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Exam 2
life 102 CSU
74
Biology
Undergraduate 1
03/02/2009

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Term
1. Organisms that obtain energy by metabolizing molecules produced by other organisms are:
Definition
Heterotrophs
Term
2. Which of the following are products of light reaction of photosynthesis that are used in the Calvin Cyle?
Definition
ATP+NADPH
Term
3. During photosynthesis, visible light has enough energy to:
Definition
Excite electrons
Term
4. What is the main role of antenna pigment molecules in thylakoid membranes?
Definition
1. Split H2O and release O2
2. Harvest photons and transfer light energy to reaction center
Term
5. Cyclic photophosphorylation to produce ATP is carried out by:
Definition
Photosystem I
Term
6. Chlorophyll and other pigments involved in photosynthesis are located
Definition
Thylakoids
Term
7. glycolysis occurs in:
Definition
cytoplasm
Term
8. photorespiration:
Definition
involves the same enzyme, ribulose-bisphosphate carboxylase (Rubisco) of calvin cycle
Term
9. CAM plant fix CO2 from organic acids during:
Definition
Day time through Calvin cycle
Term
10. Oxygen released during photosynthesis comes from the splitting of:
Definition
H2O
Term
11. cells produce most ATP by:
Definition
aerobic respiration
Term
12. a noncompetitive enzyme inhibitor:
Definition
binds to a site other than active site of enzyme
Term
13. Under aerobic conditions, yeast does not produce:
Definition
Ethanol or ethyl alcohol
Term
14. Glyceraldehyde-3-phosphate (G3P) is produced in calvin cycle during
Definition
. Phase II (reduction phase)
Term
15. Substances that tend to maintain pH
Definition
Buffers
Term
16. A photosystem contains:
Definition
Light harvesting antenna and reaction center
Term
17. All life forms on earth derive energy from:
Definition
Sunlight
Term
18. Photophosphorylation involves generation of:
Definition
ATP of solar energy
Term
19. which of the following processes is driven by electron transport chain from light driven reactions?
Definition
Creation of pH gradient by pumping protons across the thylakoid membranes
Term
20. Net gain of ATP from glycolysis consists of:
Definition
Two ATP
Term
21. Krebs cycle recycles:
Definition
Ocaloacetate
Term
22. Energized (excited) electrons from the photosystem are captured by:
Definition
Primary electron acceptor
Term
23. Chemiosmosis causes:
Definition
Generation of ATP from ADP
Term
24. In cellular respiration most ATP is generated by:
Definition
Oxidative phosphorylation
Term
Metabolic reactions
Definition
sum total of all biological reaction
Term
exergonic reaction
Definition
reaction that release heat/energy
Term
Anabolic reactions
Definition
reactions in the biosynthesis of biochemicals
Term
endergonic reaction
Definition
reaction that consumes energy/heat
Term
catabolic reactions
Definition
reactions involved in break down of organic compounds
Term
34. Fermentation in yeast results in:
Definition
Production of alcohol
Term
35. Allosteric enzyme oscillates between inactive and active state because:
Definition
Of conformation change at a site other than the active site
Term
36. Properties associated with an enzyme:
Definition
a. Has an active site
b. Substrate specific
c. Binds to substrate
d. Lowers activation energy
e. All of the above
Term
37. Immediat energy source in the cell that drives reactions is:
Definition
ATP
Term
38. Fatty acids are oxidized by
Definition
Beta oxidation
Term
39. noncyclic electron flow in photosynthesis results in the synthesis of
Definition
ATP and NADPH
Term
40. Which of the following proteins is most abundant in the biosphere:
Definition
Ribulose bisphosphate carboxylase (Rubisco)
Term
41. In oxidative phosphorylation electrons are ultimately accepted by:
Definition
Oxygen
Term
42. CO2 in mesophyll cells of C4 plants condenses with:
Definition
Phosphoenol pyruvate (PEP) to make four carbon product
Term
43. Calvin cycle recycles:
Definition
Ribulose bisphosphate
Term
44. energy released from electron transport chain is used to pump H+ ions into which location:
Definition
mitochondrion intermembrane space
Term
45. in chemiosmosis what is the direct source of energy that converts ADP + Pi into ATP?
Definition
energy from movement of proton through ATP synthesis
Term
46. During aerobic respiration, electrons travel down hill in which sequence:
Definition
Glucose → NADH → electron transport → O2
Term
47. What is a nonprotein “helper” of enzyme molecule called?
Definition
Coenzyme/cofactor
Term
48. Which of these statements about an enzyme is true?
Definition
Enzymes increase the rate of a reaction
Term
49. Which term describes the cellular process of breakdown of large molecules into smaller ones?
Definition
Catabolism
Term
50. Cellular process in which glucose is degraded into carbon dioxide and H2O is called:
Definition
Cellular respiration
Term
1. An enzyme accelerates a metabolic reaction by
Definition
Lowering the activation energy.
Term
2. You can increase the (faster) yield of a product in enzymatic reaction at substrate saturation by
Definition
adding more enzyme
Term
3. An allosteric enzyme shuttles between active and inactive state because
Definition
inhibitor binds to an alternative site and changes conformation
Term
4. Exergonic reaction occurs spontaneously because
Definition
They have free energy
Term
5. Noncompetitive enzyme inhibitor
Definition
binds to the site other than the active site of the enzyme
Term
6. Calvin cycle fixes
Definition
CO2
Term
7. Photosystem consists of
Definition
a. a light harvesting system
b. reaction center chlorophyll
c. primary electron acceptor
ALL
Term
8. In photosynthesis which sequence represents correct flow of electrons
a. H2O ® photosystem I ® photosystem II
b. NADPH ® electron transport chain ® O2
c. NADH ® O2 ® CO2
d. H2O to NADPH ® Calvin cycle
Definition
D. H2O-> NADPH -> Calvin cyle
Term
9. Cyclic electron flow consists of
Definition
photosystem 1 that channels electrons from Fd to cytochrome complex
Term
Oxidation of reaction center P 680 causes:
Definition
electron to be stripped from H2O
Term
11. C3 Plants
Definition
light reaction and Calvin cycle takes place at the same
time
Term
12. C4 Plants
Definition
light reactions and Calvin cycle spatially separated
Term
13. CAM Plant
Definition
temporal separation of a light reactions and calvin cycle
Term
Chemoautotroph
Definition
get energy by: oxidation inorganic substances and light
Term
Heterotroph
Definition
gets organic material for their nutrition
Term
16. Fermentation is a process by which
Definition
c. ethanol is produced by yeast
Term
Facultative anaerobes:
Definition
can produce ATP with or without oxygen
Term
18. Metabolic pathway that is common to fermentation and cellular respiration
Definition
glycolysis
Term
19. Final electron acceptor in oxidative phosphorylation involving electron transport chain is
Definition
Oxygen
Term
20. Source of energy on all life on earth is
Definition
Sunlight
Term
21. pH of solution will change when H ions are added
Definition
will become acidic
Term
Glycolysis occurs in:
Definition
cell cytoplasm
Term
23. Photosynthetic pigment is located in
Definition
thykaloids
Term
24. Chemiosmosis is important for
Definition
provides proton motive force
Term
25. More ATP is generated by
Definition
oxidative phosphorylation
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