Exam 2 Fall 08 ANS

Exam 2 Fall 08 ANS - Name Lab Section BIOL 301 EXAM 2 Blue...

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Name ___________________________ Lab Section ____ BIOL 301 EXAM 2 Blue 16 October 2008 Directions: Choose the one best answer for each question. If a question seems ambiguous or seems to have more than one correct answer or no correct answer, you may explain your reason for choosing the answer you did (and eliminating the other answers) with a brief comment written in the table below. You will get credit for the question if your reasoning is correct. To submit comments for consideration, fill in your name and lab section on this page and hand it in together with your scantron. Question Number Answer Chosen R e a s o n i n g
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BIOL 301 Fall 2008 Exam 2 Blue Page 2 of 7 ++ SENTENCE COMPLETION ++ In this group of questions, select the answer choice that best completes the statement or best answers the question. 1. A large motor unit is composed of _____. 1. a single muscle fiber 2. many muscle fibers 3. motor neuron 4. sensory neuron 5. tendon A. 1, 2 * B. 2, 3 C. 1, 2, 3 D. 2, 3, 4 E. 1, 2, 3, 4, 5 2. In the figure above, red blood cells (RBC) have been placed in a beaker of solution. Which of the following are true? 1. The RBC have plasmolyzed. 2. The RBC have crenated. 3. The solution is hypotonic to the RBC. 4. The solution is hypertonic to the RBC. 5. The concentration of osmotically active particles (OAP) in the solution is greater than in the RBC cytoplasm. 6. The concentration of osmotically active particles (OAP) in the RBC cytoplasm is greater than in the solution. A. 1, 3, 6 B. 1, 3, 5 * C. 2, 4, 5 D. 2, 4, 6 E. 2, 3, 5 3. Two BIOL 301 students were concerned about one of their houseplants that was looking unhealthy. Their neighborhood botanist suggested using a plant food solution that would be isotonic to the houseplant’s cells. The following graph was obtained from their experiment using MgCl 2 solutions to determine the molarity of an isotonic solution. Based on this data, which of the following statements are true? [Assume 89% dissociation of MgCl 2 .] 1. The osmolarity of the plant cell cytoplasm is about 200 mmoles/L of MgCl2. 2. The plant cell contains about 200 mmoles/L MgCl 2 in its cytoplasm. 3. The plant food solution should contain about 560 mOsmoles/L of osmotically active particles. 4. The osmolarity of the plant cell cytoplasm is less than 600 mOsmoles/L. 5. The plant food solution should contain about 200mmoles/L of MgCl 2 . 6. A 600 mOsmoles/L MgCl 2 solution is hypotonic to the plant cells. A. 1, 2, 5, 6 B. 4, 5, 6 C. 1, 5 D. 2, 6 * E. 3, 4
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BIOL 301 Fall 2008 Exam 2 Blue Page 3 of 7 4. In skeletal muscle contraction, all of the following events occur during the latent period, except : A. action potentials conduct into the T tubules * B. sarcomere shortens C. concentration of calcium ions increases in the sarcoplasm D. myosin-binding sites on the thin filaments are exposed E. calcium release channels in the sarcoplasmic reticulum open 5. In the figure above, the movement indicated by the arrow is _____. A. adduction
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This note was uploaded on 11/06/2010 for the course BIOL 301 taught by Professor De during the Fall '08 term at Purdue.

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Exam 2 Fall 08 ANS - Name Lab Section BIOL 301 EXAM 2 Blue...

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