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Campbell Biology Chapter 6 to 9 test preparation

front 1 1) In the fractionation of homogenized cells using centrifugation, the primary factor that determines whether a specific cellular component ends up in the supernatant or the pellet is the___. a) Percentage of carbohydrates in the component b) Presence or absence of lipids in the component c) Relative solubility of the component d) size and weight of the component	back 1 Answer: D
front 2 2) The advantage of light microscopy over electron microscopy is that___. a) Light microscopy allows one to view dynamic processes in living cells b) light microscopy provides for higher magnification than electron microscopy c) light microscopy provides higher contrast than electron microscopy d) light microscopy provides for higher resolving power than electron microscopy	back 2 Answer: A
front 3 3) Which of the following macro-molecules leaves the nucleus of a eukaryotic cell through pores in the nuclear membrane? a) DNA b) phospholipids c) glycogen d) mRNA	back 3 Answer: D
front 4 4) Large number of ribosomes are present in cells that specialize in producing which of the following molecules? a) Nucleic acids b) proteins c) glycogen d) lipids	back 4 Answer: B

front 5 5) The Golgi apparatus has a polarity, or sidedness to its structure and function. Which of the following statements correctly describes this polarity? a) Lipids in the membrane of the Golgi may be sorted and modified as they move from one side of the Golgi to the other b) Transport vesicles fuse with one side of the Golgi and leave from the opposite side c) proteins in the membrane of the Golgi may be sorted and modified as they move from one side of the Golgi to the other d) All of the listed responses correctly describe polarity characteristics of the Golgi function.	back 5 Answer: D
front 6 6) Cyanide binds with at least one molecule involved in producing ATP. If a cell is exposed to cyanide, most of the cyanide will be found within the___. a) Mitochondria b) lysosomes c) peroxisomes d) endoplasmic reticulum	back 6 Answer: A
front 7 7) The evolution of eukaryotic cells most likely involved__. a) Anaerobic archaea taking up residence inside a large bacterial host cell to escape toxic oxygen-the anaerobic bacterium evolved into chloroplasts b) acquisition of an endomembrane system and subsequent evolution of mitochondria from a portion of the Golgi c) endosymbiosis of an aerobic bacterium in a larger host cell – the endosymbiont evolved into mitochondria d) an endosymbiotic fungal cell evolving into the nucleus	back 7 Answer: C
front 8 8) Researches tried to explain how vesicular transport in cells by attempting to assemble the transport components. They set up microtubular tracks along which vesicles could be transported, and they added vesicles and ATP (because they knew the transport process requires energy). Yet, when they put everything together there was no movement or transport of vesicles. What were they missing? a) Endoplasmatic reticulum b) motor proteins c) contractile microfilaments d) an axon	back 8 Answer: D

front 9 9) The cell walls of bacteria, fungi, and plant cells an the extracellular matrix cells are all external to the plasma membrane. Which of the following is a characteristic common to all of these extracellular structures? a) They must block water and small molecules to regulate the exchange of matter and energy with their environment b) they are composed of a mixture of lipids and nucleotides c) they must provide a rigid structure that maintains an appropriate ratio of cell surface area to volume	back 9 Answer: B
front 10 10) Suppose a young boy is always tired and fatigued, suffering from a metabolic disease. Which of the following organelles is most likely involved in this disease? a) Golgi apparatus b) mitochondria c) ribosomes d) lysosomes	back 10 Answer: B
front 11 11) Spherocytosis is a human blood disorder associated with a defective cytokeletal protein in the blood cell (RBCs). What do you suspect is the consequence of such a defect? a) Abnormally shaped RBCs b) adherence of RBCs to blood vessel walls, causing plaque formation c) an insufficient supply of oxygen-transportation proteins in the RBCs d) an insufficient supply of ATP in the RBCs	back 11 Answer: A
front 12 12) H.V. Wilson worked with sponges to gain some insight into exactly what was responsible for holding adjacent cells together. He exposed two species of differently pigmented sponges to a chemical that disrupted the cell-cell interaction (cell junctions), and the cells of the sponges dissociated. Wilson then mixed the cells of the two species and removed the chemical that caused the cells to dissociate. Wilson found that the sponges reassembled into two separate species. The cells from one species did not interact or form associations with the cells of the other species. How do you explain the results of Wilson's experiments? a) One cell functioned as the nucleus for each organism, thereby attracting only cells of the same pigment b) The molecules responsible for cell-cell adhesion (cell junctions) were irreversibly destroyed during the experiment. c) The molecule responsible for cell-cell adhesion (cell junctions) differed between the two species of sponge d) The two species of sponge had different enzymes that functioned in the reassembly process.	back 12 Answer: C

front 13 13) For a protein to be an integral membrane protein, it would have to be __. a) exposed on only one surface of the membrane b) hydrophilic c) amphipathic, with at least one hydrophobic region d) hydrophobic	back 13 Answer: C
front 14 14) The membranes of winter wheat are able to remain fluid when it is extremely cold by___. a) Cotransport of glucose and hydrogen b) decreasing the number of hydrophobic proteins in the membrane c) increasing the percentage of cholesterol molecules in the membrane d) increasing the percentage of unsaturated phospholipids in the membrane.	back 14 Answer: D
front 15 15) Singer and Nicolson's fluid mosaic model of the membrane proposed that membranes____. a) consist of protein molecules embedded in a fluid bilayer of phospholipids. b) consist of a mosaic of polysaccharides and proteins. c) are a phospholipid bilayer between two layers of hydrophilic proteins. d) are a single layer of phospholipids and proteins.	back 15 Answer: A
front 16 16) An animal cell lacking oligosaccharides on the external surface of its plasma membrane would likely be impaired in which function? a) attaching the plasma to the cytoskeleton b) cell-cell recognition c) establishing the diffusion barrier to charged molecules d) transporting ions against an electrochemical gradient	back 16 Answer: B

front 17 For the following question, match the labeled component of the cell membrane in the figure with its description 17) Which component is a peripheral protein? a) A b) B c) C d) D	back 17 Answer: D
front 18 18) Which component is cholesterol? a) A b) B c) C d) D	back 18 Answer: D
front 19 19)Which of the following allows water to move faster across cell membranes? a) Aquaporins b) the sodium-potassium pump c) peripheral proteins d) ATP	back 19 Answer: A
front 20 20)Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly? a) An amino acid b) glucose c) K+ d) CO2	back 20 Answer: D

front 21 21) Which of the following processes includes all other? a) Passive transport b) transport of an ion down its electrochemical gradient c) osmosis d) facilitated diffusion	back 21 Answer: A
front 22 22) You are working on a team that is designating a new drug. For this drug to work, it must enter the cytoplasm of specific target cells. Which of the following would be a factor that determines whether the molecule selectively enters the target cells? a) Lipid composition of the target cell's plasma membrane b) similarity of the drug molecule to other molecules transported by the target cells c) hydrophobicity of the drug molecule d) lack of charge on the drug molecule	back 22 Answer: B
front 23 23) Which of the following is true of osmosis? a) Osmosis only takes place in red blood cells b) In osmosis, water moves across a membrane from areas of lower solute concentration to areas of higher solute concentration c) In osmosis, solutes move across a membrane from areas of lower water concentration to areas of higher water concentration d) Osmosis is an energy-demanding or “active” process	back 23 Answer: B
front 24 The solution in the two arms of this U-tube are separated by a membrane that is permeable to water and glucose but not to sucrose. Side A is half-filled with a solution of 2 M sucrose and 1 M glucose. Side B is half-filled with 1 M sucrose and 2 M glucose. Initially, the liquid levels on both sides are equal. 24) Refer to the figure. Initially, in terms of tonicity, the solution in side A with respect to that in side B is a) saturated b) hypertonic c) hypotonic. d) Isotonic	back 24 Answer: D

front 25 25) A patient was involved a serious accident and lost a large quantity of blood. In an attempt to replenish body fluids, distilled water - equal to the volume of blood lost – is added to the blood directly via one of his veins. What will be the most probable result of this transfusion? a) The patient's red blood cells will burst because the blood has become hypertonic compared to the cells. b) The patient's red blood cells will swell and possibly burst because the blood has become hypotonic compared to the cells. c) The patient's red blood cells will shrivel up because the blood has become hypotonic compared to the cells. d) The patient's red blood cells will shrivel up because the blood has become hypertonic compared to the cells.	back 25 Answer: B
front 26 26) Most cells cannot harness heat to perform work because___ a) heat is not a form of energy b) heat can never be used to do work c) heat must remain constant during work d) temperature is usually uniform throughout a cell	back 26 Answer: D
front 27 27) Which of the following involves a decrease in entropy? a) Reactions that separate monomers b) depolymerization reactions c) hydrolysis reactions d) condensation reactions	back 27 Answer: C
front 28 28)Which of the following statements is a logical consequence of the second law of thermodynamics? a) Every chemical reaction must increase the total entropy of the universe b) energy can be transferred or transformed, but it cannot be created o destroyed c) if the entropy of a system increases there must be a corresponding decrease in the entropy of the universe d) if there is an increase in the energy of a system, there must be a corresponding decrease in the energy of the rest of the universe	back 28 Answer: A

front 29 29) Which of the following types of reactions would decrease the entropy within the cell? a) Catabolic reactions b) digestion c) anabolic reactions d) hydrolysis	back 29 Answer: C
front 30 30) Biological evolution of life on Earth, from simple prokaryote-like cells to large multicellular eukaryotic organisms ___. a) has occurred in accordance with the laws of thermodynamics. b) has been made possible by expending Earth's energy resources. c) has occurred in accordance with the laws of thermodynamics, by expending Earth's energy resources and causing an increase in the entropy of the planet. d) has caused an increase in the entropy of the planet.	back 30 Answer: A
front 31 31) You have discovered an enzyme that can catalyze two different chemical reactions. Which of the following is most likely to be corrected? a) Either the enzyme has two distinct active sites or the reactants involved in the two reactions are very similar in size and shape. b) The enzyme is subject to competitive inhibition and allosteric regulation. c) The enzyme contains α-helices and β-pleated sheets. d) Two types of allosteric regulation occur: The binding of one molecule activates the enzyme, while the binding of a different molecule inhibits it.	back 31 Answer: A
front 32 32) A chemical reaction that has a positive G is best described as____. a) Spontaneous b) exergonic c) endergonic d) enthalpic	back 32 Answer: C

front 33 33) The active site of an enzyme is the region that____ a) is inhibited by the presence of a co-enzyme or a co-factor b) binds noncompetitive inhibitors of the enzyme c) is involved in the catalytic reaction of the enzyme. d) binds allosteric regulators of the enzyme.	back 33 Answer: C
front 34 Rate of an enzyme-catalyzed reaction as a function of varying reactant concentration, with the concentration of enzyme constant 34) In the figure, why does the reaction rate plateau at higher reactant concentrations? a) The reaction nears equilibrium at high reactant concentrations. b) Feedback inhibition by product occurs at high reactant concentrations. c) Most enzyme molecules are occupied by substrate at high reactant concentrations. d) The rate of the reverse reaction increases with reactant concentration.	back 34 Answer: C
front 35 35) You collected data on the effect of pH on the function of the enzyme catalase in human cells. Which of the following graphs would you expect? a) A b) B c) C d) D	back 35 Answer: A
front 36 36) Substrate level phosphorylation occurs___ a) in glycolysis b) in the citric acid c) during oxidative phosphorylation d) in both glycolysis and the citric acid	back 36 Answer: D

front 37 37) Which of the listed statements describes the results of the following reaction? C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + Energy a) CO2 is reduced and O2 is oxidized. b) C6H12O6 is oxidized and O2 is reduced. c) O2 is reduced and CO2 is oxidized. d) O2 is oxidized and H2O is reduced.	back 37 Answer: B
front 38 38) When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom (not a proton), the molecule becomes_____. a) Redoxed b) dehydrogenated c) oxidized d) reduced	back 38 Answer: D
front 39 39) Which of the following statements about NAD+ is true? a) Is the absence of NAD+, glycolysis can still function b) NAD+ has more chemical energy than NADH c) NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle d) NAD+ can donate electron for use in oxidative phosphorilation	back 39 Answer: C
front 40 40) Substrate-level phosphorylation accounts for approximately what percentage of the ATP formed by the reactions of glycolysis? a) 100% b) 0% c) 38% d) 2%	back 40 Answer: A

front 41 41) In glycolysis, for each molecule of glucose oxidized to pyruvate____ a) two molecules of ATP are used and six molecules of ATP are produced. b) two molecules of ATP are used and four molecules of ATP are produced. c) two molecules of ATP are used and two molecules of ATP are produced. d) four molecules of ATP are used and two molecules of ATP are produced.	back 41 Answer: B
front 42 42) Carbon dioxide (CO2) is released during which of the following stages of cellular respiration? a) glycolysis and the oxidation of pyruvate to acetyl CoA b) oxidative phosphorylation and fermentation c) oxidation of pyruvate to acetyl CoA and the citric acid cycle d) fermentation and glycolysis	back 42 Answer: C
front 43 43) During aerobic respiration H2O is formed. Where does the oxygen atom for the formation of the water come from? a) pyruvate (C₃H₃O₃-) b) glucose (C₆H₁₂O₆) c) molecular oxygen (O₂) d) carbon dioxide (CO₂)	back 43 Answer: C
front 44 44) The primary role of oxygen in cellular respiration is to ____ a) combine with lactate forming pyruvate b) combine with carbon, forming CO2 c) yield energy in the form of ATP as it is passed down the respiratory chain d) act as an acceptor for electron and hydrogen, forming water	back 44 Answer: D

front 45 45) Where are the proteins of the electron transport chain located? a) mitochondrial inner membrane b) mitochondrial matrix c) mitochondrial outer membrane d) mitochondrial intermembrane space	back 45 Answer: A
front 46 Use the following figure to answer the questions below. 46) Starting with citrate, which of the following combinations of products would result from three acetyl CoA molecules entering the citric acid cycle ( see the accompanying figure)? a) 3 ATP, 6 CO₂, 9 NADH, and 3 FADH₂ b) 1 ATP, 2 CO₂, 3 NADH, and 1 FADH₂ c) 38 ATP, 6 CO₂, 3 NADH, and 12 FADH₂ d) 3 ATP, 3 CO₂, 3 NADH, and 3 FADH₂	back 46 Answer: A
front 47 47) Which of the following events tales place in the electron transport chain? a) substrate-level phosphorylation b) breakdown of glucose into two pyruvate molecules. c) the breakdown of an acetyl group to carbon dioxide d) the extraction of energy from high-energy electrons remaining from glycolysis and the citric acid cycle	back 47 Answer: D
front 48 48) You have a friend who lot 7 kg (about 15 pounds) of fat on a regimen of strict diet and exercise. How did the fat leave his body? a) It was converted to ATP, which weighs much less than fat. b) It was converted to urine and eliminated from the body. c) It was converted to heat and then released. d) It was released as CO₂ and H₂O.	back 48 Answer: D

front 49 49) Chemiosmotic ATP synthesis (oxidative phosphorylation) occurs in ____ a) only in mitochondria, using either oxygen or other electron acceptors. b) all cells, but only in the presence of oxygen. c) all respiring cells, both prokaryotic and eukaryotic, using either oxygen or other electron acceptors. d) only eukaryotic cells, in the presence of oxygen.	back 49 Answer: C
front 50 50) Which of the following normally occurs regardless of whether or not oxygen (O2) is present? a) Glycolysis b) oxidative phosphorylation (chemiosmosis) c) citric acid cycle d) fermentation	back 50 Answer: A
front 51 51) What part of the cell is essential to aerobic respiration? a) Ribosomes b) mitochondrion c) endoplasmatic reticulum d) nucleus	back 51 Answer: B