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BIOL 1000 F12 test 2 Section A V2.pdf
BIOL 1000 F12 test 2 Section A V2.pdf

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School
York University
Department
Biology
Course
BIOL 1500
Professor
Julie Clark
Semester
Winter

Description
Biol1000 Section A Fall 2012 – Test 2 BIOL 1000 3.0 Section A Test 2 Fall, 2012 This ENTIRE test package and scantron MUST be submitted to receive a grade Your STUDENT NUMBER and NAME must be clearly indicated on this package and scantron sheet to receive a grade Your STUDENT NUMBER must also be BUBBLED CORRECTLY in the scantron sheet to receive a grade There are 25 Multiple Choice Questions (1 mark each) and 1 short answer question (6 marks). Choose the BEST answer for each question. ELECTRONIC AIDS (e.g. calculators, phones iPods etc.) are NOT PERMITTED. ONLY THE SCANTRON WILL BE GRADED SO MAKE SURE YOU FILL IN THE ANSWER TO EACH QUESTION ON THE SCANTRON BEFORE THE ALLOTTED TIME FOR THE TEST IS UP. YOU WILL NOT BE PROVIDED EXTRA TIME TO DO SO. HAND IN QUESTION BOOKLET WITH SCANTRON. If you finish the test before the allotted time then please raise your hand and an invigilator will come and collect your test GOOD LUCK! Last name: Section First name: Student number: A 2 Page 1 of 7 Biol1000 Section A Fall 2012 – Test 2 1.What is the difference between simple and facilitated diffusion? A. Facilitated diffusion requires energy whereas simple diffusion does not. B. Simple diffusion moves a solute from an area of high concentration to low concentration whereas facilitated diffusion moves a solute from an area of low concentration to high concentration. C. Facilitated diffusion requires a transport protein whereas simple diffusion does not. D. A and C. 2.You are a scientist and are studying plant membrane lipids. You compare the lipid content of plant 1, which has been grown at 15 C with a related plant, plant 2, that has o been grown at 26 C. What do you expect to find? A. Plant 1 has higher levels of unsaturated fats than plant 2. B. Plant 1 has higher levels of saturated fats than plant 2. C. Plant 1 has higher levels of trans fats than plant 2. D. Plant 1 and plant 2 have similar levels of both saturated and unsaturated fats. 3.A cell is placed in a solution of growth medium that has a solute concentration of 0.10 M. The internal solute concentration of the cell is 0.21 M. Which of the following statements is true? A. The growth medium is hypertonic compared to the cytoplasm and the cell will shrink. B. The growth medium hypertonic compared to the cytoplasm and the cell will swell. C. The growth medium is isotonic compared to the cytoplasm and the cell will shrink. D. The growth medium is hypotonic compared to the cytoplasm and the cell will swell. E. The growth medium is isotonic compared to the cytoplasm and the cell will neither swell nor shrink. 4. What is the role of cholesterol in the cell membrane? A. Cholesterol decreases fluidity at low temperatures by helping to align saturated lipid tails. B. Cholesterol increases fluidity at low temperatures by decreasing the close packing of the fatty acid chains. C. Cholesterol serves as the main site of attachment for sugars that form glycolipids. D. No role: there is no cholesterol in membrane. 5.You have discovered a new ion pump that moves chloride into the cell (note chloride concentrations are lower outside the cell than inside the cell). The pump also hydrolyzes ATP. What have you most likely discovered? A. An ion channel. B. A peripheral protein that uses ATP to flip from one side of the membrane to the other when it binds chloride. C. A primary active transport protein. D. A secondary active transport protein. 6.How does water move across the cell membrane? A. It diffuses across the lipid bilayer. B. It is pumped across the bilayer by a protein channel that requires ATP. C. It diffuses through special protein channels embedded in the membrane using passive transport. D. A and C E. B and C F. A, B and C. Page 2 of 7 Biol1000 Section A Fall 2012 – Test 2 7. Which of the following best describes the graph above? A. This is an exergonic reaction, catabolic, and the entropy of the products is greater than the reactants. B. This is an exergonic reaction, anabolic, and the entropy of the products is lower than the reactants. C. This is an endergonic reaction, catabolic, and the entropy of the products is greater than the reactants. D. This is an endergonic reaction, anabolic, and the entropy of the products is lower than the reactants. E. This is an exergonic reaction, anabolic, and the entropy of the products is greater than the reactants. F. This is an endergonic reaction, anabolic, and the entropy of the products is greater than the reactants. 8. Which of the following molecules will diffuse most easily across the membrane using simple diffusion? A. water. B. glucose. C. oxygen. D. sodium. E. They should all move at the same rate. 9.Where would you expect to find the sugar component of a glycoprotein in a vesicle released from the Golgi and destined for the cell surface? A. It would be found extending inwards from the inner surface of the vesicle. B. It would be found extending into the cytoplasm from the outer surface of the vesicle. C. It would be found embedded in the hydrophobic region of the lipid bilayer. D. Since there is no sugar in a glycoprotein I would not expect to see any sugar component. Page 3 of 7 Biol1000 Section A Fall 2012 – Test 2 10.A tetraploid cell has 20 chromosomes. What is n? A. 4 B. 5 C. 10 D. 20 E. 40 F. None of the above. 11. Which of the following would best describe the structure of an integral membrane protein? A. Alpha-helix secondary structure with hydrophobic R-groups facing outward. B. Beta-sheet secondary structure with hydrophilic R-groups facing outward. C. Alpha-helix tertiary structure with hydrophilic R-groups facing outward. D. Beta-sheet primary structure with the hydrophobic backbone
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