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Unformatted text preview: 94 BSC 2011 QUIZ ONE (SELF-ASSESSMENT), HOMEOSTASIS Instructor: Phelps There are 22 questions on 4 pages. You will have 25 minutes to complete all questions. No extra time will be granted. Please check to make sure that all pages are present, intact, and in the correct order. Please mark your answers on the quiz in case there are any problems. The key is given at the end of the quiz. Good luck! Questions 1-16, recall and comprehension MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) What kinds of molecules pass through a cell membrane most easily? A) small and hydrophobic B) large polar C) monosaccharides such as glucose D) ionic E) large and hydrophobic 2) Which of the following statements is correct about diffusion? A) It is very rapid over long distances. B) It is an active process in which molecules move from a region of lower concentration to one of higher concentration. C) It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration. D) It requires an expenditure of energy by the cell. E) It requires integral proteins in the cell membrane. 3) A marine sea star was mistakenly placed in freshwater and it died. What is the most likely explanation for its death? A) The sea star was stressed and needed more time to adapt to new conditions. B) The cells of the sea star dehydrated and lost the ability to metabolize. C) The sea star is hypertonic to the freshwater, and it could not osmoregulate. D) The contractile vacuoles used to regulate water content ruptured in the freshwater. E) None of the above. 4) The digestion and utilization of which nutrient creates the greatest need for osmoregulation by the kidneys? A) oil B) protein C) cellulose D) starch E) fat 95 5) Which of the following is an example of countercurrent exchange? A) flow of blood in the dorsal vessel of an insect and that of air within its tracheae B) flow of water across the gills of a fish and that of blood within those gills C) flow of air within the primary bronchi of a human and that of blood within the pulmonary veins D) flow of water across the skin of a frog and that of blood within the ventricle of its heart E) flow of fluid out of the arterial end of a capillary and that of fluid back into the venous end of the same capillary 6) Which structure increases the reabsorption of Na+ when stimulated by aldosterone? A) renal cortex B) distal tubules C) proximal tubule D) Bowman's capsule E) loop of Henle 7) Compared to water-dwelling mammal, a dessert-dwelling mammal would be expected to have a A) smaller Bowman's capsule B) shorter collecting duct C) longer loop of Henle D) larger ureter E) longer AV node 8) Some nutrients are considered "essential" in the diets of certain animals because A) only those animals use the nutrients....
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