BSC2011 Exam 1 key - Fall 2009 Version A Supplemental...

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Version A Supplemental Instruction: BSC 2011 Exam 1 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 de- creases. D) positive feedback systems have only effectors, whereas negative feedback systems have only receptors. E) positive feedback systems have control centers that are lacking in negative feedback systems. 2) Which choice best describes a reasonable evolutionary mechanism for animal structures becoming better suited to specific functions? A) Animals that eat the most food become the most abundant. B) Animals that restrict their food intake will become less abundant. C) Animals with mutations that give rise to effective structures will become more abundant. D) Animals with inventions that curtail reproduction will become more abundant. E) Animals with parents that continually improve their offspring's structures will become more abundant. 3) 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. 4) Similar fusiform body shapes are seen in sharks, penguins, and aquatic mammals because A) natural selection has no limits when different organisms face the same challenge. B) respiration through gills is enhanced by having a fusiform shape. C) the laws of physics constrain the shapes that are possible for aquatic animals that swim very fast. D) the fusiform shape is coded by the same gene in all three types of animals. E) all three types evolved from ancestral forms that fly in the air. 5) In which animal does blood flow from the pulmocutaneous circulation to the heart before circulating through the rest of the body? A) earthworm B) mollusc C) fish D) frog E) insect 6) A cell that contains proteins enabling a hormone to selectively bind to its plasma membrane is called a(n) A) secretory cell. B) plasma cell. C) endocrine cell. D) target cell. E) regulatory cell. 7) The endocrine system and the nervous system are structurally related. Which of the following cells best illustrates this relationship? A) a neuron in the spinal cord B) a steroid-producing cell in the adrenal cortex C) a neurosecretory cell in the hypothalamus D) a brain cell in the cerebral cortex E) a cell in the pancreas that produces digestive enzymes 8) A human red blood cell in an artery of the left arm is on its way to deliver oxygen to a cell in the thumb. From this point in the artery, how many capillary beds must this red blood cell pass through before it returns to the left ventricle of the heart? A) one
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This note was uploaded on 03/30/2010 for the course BSC BSC2011 taught by Professor Evans during the Spring '10 term at École Normale Supérieure.

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BSC2011 Exam 1 key - Fall 2009 Version A Supplemental...

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