practice_book_biology

For example on the edition listed above as form a a

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Unformatted text preview: ed above as “Form A,” a raw score of 101 through 103 would earn a scaled score of 700. Below are a few of the possible ways in which a scaled score of 700 could be earned on the edition: Examples of Ways to Earn a Scaled Score of 700 on the Edition Labeled as “Form A” Number of Questions Used to Compute Raw Score 199 199 199 199 199 199 Raw Score 101 101 101 103 103 103 Questions Answered Correctly 101 111 120 103 112 122 Questions Answered Incorrectly 0 39 78 0 37 75 Questions Not Answered 98 49 1 96 50 2 BIOLOGY TEST PRACTICE BOOK 9 Practice Test To become familiar with how the administration will be conducted at the test center, first remove the answer sheet (pages 69 and 70). Then go to the back cover of the test book (page 64) and follow the instructions for completing the identification areas of the answer sheet. When you are ready to begin the test, note the time and begin marking your answers on the answer sheet. 10 BIOLOGY TEST PRACTICE BOOK FORM GR0624 24 GRADUATE RECORD EXAMINATIONS® BIOLOGY TEST Do not break the seal until you are told to do so. The contents of this test are confidential. Disclosure or reproduction of any portion of it is prohibited. THIS TEST BOOK MUST NOT BE TAKEN FROM THE ROOM. Copyright © 1999, 2003, 2006 by Educational Testing Service. All rights reserved. GRE, GRADUATE RECORD EXAMINATIONS, ETS, EDUCATIONAL TESTING SERVICE and the ETS logos are registered trademarks of Educational Testing Service. 13 NO TEST MATERIAL ON THIS PAGE 14 BIOLOGY TEST Time—170 minutes 200 Questions Directions: Each of the questions or incomplete statements below is followed by five suggested answers or completions. Select the one that is best in each case and then completely fill in the corresponding space on the answer sheet. 1. In the formation of the secondary structure of a protein, which of the following are most responsible for holding an alpha-helix region in its helical form? (A) (B) (C) (D) (E) Ionic bonds Hydrogen bonds Disulfide bonds Hydrophobic interactions van der Waals interactions 5. Separation of molecules according to size can be achieved by which of the following? (A) (B) (C) (D) (E) Gel-filtration chromatography Ion-exchange chromatography Affinity chromatography Isoelectric focusing X-ray diffraction 6. Which of the following is true of the movement of cilia and flagella in eukaryotes? (A) (B) (C) (D) (E) It produces ATP. It is the result of a rotating motion. It is identical to that of bacterial flagella. It is driven by a proton gradient. It results from one microtubule pair sliding along a neighboring microtubule pair. 2. Why do erythrocytes swell and burst when placed in water? (A) Since water concentration is higher outside the cell, water moves inward by passive diffusion. (B) Since hemoglobin concentration is higher inside the cell, hemoglobin moves outward by exocytosis. (C) Since potassium ions are more concentrated inside the cells, potassium ions move outward by osmosis. (D) Erythrocytes pump water inw...
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