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1、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
2、 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 Reasoning BIOL
3、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
4、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
5、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.
6、 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 houseplants cells. The following graph was obtained from their experiment using MgCl2 solutions
7、to determine the molarity of an isotonic solution. Based on this data, which of the following statements are true? Assume 89% dissociation of MgCl2. 1. The osmolarity of the plant cell cytoplasm is about 200 mmoles/L of MgCl2. 2. The plant cell contains about 200 mmoles/L MgCl2 in its cytoplasm. 3.
8、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 MgCl2. 6. A 600 mOsmoles/L MgCl2 solution is hypotonic to the plant c
9、ells. A. 1, 2, 5, 6 B. 4, 5, 6 C. 1, 5 D. 2, 6 * E. 3, 4 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 calci
10、um 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 B. circumduction * C. abduction D. rotation E. pronation 6. Whic
11、h of the following will increase the rate of diffusion? 1. an increase in the concentration gradient of the diffusing substance 2. an increase in the molecular weight of the diffusing substance 3. an increase in temperature 4. an increase in the surface area of the diffusion pathway A. 1, 2, 3, 4 B.
12、 1, 2, 4 * C. 1, 3, 4 D. 2, 3, 4 E. 1, 2 7. BIOL 301 students obtained the following data from an osmosis and diffusion experiment on an aquatic plant found in the nearby Celery Bog. What is the approximate osmolarity of the cytosol in this plants cells? (Assume 90% dissociation of the KCl solutions
13、.) Molarity of KCl Solution Percent of Cells Plasmolyzed 0.20 0 0.40 25 0.60 75 0.80 100 A. 250 milliosmoles/liter B. 500 milliosmoles/liter * C. 950 milliosmoles/liter D. 1200 milliosmoles/liter E. Do not choose this answer. 8. The bone shown below is an example of _ bone. A. a short B. a long C. a
14、 sesampoid D. a flat * E. an irregular 9. A 0.15M NaCl solution is isotonic for red blood cells (RBCs). What will happen to RBCs if they are placed in a 0.15M MgCl2 solution? (Assume 100% dissociation for both salts.) A. They will undergo hemolysis. B. They will undergo plasmolysis. C. They will nei
15、ther shrink nor burst. * D. They will undergo crenation. E. Do not choose this answer. BIOL 301 Fall 2008 Exam 2 Blue Page 4 of 7 Use the diagram below for questions 10 and 11. 10. The bone indicated by #9 is the _ and by #17 is the _. A. ulna, tibia B. radius, tibia C. humerus, femur D. ulna, fibula * E. radius, fibula 11. The bone indicated by #8 is the _ and is part of the _ skeleton. A. ilium, axial B. pubis, appendicular C. ischium, appendicular D. pubic sympysis, axial * E. ilium, appendicular 12. In a muscle twitch experiment, which of the following contribut
