Biology 101 Section 2

Biology 101 Section 2 - Biology 101, Section 1 Exam #2 Key...

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Biology 101, Section 1 Exam #2 Key 1) What is the function of sensory receptor cells? A. To receive a signal from the environment. B. To transduce a signal from the environment. C. To integrate a signal from the environment. D. All of the above. E. A and B only. 2) Researchers surgically fuse two of the three ossicles in the inner ear of a mouse, effectively leaving two functional, linked ossicles in place of three. When the mouse’s hearing is tested, what outcome would be expected? A. The mouse would be more sensitive to sound, but only in the low-frequency range. B. The mouse would be more sensitive to sound, but only in the high-frequency range. C. The mouse would be more sensitive to sound in general. D. The mouse would be less sensitive to sound in general. 3) How would an abnormally large oval window in a mouse affect that animal’s hearing? A. The mouse could detect noise at much lower volumes. B. The mouse could detect noise in a much broader range of frequencies. C. Hearing ability would be reduced in comparison with normal mice. D. Hearing is not affected by the size of the oval window. 4) What would happen to people exposed to a chemical warfare agent that blocked acetylcholine from binding to muscle receptors? A. Action potentials would be continuously generated, causing convulsive muscle contractions. B. Muscle contractions would be prevented. C. Muscle contractions could still occur, but relaxation of the muscle would be impaired. D. Both A and B apply.
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5) What would be the effect on muscle contraction if troponin were experimentally altered to no longer interact with tropomyosin, so the complex could no longer bind to actin? A. Muscle contraction could no longer occur. B. Muscles could not relax after contraction. C. Muscle contraction would be weakened, but would still occur as long as tropomyosin is functional. D. ATP could not be hydrolyzed by enzymes in the muscle. 6) A patient is hospitalized with muscle spasms caused by failure of back muscles to relax after contraction. Which of the following therapies would be most likely to help? A. Inject calcium into the muscle cell because it isn’t being released from the sarcoplasmic reticulum. B. Induce tropomycin and troponin to bind to the myosin binding sites on actin. C. Increase the amount of acetylcholine at the synapses between motor neurons and muscle cells. D. Depolarize the motor neurons to send an action potential to the muscle cells. 7) When a doctor tests your patellar reflex by tapping the tendon on the front of your knee, your lower leg comes forward. Which muscle is activated in this reflex? A. hamstring (located in the back of your thigh). B. quadriceps (located in the front of your thigh) 8) Which of the following involves a change in conformation (shape change) of a protein? A.
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This note was uploaded on 04/07/2008 for the course BIO 101 taught by Professor Houlihan during the Spring '08 term at UMass (Amherst).

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Biology 101 Section 2 - Biology 101, Section 1 Exam #2 Key...

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