BIOS E-1a exam 01 101211 question page


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Unformatted text preview: PLEASE DO NOT OPEN THIS PACKET UNTIL ALL STUDENTS HAVE A COPY AND YOUR TFs TELL YOU TO BEGIN Multiple Choice (2 pts each) 1. Hydrogen bonds are: A) specific to water molecules. B) ionic interactions. C) covalent bonds. D) weak non ­covalent interactions. 2. A peptide bond is formed by which of the following types of reactions: A) condensation B) reduction ­oxidation C) isomerization D) functional group transfer 3. Which of the following forces stabilize protein structure? A) electrostatic interactions B) hydrogen bonding C) hydrophobic interactions D) covalent crosslinks 4. Which of the following describes a difference between membrane carrier proteins and membrane channel proteins? A) Carrier proteins transport molecules down their concentration gradient while channel proteins move molecules against their concentration gradient. B) Carrier proteins do not interact in a specific manner with the material they transport while channel proteins do exhibit stereospecifity. C) Carrier proteins transport material at a slower rate than channel proteins. D) Carrier proteins do not undergo active transport while channels do mediate active transport. 5. Compared to olive oil, beef fat is has a higher proportion of A) long ­chain unsaturated fatty acids. B) long ­chain saturated fatty acids. C) short ­chain unsaturated fatty acids. D) short ­chain saturated fatty acids. 6. Which of the following statement(s) about the nuclear envelope is (are) true? A) It contains pores for the passage of large molecules. B) It is composed of two membranes. C) It contains ribosomes on the inner surface. D) It lacks transmembrane proteins. 7. Two characteristics of water make it different from most other compounds: Its solid state is _______ its liquid state and it takes up _______ heat to change to its gaseous state. A) less dense than; large amounts of B) more dense than; small amounts of C) less dense than; small amounts of D) more dense than; large amounts of 8. The rough ER is the portion of the ER that A) lacks ribosomes. B) is the site of lipid production. C) has ribosomes attached to it. D) is connected to the Golgi apparatus. 9. If the free energy change ΔG for a reaction is  ­46.11 kcal/mol, the reaction is: A) at equilibrium. B) endergonic. C) exergonic. D) exothermic. 10. Ribose and deoxyribose are both found in nucleic acids. The difference between ribose and deoxyribose is that: A) deoxyribose has one less oxygen molecule than ribose. B) ribose is a pentose sugar, whereas deoxyribose is a hexose sugar. C) deoxyribose is found in DNA, whereas ribose is found in RNA. D) deoxyribose is phosphorylated, whereas ribose is not. 11. Which of the following protein structures is destroyed by denaturation? A) Primary B) Secondary C) Tertiary D) Quaternary 12. Which of the following does not represent a correct monomer/polymer pairing? A) Monosaccharide/polysaccharide B) Amino acid/protein C) Triglyceride/cellulose D) Nucleotide/nucleic acid 13. Because of the properties of chlorophyll, plants need adequate _______ light to grow properly. A) green B) blue and red C) infrared D) ultraviolet 14. The main control mechanism in glycolysis is the A) negative feedback of citrate accumulation. B) presence or absence of oxygen. C) enzyme phosphofructokinase and ATP levels. D) supply of NAD. 15. The macromolecules that serve in the storage and transmission of genetic information are: A) carbohydrates. B) lipids. C) nucleic acids. D) proteins. 16. Which contains more molecules, a mole of hydrogen or a mole of carbon? A) A mole of carbon. B) A mole of hydrogen. C) Both contain the same number of molecules. D) Inadequate information is provided. 17. A covalent bond is the sharing of _______ between atoms, whereas an ionic bond is the _______. A) electrons; electric attraction between two atoms B) protons; electric attraction between two atoms C) protons; sharing of electrons D) electrons; transfer of electrons from one atom to another 18. In the conversion of succinate to fumarate, hydrogen atoms are transferred to FAD. The conversion of succinate and FAD to fumarate and FADH2 is an example of A) hydrolysis. B) an allosteric reaction. C) a condensation reaction. D) a reduction ­oxidation (redox) reaction. 19. The drug 2,4 ­dinitrophenol (DNP) destroys the proton gradient across the inner mitochondrial membrane. What would be the effect of incubating isolated mitochondria in a solution of DNP? A) Oxygen would no longer be reduced to water. B) No ATP would be made during transport of electrons down the respiratory chain. C) Mitochondria would show a burst of increased ATP synthesis. D) Glycolysis would stop. 20. A graph that plots the rate at which CO2 is converted to glucose versus the wavelength of light illuminating a leaf is called A) an absorption spectrum. B) an adsorption spectrum. C) an electromagnetic spectrum. D) an action spectrum. MATCHING (1 pt each) Choose the answer from the word bank below that best matches the provided description. 21. Harnesses the energy stored in NADH for the generation of a proton gradient 22. The oxidation of pyruvate to carbon dioxide 23. Occurs in the cytosol and results in the breakdown of glucose to pyruvate 24. Enzyme that couples the generation of ATP with proton diffusion 25. Negatively charged ion 26. Carbohydrate storage in plants 27. Carbohydrate storage in animals 28. Structural component of cell walls 29. Number of these determines one element from another 30. Molecules that release hydrogen ions in aqueous solution Word Bank: Proton Neutron Electron Acid Base Cation Anion Starch Glycogen Cellulose Citric Acid Cycle Glycolysis Electron Transport Chain ATP synthase Fermentation TRUE or FALSE (1 pt each) – Circle the words TRUE or FALSE on your answer sheet. Are the following statements regarding the relationship between photosynthesis and cellular respiration in plants true or false? 31. Photosynthesis occurs in specialized photosynthetic cells. 32. Cellular respiration occurs in specialized respiratory cells. 33. Cellular respiration and photosynthesis can occur in the same cell. 34. Cellular respiration does not occur in plant cells. Are the following statements concerning the Calvin cycle is true or false? 35. Light energy is not required for the cycle to proceed. 36. CO2 is assimilated into sugars. 37. RuBP is regenerated. 38. It uses energy stored in ATP and NADH. Are the following statements regarding glycolysis true or false? 39. A 6 ­C sugar is broken down to two 3 ­C molecules. 40. Two ATP molecules are consumed. 41. Glycolysis requires oxygen. 42. Glycolysis occurs in the cytosol. Are the following statements about enzyme catalysts true or false? 43. Their catalytic activity is independent of pH. 44. They can change the free energy of a reaction. 45. They can increase the reaction rate for a given reaction. 46. A single enzyme can catalyze multiple reactions because the enzyme itself is not a reactant or product. ...
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This note was uploaded on 02/09/2012 for the course BIOLOGY 102 taught by Professor Anderson during the Spring '11 term at Harvard.

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