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CIBI 3031-070
Midterm Examination II
17 October 2005
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
____ 1. Glycolysis
a. results in the production of glucose and occurs in the chloroplast.
b. results in the production of pyruvate and occurs in the cytoplasm.
c. results in the production of pyruvate and occurs in the mitochondria.
____
2. The carbon source for organisms that derive their energy from photosynthesis is
a. hydrocarbons.
b. carbon monoxide.
c. carbon dioxide.
____ 3. The original source for the energy stored in food is
a. various metabolic pathways found in all living organisms.
b. certain green plants.
c. the sun.
____
4. The Krebs cycle takes place in the
a. mitochondria.
b. cytoplasm.
c. chloroplasts.
____ 5. In plants, photosynthesis occurs in
a. vacuoles.
b. chloroplasts.
c. mitochondria.
____
6. The greatest number of ATP molecules is produced in
a. the Krebs cycle.
b. electron transfer phosphorylation.
c. glycolysis.
____ 7. The assembly of sugars during photosynthesis
a. occurs during light-independent reactions.
b. occurs during light-dependent reactions.
c. is performed by chlorophyll.
____
8. Which of the following statements about the electromagnetic spectrum is true?
a. Chlorophyll absorbs all wavelengths of light equally.
b. Chlorophyll absorbs some visible wavelengths, but not all.
c. Visible light has more energy than ultraviolet radiation.
____
9. ATP is
a. the energy currency of a cell.
b. produced during the phosphorylation of any organic compound.
c. produced by transferring a phosphate group from ADP to another compound.
____ 10. All living organisms
a. generate ATP and produce carbon dioxide.
b. are photoautotrophic.
c. have a true nucleus.
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(2 points each)
____ 11. Metabolism describes
a. reactions that break apart nutrients to release energy.
b. the cell’s capacity to aquire energy.
c. both of these
____ 12. Hydrogen ion flow in the thylakoid compartments of chloroplasts
a. causes excitation of chlorophyll molecules.
b. provides energy to produce ATP.
c. occurs within photosystems I and II.
____ 13. Heterotrophs obtain their energy and carbon from
a. the sun and atmosphere directly.
b. inorganic sources.
c. chemical compounds formed by autotrophs.
____ 14. In aerobic respiration, __________ is used as the final electron acceptor.
a. hydrogen
b. oxygen
c. carbon
____ 15. Substances that enter a reaction are called
a. reactants.
b. intermediates.
c. products.
____ 16. During the Krebs cycle,
a. oxaloacetate is regenerated.
b. electrons and H+ are transferred to coenzymes NAD+ and FAD.
c. both of these
____ 17. Essentially, the first law of thermodynamics says that
a. one form of energy cannot be converted into another.
b. entropy is decreasing in the universe.
c. energy can be neither created nor destroyed.
____ 18. Most carbon enters the web of life through
a. anaerobic respiration.
b. photosynthesis.
c. aerobic respiration.
____ 19. The light-dependent reactions of photosynthesis
a. produce pyruvate, which is used in the light-independent reactions.
b. use carbon dioxide to produce food that cells can use.
c. involve photolysis of water.
____ 20. For glycolysis to begin,
a. oxygen must be available.
b. there must be an input of energy from ATP.
c. glucose must enter the mitochondria.
____ 21. The oxygen released in photosynthesis comes from
a. glucose.
b. carbon dioxide.
c. water.
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____ 22. When molecules are broken apart in aerobic respiration,
a. the released energy is transferred to molecules of ATP.
b. the heat produced is used to drive biological reactions.
c. the oxygen in the compounds that are broken apart is used as an energy source.
____ 23. The conversion of solar energy to chemical energy occurs during
a. glycolysis.
b. respiration.
c. photosynthesis.
____ 24. Which of the following best describes an electron transfer chain?
a. It requires activation by sunlight.
b. It uses ATP in the synthesis of sugars.
c. It transfers energy, stepwise, from one compound to another.
____ 25. The products of the light-dependent reactions of photosynthesis
a. are water and glucose.
b. are complex carbohydrates and proteins.
c. are used in the light-independent reactions.
____ 26. When light excites chlorophyll, the chlorophyll molecule
a. absorbs the energy and moves an electron to a higher energy state.
b. becomes radioactive.
c. changes to carotene.
____ 27. Plants directly need which of the following to carry on photosynthesis?
a. H2O and CO2.
b. O2.
c. C6H12O6.
____ 28. The electron transfer chain of aerobic respiration is located
a. on the inner membrane of the chloroplasts.
b. on the outer membrane of the mitochondria.
c. on the inner membrane of the mitochondria.
____ 29. How many ATP molecules (net yield) are produced per molecule of glucose degraded during
glycolysis?
a. 2
b. 36
c. 9
____ 30. NAD+ and FAD are
a. coenzymes.
b. simple sugars.
c. proteins.
____ 31. Chlorophyll reflects (does not absorb) which color of light?
a. red
b. green
c. violet
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____ 32. Which of the following is NOT true?
a. Cells lose some energy in the form of heat.
b. The most important form of energy available for living organisms is heat.
c. The primary source for energy on earth is the sun.
____ 33. The transition of the early earth's atmosphere from one rich in hydrogen to one rich in oxygen may be
attributed to
a. chlorophyll degradation.
b. photolysis.
c. photophosphorylation.
____ 34. Photosystems are mainly
a. clusters of ATP molecules.
b. light-trapping molecules.
c. sugar assembly sites.
____ 35. The process by which a small amount of the energy in a glucose molecule is released, as it is converted
into two small organic acid molecules, is called
a. photolysis.
b. oxidative phosphorylation.
c. glycolysis.
____ 36. Enzymes
a. make reactions occur that could not otherwise occur.
b. increase reaction rates.
c. are usually not specific with respect to the reactants that they recognize and bind.
____ 37. Glycolysis depends upon a continuous supply of glucose and
a. NAD+ .
b. pyruvate.
c. water.
____ 38. The most abundant acceptor for hydrogen released in the Krebs cycle is
a. FAD.
b. FADH2.
c. NAD+ .
____ 39. The chemical that enters the mitochondria to continue respiration is
a. pyruvate.
b. phosphoglyceraldehyde (PGAL).
c. oxaloacetate.
____ 40. The breakdown of pyruvate in the Krebs cycle results in the release of
a. carbon dioxide.
b. oxygen.
c. both of these.
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41 – 45. Write the reactants and products of the general photosynthesis equation in the
appropriate blanks in the following diagram. Use each reactant and product only ONCE. You
do not need to indicate the amount of each molecule involved.
(2 points each)
46 – 50. Write the reactants and products of the general aerobic respiration equation in the
appropriate blanks in the following diagram. You need to use one of the products TWICE but
use each of the remaining products and reactants only ONCE. You do not need to indicate the
amount of each molecule involved.
(2 points each)
ID: A
CIBI 3031-070
Answer Section
Midterm Examination II
17 October 2005
MULTIPLE CHOICE
1. ANS:
TOP:
2. ANS:
3. ANS:
4. ANS:
5. ANS:
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11. ANS:
TOP:
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15. ANS:
TOP:
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17. ANS:
TOP:
18. ANS:
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20. ANS:
TOP:
21. ANS:
22. ANS:
23. ANS:
24. ANS:
25. ANS:
26. ANS:
27. ANS:
28. ANS:
29. ANS:
TOP:
30. ANS:
TOP:
31. ANS:
32. ANS:
TOP:
33. ANS:
B
DIF: Moderate
GLYCOLYSIS: FIRST STAGE OF ENERGY-RELEASING PATHWAYS
C
DIF: Easy
TOP: PHOTOSYNTHESIS-AN OVERVIEW
C
DIF: Easy
A
DIF: Easy
TOP: SECOND STAGE OF THE AEROBIC PATHWAY
B
DIF: Moderate
TOP: PHOTOSYNTHESIS-AN OVERVIEW
B
DIF: Moderate
TOP: THIRD STAGE OF THE AEROBIC PATHWAY
A
DIF: Difficult
TOP: PHOTOSYNTHESIS-AN OVERVIEW
B
DIF: Difficult
TOP: SUNLIGHT AS AN ENERGY SOURCE
A
DIF: Easy
TOP: HOW DO CELLS MAKE ATP?
A
DIF: Moderate
C
DIF: Difficult
ENERGY AND THE UNDERLYING ORGANIZATION OF LIFE
B
DIF: Difficult
CASE STUDY: A CONTROLLED RELEASE OF ENERGY
C
DIF: Difficult
B
DIF: Moderate
TOP: HOW DO CELLS MAKE ATP?
A
DIF: Easy
CELLS JUGGLE SUBSTANCES AS WELL AS ENERGY
C
DIF: Difficult
TOP: SECOND STAGE OF THE AEROBIC PATHWAY
C
DIF: Easy
ENERGY AND THE UNDERLYING ORGANIZATION OF LIFE
B
DIF: Moderate
TOP: PHOTOSYNTHESIS-AN OVERVIEW
C
DIF: Moderate
TOP: THE LIGHT-DEPENDENT REACTIONS
B
DIF: Difficult
GLYCOLYSIS: FIRST STAGE OF ENERGY-RELEASING PATHWAYS
C
DIF: Moderate
TOP: PHOTOSYNTHESIS-AN OVERVIEW
A
DIF: Moderate
C
DIF: Easy
C
DIF: Difficult
TOP: THE LIGHT-DEPENDENT REACTIONS
C
DIF: Difficult
TOP: THE LIGHT-DEPENDENT REACTIONS
A
DIF: Moderate
TOP: THE RAINBOW CATCHERS
A
DIF: Easy
C
DIF: Difficult
TOP: THIRD STAGE OF THE AEROBIC PATHWAY
A
DIF: Moderate
GLYCOLYSIS: FIRST STAGE OF ENERGY-RELEASING PATHWAYS
A
DIF: Difficult
ELECTRON TRANSFER CHAINS IN THE MAIN METABOLIC PATHWAYS
B
DIF: Moderate
TOP: THE RAINBOW CATCHERS
B
DIF: Moderate
ENERGY AND THE UNDERLYING ORGANIZATION OF LIFE
B
DIF: Difficult
TOP: THE LIGHT-DEPENDENT REACTIONS
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ID: A
34. ANS: B
DIF: Moderate
TOP: THE RAINBOW CATCHERS
35. ANS: C
DIF: Moderate
TOP: GLYCOLYSIS: FIRST STAGE OF ENERGY-RELEASING PATHWAYS
36. ANS: B
DIF: Easy
TOP: ENZYMES HELP WITH ENERGY HILLS
37. ANS: A
DIF: Moderate
TOP: GLYCOLYSIS: FIRST STAGE OF ENERGY-RELEASING PATHWAYS
38. ANS: C
DIF: Difficult
TOP: THIRD STAGE OF THE AEROBIC PATHWAY
39. ANS: A
DIF: Difficult
TOP: SECOND STAGE OF THE AEROBIC PATHWAY
40. ANS: A
DIF: Easy
TOP: SECOND STAGE OF THE AEROBIC PATHWAY
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