordination, communication and tissue homeostasis
1. Positive feedback differs from negative feedback in that
A. Positive feedback benefits the organism, whereas negative feedback is detrimental.
B. The effector's response in positive feedback is in the same direction as the initiating stimulus
rather than opposite to it.
C. The effector's response increases some parameter (such as temperature), whereas in negative
feedback it decreases.
D. Positive feedback systems have only effectors, whereas negative feedback systems have only
receptors.
2. Although sometimes confused, acclimatization and adaptation are different. Please pick the wrong
statement(s):
A. Acclimatization is passed to the animal's progeny
B. Adaptation is a temporary change during an animal's lifetime
C. Acclimatization is a temporary change during an animal's lifetime
D. Adaptation is not passed to the animal's progeny
E. All statements are correct
3. Which of the following statements about coordinated responses in communication in multicellular
organisms is correct?
A. The endocrine system is slow and targets few cells
B. The nervous system is slow and targets many cells
C. The endocrine system is fast and targets a few cells
D. The nervous system is fast and targets a few cells
LEC. 19 (4-8)-Nutrition and digestive system
4. Some nutrients are considered "essential" in the diets of certain animals because
A. Only those animals use the nutrients.
B. They are subunits of important polymers.
C. They cannot be manufactured by the organism.
D. They are necessary coenzymes.
E. Only some foods contain them.
5. Which of the following describes peristalsis in the digestive system?
A. a process of fat emulsification in the small intestine
B. voluntary control of the rectal sphincters regulating defecation
C. the transport of nutrients to the liver through the hepatic portal vessel
D. a common cause of loss of appetite, fatigue, and dehydration
E. smooth muscle contractions that move food through the alimentary canal
6. Why are cattle able to survive on a diet consisting almost entirely of plant material?
A. They are autotrophic.
B. Cattle, like the rabbit, reingest their feces.
C. They manufacture all 15 amino acids out of sugars in the liver.
D. Cattle saliva has enzymes capable of digesting cellulose.
E. They have cellulose-digesting, symbiotic microorganisms in chambers of their stomachs.
1
, 7. Without functioning parietal cells, which of the following would you expect for an individual?
A. not to be able to initiate protein digestion in the stomach
B. not to be able to initiate mechanical digestion in the stomach
C. only to be able to digest fat in the stomach
D. not to be able to produce pepsinogen
E. not to be able to initiate digestion in the small intestine.
8. Which of the following organs is incorrectly paired with its function?
A. stomach-protein digestion
B. oral cavity-starch digestion
C. large intestine-bile production
D. small intestine-nutrient absorption
E. pancreas-enzyme production
LEC. 20 (9-13)- Circulation and Gas exchange
9. What would be expected if the amount of interstitial fluid surrounding the capillary beds of the lungs
were to increase significantly?
A. The amount of carbon dioxide entering the lungs from the blood would increase.
B. The amount of oxygen entering the circulation from the lungs would increase.
C. The amount of oxygen entering the circulation from the lungs would decrease.
D. The pressure would cause the capillary beds to burst.
E. Both C and D would be expected.
10. Why is gas exchange more difficult for aquatic animals with gills than for terrestrial animals
A. Water is less dense than air.
B. Water contains much less O2 than air per unit volume.
C. Gills have less surface area than lungs.
D. Gills allow only unidirectional transport
E. Gills allow water to flow in one direction
11. Air rushes into the lungs of humans during inhalation because
A. The rib muscles and diaphragm contract, increasing the lung volume.
B. Pressure in the alveoli increases.
C. Gas flows from a region of lower pressure to a region of higher pressure.
D. Pulmonary muscles contract and pull on the outer surface of the lungs.
E. A positive respiratory pressure is created when the diaphragm relaxes.
12. The blood level of which gas is most important in controlling human respiration rate?
A. Nitric acid
B. Nitrogen
C. Oxygen
D. Carbon dioxide
E. Carbon monoxide
13. Hemoglobin is a phenomenal oxygen carrier. From its saturation curve and other properties, we
deduce that hemoglobin releases the most oxygen at:
A. High O2 partial pressures
B. High O2 partial pressures and at high pH
C. High CO2 partial pressures
D. High CO 2partial pressures and at low pH
E. A constant rate across all O2 partial pressures
2
MULTIPLECHOICE- 34 multiple choice, 2pts each (choosethebestanswer)
LEC. 18 (1-3)-Coordination, communication and tissue homeostasis
1. Positive feedback differs from negative feedback in that
A. Positive feedback benefits the organism, whereas negative feedback is detrimental.
B. The effector's response in positive feedback is in the same direction as the initiating stimulus
rather than opposite to it.
C. The effector's response increases some parameter (such as temperature), whereas in negative
feedback it decreases.
D. Positive feedback systems have only effectors, whereas negative feedback systems have only
receptors.
2. Although sometimes confused, acclimatization and adaptation are different. Please pick the wrong
statement(s):
A. Acclimatization is passed to the animal's progeny
B. Adaptation is a temporary change during an animal's lifetime
C. Acclimatization is a temporary change during an animal's lifetime
D. Adaptation is not passed to the animal's progeny
E. All statements are correct
3. Which of the following statements about coordinated responses in communication in multicellular
organisms is correct?
A. The endocrine system is slow and targets few cells
B. The nervous system is slow and targets many cells
C. The endocrine system is fast and targets a few cells
D. The nervous system is fast and targets a few cells
LEC. 19 (4-8)-Nutrition and digestive system
4. Some nutrients are considered "essential" in the diets of certain animals because
A. Only those animals use the nutrients.
B. They are subunits of important polymers.
C. They cannot be manufactured by the organism.
D. They are necessary coenzymes.
E. Only some foods contain them.
5. Which of the following describes peristalsis in the digestive system?
A. a process of fat emulsification in the small intestine
B. voluntary control of the rectal sphincters regulating defecation
C. the transport of nutrients to the liver through the hepatic portal vessel
D. a common cause of loss of appetite, fatigue, and dehydration
E. smooth muscle contractions that move food through the alimentary canal
6. Why are cattle able to survive on a diet consisting almost entirely of plant material?
A. They are autotrophic.
B. Cattle, like the rabbit, reingest their feces.
C. They manufacture all 15 amino acids out of sugars in the liver.
D. Cattle saliva has enzymes capable of digesting cellulose.
E. They have cellulose-digesting, symbiotic microorganisms in chambers of their stomachs.
1
, 7. Without functioning parietal cells, which of the following would you expect for an individual?
A. not to be able to initiate protein digestion in the stomach
B. not to be able to initiate mechanical digestion in the stomach
C. only to be able to digest fat in the stomach
D. not to be able to produce pepsinogen
E. not to be able to initiate digestion in the small intestine.
8. Which of the following organs is incorrectly paired with its function?
A. stomach-protein digestion
B. oral cavity-starch digestion
C. large intestine-bile production
D. small intestine-nutrient absorption
E. pancreas-enzyme production
LEC. 20 (9-13)- Circulation and Gas exchange
9. What would be expected if the amount of interstitial fluid surrounding the capillary beds of the lungs
were to increase significantly?
A. The amount of carbon dioxide entering the lungs from the blood would increase.
B. The amount of oxygen entering the circulation from the lungs would increase.
C. The amount of oxygen entering the circulation from the lungs would decrease.
D. The pressure would cause the capillary beds to burst.
E. Both C and D would be expected.
10. Why is gas exchange more difficult for aquatic animals with gills than for terrestrial animals
A. Water is less dense than air.
B. Water contains much less O2 than air per unit volume.
C. Gills have less surface area than lungs.
D. Gills allow only unidirectional transport
E. Gills allow water to flow in one direction
11. Air rushes into the lungs of humans during inhalation because
A. The rib muscles and diaphragm contract, increasing the lung volume.
B. Pressure in the alveoli increases.
C. Gas flows from a region of lower pressure to a region of higher pressure.
D. Pulmonary muscles contract and pull on the outer surface of the lungs.
E. A positive respiratory pressure is created when the diaphragm relaxes.
12. The blood level of which gas is most important in controlling human respiration rate?
A. Nitric acid
B. Nitrogen
C. Oxygen
D. Carbon dioxide
E. Carbon monoxide
13. Hemoglobin is a phenomenal oxygen carrier. From its saturation curve and other properties, we
deduce that hemoglobin releases the most oxygen at:
A. High O2 partial pressures
B. High O2 partial pressures and at high pH
C. High CO2 partial pressures
D. High CO 2partial pressures and at low pH
E. A constant rate across all O2 partial pressures
2
