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Bio188 Exam 1

Bio188 Exam 1 - BIO 188 EXAM I Version A coproteins on the...

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Unformatted text preview: BIO 188 EXAM I Version A coproteins on the cell membrane enable a cell to be recognized by other cells 18 True 2. Which of the following components is found in a prokaryotic cell? A) mitochondria B chloroplasts @ ribosomes D) endoplasmic reticulum E) nuclear envelope 3. A shallow pan is filled with water and a drop of red ink is placed in one end of the pan and a drop of green ink in the other end. The drops of ink are allowed to diffuse. Which of the following is true AT EQUILIBRIUM? A) The red ink is unifomly distributed in one-half of the pan, and the green ink is uniformly distributed in the other half of the pan. ' ® The red and green inks are uniformly distributed throughout the pan. C) Each ink is moving down its concentration gradient. D) The concentration of each ink is higher at one end of the pan than at the other end. E) No predictions can be made without knowing the molecular weights of the ink molecules. 4. The key event(s) that allows a cell to progress beyond the restriction point is (are) A) cyclin B binding to Cdkl B) p53 protein binding to cyclin D C) cyclin A binding to Cdk2 @ phosphorylation of Rh protein by cyclin-bound Cdk4 and Cdk2 E) completion of mitosis 5. In eukaryotes DNA replication occurs A) during both mitosis and meiosis B) only during mitosis C) during G1 phase @ during the S phase. E) during G2 phase I Page 1 6. Which of the following statements about a scientific hypothesis IS NOT correct A) it is usually stated in the form of a question B) it does not necessarily have to be associated with a test of a scientific theory Q it is formulated after the experiment has been completed it may be used to test for causality (e.g., agent A causes disease B) E) C and D 7. Active transport usually moves molecules A) in the same direction as diffusion moves them.- (§ in the opposite direction in which diffusion moves them. in a direction that tends to bring about equilibrium. D) toward higher pH. E) toward higher osmotic potential. 8. What is the trigger for a cell to move from G2 phase to mitosis? A) - passage of the cell through the spindle assembly checkpoint B) passage of the cell through the restriction checkpoint @ the accumulation of Survivin D) replication of DNA E) repair of DNA damage 9. The fundamental unit of life is the A) organelle . ' B) multicellular organism C) cell membrane D mitochondrion cell 10. Which cell structure sorts and packages proteins in the cell: A) cell nucleus B) rough endoplasmic reticulum (ER) C) smooth ER D) plasma membrane ® Golgi apparatus 11. Membrane fluidity ' ® refers to the viscosity (i.e., ability to change shape) of the plasma membrane B) long fatty acid tails increase fluidity C) saturated fatty acid tails increase fluidity D) increasing temperature decreases fluidity E) all of the above Page 2 12. The purpose of the NaJVK+ ion pump is to: *A) <33 D) E) keep all Na+ ions out of the cell and all K+ ions inside the cell maintain Na+ and KP ion gradients across the cell membrane keep all Na+ ions inside the cell and all K+ ions outside of the cell maintain an equal number of Na" ions outside of the cell and K+ inside of the cell maintain ion equilibrium across the cell membrane 13. Which statement about ion channels is false? A) B) D) E) They form pores in the membrane. They are proteins. All ions pass through the same channel. Movement through them is from high concentrations to low concentrations. Movement through them is by simple diffusion. 14. What distinguishes living organisms from non-living matter? A) B) C) D) ® only living organisms increase in size only living organisms change in response to their environment only living organisms are composed of molecules living organisms obey special life laws different flom physical laws of nature only living organisms are characterized by the processes of metabolism, reproduction and evolution 15. The movement of sodium ions from an area of higher concentration to an area of lower concentration is called A) B) C) @3 E) active transport osmosis pinocytosis diffusion phagocytosis 16. The process by which materials packaged in vesicles are released into the extracellular environment is called: A) symbiosis ® exocytosis C) D) E) endocytosis phagocytosis pinocytosis Page 3 17. Which statement is true about the differences between cilia and flagella? A cilia are longer than flagella there are more cilia on a cell than flagella C) flagella beast in one direction; cilia move in multiple directions D) B and C E) none of the above, cilia are the same as flagella. 18. In biological membranes, the phospholipids are arranged in a A) bilayer, with the phosphate groups in the interior of the membrane B) bilayer, with the fatty acids facing outward C) single layer, with the fatty acids facing the interior of the cell D) single layer, with the phosphorus— —containing region facing the interior of the cell @ bilayer, with the fatty acids pointing toward each other 19. Why are cells so small? A) cell volume determines the rate materials leave or enter the cell B) cell surface area increases faster than cell surface area as cell gets larger (C2)") if cell IS too large cellular activities cannot be supported by rate of exchange of ' materials with environment D) A and B E) A and C _ 20. Which of the following processes includes all others? I A) osmosis B) diffusion of a solute across a membrane C) facilitated diffusion @ passive transport ' E) transport of an ion down its electrochemical gradient 21. Osmosis requires the presence of a semi—permeable membrane. @ true ' B) false 22. What do chloroplasts and mitochondria have in cemmon? A both are present in animal cells 6 both contain their own DNA . C) both are present in all eukaryotic cells D) both are present in all plant cells E) both are present in all prokaryotic cells Page 4 23. The LDL receptor is a transmembrane protein. The amino acid side chains in the region of the protein that crosses the lipid bilayer of the membrane are most likely to be: A) hydrophilic B charged hydrophobic D) carbohydrates E) lipids 24. When placed in a hypertonic solution, animal cells A) begin to divide ' B) swell ' C) burst , D transport water out E shrink 25. When cyclin binds Cdk, A) the cell transitions from G2 to S. ) kinase activation occurs. chromosomes condense. D) the cell quickly enters M phase. - E) the cell begins apoptosis. 26. Ribosomes are not Visible under a light microscope, but they can be seen with an electron microscope because ' ' A) electron beams have more energy than light beams. B) electron microscopes focus light with magnets. @ electron microscopes have mere resolving power than light microscopes. D) electrons have such high energy that they pass through biological samples. E) living cells can be observed under the electron microscope. 27. Which of the following membrane transport mechanisms requires energy? A) facilitated diffusion B simple diffusion ' 6 active transport D) osmosis E) all require energy Page 5 28. Peripheral membrane proteins do not penetrate the membrane lipid bilayer because they: A) are three—dimensional ' B) are too small C) are too large D) are bipolar - ® lack hydrophobic regions 29. Mature nerve cells, which are incapable of cell division, are in A) G1 phase B) S phase C) G2 phase D) mitosis @ G0 phase 30. The first person to see bacteria was: A) Virchow B Mossman Von Leeuwenhoek D) Pasteur E) Schwann 31. Osmosis is - ® the diffiision of water across membranes. B) . the active transport of water across membranes. C) unidirectional diffusion of water across membranes. D) unaffected by solute concentrations inside cells. E) an energy-requiring process. 32. Which of the following is true about the nucleoid‘? it contains a single circular loop of DNA B) it is found in both eukaryotes and prokaryotes C) it is anchored to the plasma membrane D) A and B E) A and C 33. Exocytosis involves A) ingestion of large organic molecules or organisms B) the use of ATP , C) the uptake of fluids from the environment . C? the discharge of materials into the environment from cellular vesicles B andC Page 6 34. Which eukaryotic organelle protects the cell from toxic peroxides“ A vacuoles peroxisomes C) ribosomes D) nucleosomes E) mitochondria '35. The p21 protein stops the cell cycle by specifically blocking ' A) formation of the mitotic spindle - B) cyclin B E) cyclinA 36. How does a nucleus in G2 differ from a nucleus in G1? , a) The G2 nucleus has double the amount of DNA as the G1 nucleus. '3') DNA synthesis occurs only in the G1 phase. ' C) ' Inactive cells are arrested only in the G2 phase. ' D) During G2, the cell prepares for S phase. _ . _ g B) All of the above ' I” - l C DNA synthesis 7 _ ' ‘ cyclin D ' _ , 37. During prokaryotic cell division, two chromosomes separate from each other and I distribute into the daughter cells by ' A) attachment to microtubules. ' B) a. mitotic spindle. C) repellent forces. ([33) attachment to separating membrane regions. E) All of the above l 38. Secondary active transport requires A) lipid rafts in the phospholipid by-layer B) ATP as a direct source of energy (9 energy supplied by an ion concentration gradient established by primary active transport D) no energy E) no electrochemical gradient Page 7 '3 9. The cells of the intestinal epithelium are linked together in order to prevent substances from passing between them. The type of cell junction linliing these cells is called tight junction ' B) gap junctiOn I C) desmosome D) ionchanel E) facilitated transporter 40. Cancer cells are characterized by uncontrolled cell growth because they A) evade apoptosis - - B) have defective cell cycle control C) are immortal D) are genetically unstable @ all of the above 41. Integral membrane proteins have both hydrOphilic and hydIOphobic regions. True B) False 42. The nuclear DNA of a eukaryotic cell is double—stranded single-stranded C circular _ D) complex inverted E) conservative 43. A membrane channel protein allows for the simultaneous movement of K+ out of the cell and Na+ into the cell. This is an example of a A) uniport B) duo—port C) symport (g1 antiport E) divalent port 44. Cholesterol molecules act to A) help hold a membrane together. 3) transport ions across membranes. C) attach to carbohydrates. D) disrupt membrane function. ® alter the fluidity ofthe membrane. _ Page 8 45. Which structure(s) in the eukaryotic cell contain(s) DNA? A) cell nucleus B) rough endoplasmic reticulum C mitochondria A and C E) A, B and C ' 46. Which type of cell would probably provide the best opportunity to study lysozomes? ' A) muscle cell B) leaf cell of a plant C) nerve cell I D bacterial cell _ phagocytic white blood cell _ 47. A bacterial cell gives rise to two genetically identical daughter cells by a process known as A) nondisj unction. B) mitosis. C) meiosis. @ fission. ' E) fertilization. 48. After completing mitosis eukaryotic cells immediately move into G1 phase. ' 49.‘ Stem cells from adult tissues can be stimulated to 'make'any other tissue in the body. A __ True .3) False 50.- A new organelle has been discovered in intestinal crypt cells. The organelle is 1 pm in I its largest dimension. Three microscopes are available to study the new organelle. Microscope A has a resolution of 0.1um; microscope B has a resolution 'Of 2 pm, and microscope C has a resolution of 10pm. Which microscope(s) can be used to study the new organelle? A) all three ® microscope A C) microscope B D) microscope C E) microscope A or B. Page 9 ...
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