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Practice AP Multiple Choice Exam 1 Do NOT write on this! 1. Which of the following is responsible for the cohesive property of water? a. hydrogen bonds between the oxygen atoms of two adjacent water molecules b. covalent bonds between the hydrogen atoms of two adjacent water molecules c. hydrogen bonds between the oxygen atom of one water molecule and a hydrogen atom of another water molecule d. covalent bonds between the oxygen atom of one water molecule and a hydrogen atom of another water molecule e. hydrogen bonds between water molecules and other types of molecules Questions 2-5 refer to the following groups of biological compounds: a. proteins b. carbohydrates c. nucleic acids d. lipids e. steroids 2. Synthesized at the ribosome, includes enzymes 3. Includes glycogen, chitin, cellulose, and glucose. 4. Used for insulation and buoyancy in marine Arctic animals 5. Used to carry the genetic code 6. About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter? A. B. C. D. E. Carbon, sodium, chlorine, nitrogen Carbon, sulfur, phosphorus, hydrogen Oxygen, hydrogen, calcium, sodium Carbon, hydrogen, nitrogen, oxygen Carbon, oxygen, sulfur, calcium 7. Different atomic forms of an element contain the same number of protons but a different number of neutrons. What are these different atomic forms called? A. B. C. D. E. Ions Isotopes Neutronic atoms Isomers Radioactive atoms 1 Practice AP Multiple Choice Exam 1 Do NOT write on this! 8. Atoms whose outer electron shells contain eight electrons tend to A. B. C. D. E. Form ionic bonds in aqueous solutions Form covalent bonds in aqueous solutions Be stable and chemically nonreactive, or inert. Be unstable and chemically very reactive. Be isotopes and very reactive. 9. What results from an unequal sharing of electrons between atoms? A. B. C. D. E. A nonpolar covalent bond. A polar covalent bond. An ionic bond. A hydrogen bond. A hydrophobic interaction. 10. The following explains most specifically the attraction of water molecules to one another A. B. C. D. E. Nonpolar covalent bond Polar covalent bond Ionic bond Hydrogen bond Hydrophobic interaction 11. Why does liquid ice float in water? A. The liquid water molecules have more kinetic energy and thus support the ice. B. The ionic bonds between the molecules in ice prevent the ice from sinking. C. Ice always has higher oxygen content inside that keep it afloat. D. Hydrogen bonds stabilize and keep the molecules of ice farther apart than the water molecules of liquid water. E. The crystalline lattice of ice causes it to be denser than liquid water. 12. In a neutral solution the concentration of A. B. C. D. E. Hydrogen ions is equal to the concentration of hydroxide ions Water molecules is less than the concentration of hydrogen ions Hydrogen ions is less than the concentration of hydroxide ions Water molecules is less than the concentration of hydroxide ions Hydrogen ions is greater than the concentration of hydroxide ions 2 Practice AP Multiple Choice Exam 1 Do NOT write on this! 13. Which property of the carbon atom gives it compatibility with a greater number of different elements than any other type of atom? A. carbon has 6 to 8 neutrons B. carbon has 4 electrons in its outer shell C. carbon forms ionic bonds D. A and C only E. None of the above 14. Polymers of polysaccharides, fats, and proteins are all synthesized from monomers by which process? A. connecting monomers through condensation reactions B. the addition of water to each monomer C. connecting monomers through the removal of water by dehydration synthesis D. ionic bonding of the monomers E. the formation of disulfide bridges between monomers 15. Which type of interaction stabilizes the alpha helix and the beta pleated sheet structures of proteins? A. hydrophobic interactions B. nonpolar covalent bonds C. ionic bonds D. hydrogen bonds E. peptide bonds 16. All of the following nitrogenous bases are found in DNA except A. thymine B. adenine C. uracil D. guanine E. cytosine 17. Which of the following is not a protein? A. hemoglobin B. cholesterol C. an antibody D. an enzyme E. insulin 3 Practice AP Multiple Choice Exam 1 Do NOT write on this! 18. Saturated fatty acids A are the predominant fatty acid in corn oil B. have double bonds between carbon atoms of the fatty acids C. have more hydrogen atoms than unsaturated fatty acids D. are usually liquid at room temperature E. are usually produced by plants 19. Compared to 31P, the radioactive isotope 32P has a. a different atomic number b. one more neutron c. one more proton d. one more electron e. a different charge 20. The sodium and the calcium atoms in salt (NaCl) are held together by __________________ bonds. a. covalent b. ionic c. hydrogen d. peptide e. polar covalent 21. Which of the following is an example of a hydrophobic material? a. paper b. table salt c. wax d. sugar e. pasta 22. Acid precipitation has lowered the pH of a particular lake to 4.0. What is the hydrogen ion concentration of the lake? a. 4.0 M b. 10-10 M c. 10-4 M d. 104 M e. 4% 4 Practice AP Multiple Choice Exam 1 Do NOT write on this! 23. Cell membranes are primarily composed of a. proteins b. carbohydrates c. phospholipids d. amino acids e. nucleic acids 24. Choose the term that correctly describes the relationship between glucose and sucrose (same number of atoms, different arrangements) a. structural isomers b. geometric isomers c. enantiomers d. isotopes e. polypeptides 25. What is the pH of a solution with a hydrogen ion [H+] concentration of 10-8 M? A) pH 2 B) pH 4 C) pH 6 D) pH 8 E) pH 10 26. Which of the following solutions has the greatest concentration of hydroxyl ions [OH]? A) lemon juice at pH 2 B) vinegar at pH 3 C) tomato juice at pH 4 D) urine at pH 6 E) seawater at pH 8 27. There are 20 different amino acids. What makes one amino acid different from another? A) different carboxyl groups attached to an alpha (α) carbon B) different amino groups attached to an alpha (α) carbon C) different side chains (R groups) attached to an alpha (α) carbon D) different alpha (α) carbons E) different asymmetric carbons 5 Practice AP Multiple Choice Exam 1 Do NOT write on this! Questions 28-32 refer to the following diagram of a plant cell. 28. Site of glucose synthesis. 29. Site of conversion of chemical energy of glucose to ATP. 30. Site of modification and packaging of proteins and lipids prior to export from the cell. 31. Site of transport of materials into and out of the cell. 32. Evolved from a photosynthetic prokaryote. 6 Practice AP Multiple Choice Exam 1 Do NOT write on this! 33. While studying a cell with the electron microscope; a scientist notes the following: numerous ribosomes, a well-developed endoplasmic reticulum, chloroplasts, and a cell wall. Which of the following could be the source of this cell? a. a fungus b. an animal c. a bacterium d. a plant e. a virus 34. Which of the following assembles ribosomal precursors? a. centriole b. Lysosome c. nucleolus d. peroxisome e. ribosomes 35. Which of the following contains hydrolytic enzymes associated with the intracellular digestion of macromolecules? a. centriole b. Lysosomes c. nucleolus d. peroxisome e. ribosomes 36. The function of which of the following organelles directly requires oxygen? a. ribosome b. mitochondrion c. nucleus d. centriole e. golgi apparatus 37. A prokaryotic cell has which of the following? a. centriole b. Lysosomes c. plasma membrane d. mitochondria e. endoplasmic reticulum 7 Practice AP Multiple Choice Exam 1 Do NOT write on this! Questions 38-40 refer to the graph below, which illustrates the percent change in the mass of pieces of plant tissue placed in solutions of different sucrose molarities. 38. Which of the following occurs in tissue that is placed in 0.6M sucrose? a. the cells become turgid. b. the cells burst. c. the volume of the vacuoles decreases. d. the volume of the cytoplasm increases. e. the cells remain the same as before. 39. The approximate molarity of the solution in which the mass of the plant pieces would NOT change is a. 0.0 M b. 0.1 M c. 0.3 M d. 0.5 M e. 0.7 M 40. Water enters and leaves plant cells primarily by a. endocytosis b. phagocytosis c. osmosis d. active transport e. facilitated diffusion 8 Practice AP Multiple Choice Exam 1 Do NOT write on this! 41. The organelle that is a major producer of ATP and is found in both heterotrophs and autotrophs is the A. chloroplast B. nucleus C. ribosome D. Golgi apparatus E. mitochondrion 42. All of the following cell components are found in prokaryotic cells EXCEPT A. DNA B. ribosomes C. cell membrane D. nuclear envelope E. enzymes 43. If plant cells are immersed in distilled water, the resulting movement of water into cells is called: A. conduction B. active transport C. transpiration D. osmosis E. facilitated diffusion 44. Which of the following is the primary role of the lysosome? A. ATP synthesis B. Intracellular digestion C. Lipid transport D. Carbohydrate storage E. Protein synthesis Questions 45-47 refer to the diagram of the plasma membrane below. 45. Hydrophilic portion of lipid molecule. 9 Practice AP Multiple Choice Exam 1 Do NOT write on this! 46. Cell-recognition component. 47. Carriers or enzymes involved in cell transport. 48. Which of the following organelles modifies and packages for secretion the materials produced by the ribosomes? A. The chloroplast B. The Golgi apparatus C. The nucleus D. The nucleolus E. The mitochondrion 49. A student using a light microscope observes a cell and correctly decides that it is a plant cell because A. ribosomes are visible B. an endoplasmic reticulum can be seen C. a cell membrane is present D. it has a large central vacuole E. centrioles are present 50. Which of the following are involved in energy production for the cell? a. endoplasmic reticulum b. mitochondria c. golgi body d. nucleus e. nucleolus 51.The presence of cholesterol in the plasma membranes of some animals A) enables the membrane to stay fluid more easily when cell temperature drops. B) enables the animal to remove hydrogen atoms from saturated phospholipids. C) enables the animal to add hydrogen atoms to unsaturated phospholipids. D) makes the membrane less flexible, allowing it to sustain greater pressure from within the cell. E) makes the animal more susceptible to circulatory disorders. 52) What kinds of molecules pass through a cell membrane most easily? A) large and hydrophobic B) small and hydrophobic C) large polar D) ionic E) monosaccharides such as glucose 53) Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly? 10 Practice AP Multiple Choice Exam 1 Do NOT write on this! A) CO2 B) an amino acid C) glucose D) K+ E) starch 54) Water passes quickly through cell membranes because A) the bilayer is hydrophilic. B) it moves through hydrophobic channels. C) water movement is tied to ATP hydrolysis. D) it is a small, polar, charged molecule. E) it moves through aquaporins in the membrane. Read the following information and refer to Figure 7.4 to answer questions 55 & 56. Five dialysis bags, constructed from a semi-permeable membrane that is impermeable to sucrose, were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags were massed (weighed) and the percent change in mass of each bag was graphed. Figure 7.4 55) Which line represents the bag that contained a solution isotonic to the 0.6 molar solution at the beginning of the experiment? 56) Which line represents the bag with the highest initial concentration of sucrose? 57) Which of the following is a major cause of the size limits for certain types of cells? A) the evolution of larger cells after the evolution of smaller cells 11 Practice AP Multiple Choice Exam 1 Do NOT write on this! B) the difference in plasma membranes between prokaryotes and eukaryotes C) the evolution of eukaryotes after the evolution of prokaryotes D) the need for a surface area of sufficient area to allow the cell's function E) the observation that longer cells usually have greater cell volume 58) The liver is involved in detoxification of many poisons and drugs. Which of the following structures is primarily involved in this process and therefore abundant in liver cells? A) rough ER B) smooth ER C) Golgi apparatus D) Nuclear envelope E) Transport vesicles 59) Which of the following is a compartment that often takes up much of the volume of a plant cell? A) lysosome B) vacuole C) mitochondrion D) Golgi apparatus E) peroxisome A + B + Energy AB 60. Which of the following best characterizes the reaction represented above? a. Hydrolysis b. Catabolism c. Oxidation-Reduction d. Exergonic Reaction e. Endergonic Reaction 61. In a mesophyll cell of a leaf, the synthesis of ATP occurs in which of the following? I. Ribosomes II. Mitochondria III. Chloroplasts a. I only b. II only c. III only d. II and III only e. I, II, and III 62. During respiration, most ATP is formed as a direct result of the net movement of 12 Practice AP Multiple Choice Exam 1 Do NOT write on this! a. potassium against a concentration gradient b. protons down a concentration gradient c. electrons against a concentration gradient d. electrons through a channel e. sodium ions into the cell 63. Which of the following processes is carried out more efficiently by a C4 plant than a C3 plant? a. light absorption b. chemiosmotic coupling c. photolysis d. fixation of CO2 e. transport of sugar 64. Which of the following pathways for the transformation of cellular energy most likely evolved first? a. Cyclic photophosphorylation b. Citric acid (Kreb’s) cycle c. Calvin Cycle d. C4 photosynthesis e. Glycolysis 65. On a sunny day, the closing of stomata in plant leaves results in a. a decrease in CO2 intake b. a shift from C3 photosynthesis to C4 photosynthesis c. an increase in transpiration d. an increase in the concentration of CO2 in mesophyll cells e. an increase in the rate of production of starch 66. A biologist isolates numerous tiny, green-pigmented cells from a sample of lake water. The cells are covered with a mucilaginous sheath. They contain relatively large amounts of chlorophyll a and phyobilin pigments and lack a compact, organized nucleus. Electron microscopy will reveal that these cells also contain which of the following pairs of structures? a. ribosomes and chloroplasts b. ribosomes and mitochondria c. golgi bodies and a cell wall d. thylakoids and a cell wall e. chloroplasts and mitochondria 67. Which of the following processes is coupled with the hydrolysis of ATP? a. facilitated diffusion 13 Practice AP Multiple Choice Exam 1 Do NOT write on this! b. active transport c. chemiosmosis d. osmosis e. Na+ influx into the cell Questions 68-71 refer to the following graph. The solid curve and the dashed curve represent alternate pathways for the same reaction. One pathway is enzyme catalyzed. 68. Represents the activation energy of the enzyme-catalyzed reaction. 69. Represents the net energy change of the reaction. 70. Represents the energy state of the products of the enzyme-catalyzed pathway. 71. Represents the energy state of the products of the pathway that is not enzyme catalyzed. Questions 72-76 14 Practice AP Multiple Choice Exam 1 Do NOT write on this! A. Glycolysis B. Krebs Cycle (Citric Acid Cycle) C. Calvin Cycle (light-independent reactions of photosynthesis) D. Light-dependent reactions of photosynthesis E. Chemiosmosis 72. Process in which O2 is released as a by-product of redox reactions. 73. Process in which CO2 is released as a by-product of redox reactions. 74. Process in which carbon from CO2 is incorporated into other organic molecules. 75. Process found in both photosynthesis and cellular respiration. 76. Process in which sugar is oxidized to pyruvic acid. 77. The end products of the light-dependent reactions of photosynthesis are a. ADP, H2O, NADPH2 b. ADP, PGAL, RuBP c. ATP, CO2, H2O d. ATP, NADPH2, O2 e. CO2, H+, PGAL 78. Which of the following enzymes is responsible for CO2 fixation in C3 plants? a. Succinate dehydrogenase b. Rubisco c. Hekokinase d. Amylase e. PEP carboxylase 79. All energy on Earth ultimately comes from a. ATP b. Glucose c. Oxygen d. The sun e. plants 80. Which of the following statements is true about the Krebs (citric acid) cycle and the Calvin (light-independent) cycle? a. They both result in a net production of ATP and NADH. b. They both require a net input of ATP c. They both result in a release of oxygen d. They both take place in the cytoplasm of a cell e. They are both carried out by enzymes located within an organelle matrix 81. The function of water in photosynthesis is to a. combine with CO2 15 Practice AP Multiple Choice Exam 1 Do NOT write on this! b. absorb light energy c. supply electrons in the light-dependent reactions d. transport H+ ions in the light-dependent reactions e. provide O2 for the light-dependent reactions Questions 82-83 refer to an experiment that is set up to determine the relative volume of O2 consumed by germinating and nongerminating (dry) pea seeds at two different temperatures. The change in volume is detected using a respirometer over a given period o time. The data are given below. 82. The rate of oxygen consumption in germinating pea seeds at 26°C is a. 0.05 mL/min b. 0.25 mL/min c. 0.50 mL/min d. 0.75 mL/min e. 1.00 mL/min 83. Which of the following conclusions is best supported by the data? a. Nongerminating pea seeds have a higher rate of respiration than germinating pea seeds do. b. Light is required for pea seed germination. c. In the nongerminating pea seeds, oxygen consumption is directly proportional to oxygen concentration. d. Less carbon dioxide is produced by germinating pea seeds at 26°C than at 10°C. e. In pea seeds, an increase in temperature results in an increase in oxygen consumption. 84) What term is used to describe the transfer of free energy from catabolic pathways to anabolic pathways? 16 Practice AP Multiple Choice Exam 1 Do NOT write on this! A) feedback regulation B) bioenergetics C) energy coupling D) entropy E) cooperativity 85) How can one increase the rate of a chemical reaction? A) Increase the activation energy needed. B) Cool the reactants. C) Decrease the concentration of the reactants. D) Add a catalyst. E) Increase the entropy of the reactants. 86) Reactants capable of interacting to form products in a chemical reaction must first overcome a thermodynamic barrier known as the reaction's A) entropy. B) activation energy. C) endothermic level. D) heat content. E) free-energy content. 87) Which of the following statements regarding enzymes is true? A) Enzymes decrease the free energy change of a reaction. B) Enzymes increase the rate of a reaction. C) Enzymes change the direction of chemical reactions. D) Enzymes are permanently altered by the reactions they catalyze. E) Enzymes prevent changes in substrate concentrations. 88) Zinc, an essential trace element for most organisms, is present in the active site of the enzyme carboxypeptidase. The zinc most likely functions as a(n) A) competitive inhibitor of the enzyme. B) noncompetitive inhibitor of the enzyme. C) allosteric activator of the enzyme. D) cofactor necessary for enzyme activity. E) coenzyme derived from a vitamin. 89) How does a noncompetitive inhibitor decrease the rate of an enzyme reaction? A) by binding at the active site of the enzyme B) by changing the shape of an enzyme C) by changing the free energy change of the reaction D) by acting as a coenzyme for the reaction E) by decreasing the activation energy of the reaction 90) Where does glycolysis takes place? 17 Practice AP Multiple Choice Exam 1 Do NOT write on this! A) mitochondrial matrix B) mitochondrial outer membrane C) mitochondrial inner membrane D) mitochondrial inter membrane space E) cytosol 91) Which of the following intermediary metabolites enters the citric acid cycle and is formed, in part, by the removal of a carbon (CO2) from one molecule of pyruvate? A) lactate B) glyceraldehydes-3-phosphate C) oxaloacetate D) acetyl CoA E) citrate 92) During aerobic respiration, electrons travel downhill in which sequence? A) food → citric acid cycle → ATP → NAD+ B) food → NADH → electron transport chain → oxygen C) glucose → pyruvate → ATP → oxygen D) glucose → ATP → electron transport chain → NADH E) food → glycolysis → citric acid cycle → NADH → ATP 93) The primary role of oxygen in cellular respiration is to A) yield energy in the form of ATP as it is passed down the respiratory chain. B) act as an acceptor for electrons and hydrogen, forming water. C) combine with carbon, forming CO2. D) combine with lactate, forming pyruvate. E) catalyze the reactions of glycolysis. 94) In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP + Pi to ATP? A) energy released as electrons flow through the electron transport system B) energy released from substrate-level phosphorylation C) energy released from ATP synthase pumping hydrogen ions from the mitochondrial matrix D) energy released from movement of hydrogen ions through ATP synthase E) No external source of energy is required because the reaction is exergonic. 95 Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle? A) CO2 and glucose B) H2O and O2 C) ADP, Pi, and NADP+ D) electrons and H+ E) ATP and NADPH 96) Which of the following statements best represents the relationships between the light 18 Practice AP Multiple Choice Exam 1 Do NOT write on this! reactions and the Calvin cycle? A) The light reactions provide ATP and NADPH to the Calvin cycle, and the cycle returns ADP, Pi, and NADP+ to the light reactions. B) The light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle, and the cycle provides water and electrons to the light reactions. C) The light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies the light reactions with sugars to produce ATP. D) The light reactions provide the Calvin cycle with oxygen for electron flow, and the Calvin cycle provides the light reactions with water to split. E) There is no relationship between the light reactions and the Calvin cycle. 97) Where do the enzymatic reactions of the Calvin cycle take place? A) stroma of the chloroplast B) thylakoid membranes C) outer membrane of the chloroplast D) electron transport chain E) thylakoid space 98) What is the primary function of the Calvin cycle? A) use ATP to release carbon dioxide B) use NADPH to release carbon dioxide C) split water and release oxygen D) transport RuBP out of the chloroplast E) synthesize simple sugars from carbon dioxide 99) Which of the following sequences correctly represents the flow of electrons during photosynthesis? A) NADPH → O2 → CO2 B) H2O → NADPH → Calvin cycle C) NADPH → chlorophyll → Calvin cycle D) H2O → photosystem I → photosystem II E) NADPH → electron transport chain → O2 100) The most abundant enzyme on earth is A) ATP Synthase B) Rubisco C) Amylase D) DNA Polymerase E) Catalase 19