Cell & Molecular Biology Skromme Fall 2009 Tests 2 & 3

Cell & Molecular Biology Skromme Fall 2009 Tests 2 & 3 -...

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This page contains the test instructions. The test begins on next page. D O NOT TURN OVER THIS PAGE NOR START YOUR TEST UNTIL INSTRUCTED TO DO SO . Instructions The exam has a total of 33 multiple-choice questions. You have about 1 hour and 15 minutes to complete the exam. Choose the best answer for each question and mark the letter of your selection on the corresponding answer sheet. There is only one correct answer for each question. All questions have a 3-point value (99 points). Important things to remember Enter your name, c-number, seat number and exam version number on your answer sheet (version number goes in FM column). The exam version can be found on the next page. Do not turn over this pages until instructed so. Remember to neither give nor receive aid on the examination, cheating will be penalized. Books, notebooks, laptops, cell phones and other devices are not allowed during examination. You may keep the exam, but make sure to return your answer sheet with all your information filled in. Good luck!
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December 3, 2009 BIL 255, Section O, Molecular Cell Biology Test 3 version 1 : cell organization and movements, extracellular matrix, cell communication, cell cycle control, cell death and cancer 1. Which cellular response would be likely to occur more rapidly in response to an extracellular signal? a. Changes in cell secretion b. Increased cell division c. Changes in membrane potential d. Changes in mRNA levels 2. Keratins, neurofilaments, and vimentins are all categories of intermediate filaments. Which of the following properties below is not true of these types of intermediate filaments? a. They strengthen cells against mechanical stress. b. Dimers associate by noncovalent bonding to form a tetramer. c. They are found in the cytoplasm. d. Phosphorylation causes disassembly during every mitotic cycle. 3. Which of the following statements is false regarding DNA synthesis? a. DNA synthesis begins at origins of replication. b. The loading of the origin recognition complexes (ORCs) is triggered by S-Cdk. c. The phosphorylation and degradation of Cdc6 help to ensure that DNA is replicated only once in each cell cycle. d. DNA synthesis can only begin after pre-replicative complexes assembles on the ORCs. 4. Choose the phrase that best describes the hormone testosterone? a. A paracrine hormone that binds extracellular receptors b. An endocrine hormone that binds nuclear receptors c. A paracrine hormone that binds nuclear receptors d. An endocrine hormone that binds extracellular receptors
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5. The hydrolysis of GTP to GDP carried out by tubulin molecules ________________. a. provides the energy needed for tubulin to polymerize b. occurs because the pool of free GDP has run out c. tips the balance in favor of microtubule assembly d. allows the behavior of microtubules called dynamic instability 6. Irradiated mammalian cells usually stop dividing and arrest at a G 1 checkpoint. Which checkpoint protein prevents the cells from dividing? A.
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This note was uploaded on 11/03/2011 for the course BIL 255 taught by Professor Skromme during the Fall '08 term at University of Miami.

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Cell & Molecular Biology Skromme Fall 2009 Tests 2 & 3 -...

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