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CIBI 3031-062
Midterm Examination II
17 October 2005
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
____
1. Metabolism describes
a. reactions that break apart nutrients to release energy.
b. the cell’s capacity to aquire energy.
c. both of these
____ 2. Glycolysis depends upon a continuous supply of glucose and
a. NAD+ .
b. water.
c. pyruvate.
____
3. Plants directly need which of the following to carry on photosynthesis?
a. C6H12O6.
b. H2O and CO2.
c. O2.
____
4. The conversion of solar energy to chemical energy occurs during
a. photosynthesis.
b. respiration.
c. glycolysis.
____
5. ATP is
a. produced by transferring a phosphate group from ADP to another compound.
b. the energy currency of a cell.
c. produced during the phosphorylation of any organic compound.
____
6. Hydrogen ion flow in the thylakoid compartments of chloroplasts
a. provides energy to produce ATP.
b. occurs within photosystems I and II.
c. causes excitation of chlorophyll molecules.
____
7. The carbon source for organisms that derive their energy from photosynthesis is
a. carbon monoxide.
b. carbon dioxide.
c. hydrocarbons.
____
8. Essentially, the first law of thermodynamics says that
a. one form of energy cannot be converted into another.
b. energy can be neither created nor destroyed.
c. entropy is decreasing in the universe.
____
9. NAD+ and FAD are
a. coenzymes.
b. proteins.
c. simple sugars.
____ 10. 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.
1
(2 points each)
____ 11. Photosystems are mainly
a. light-trapping molecules.
b. clusters of ATP molecules.
c. sugar assembly sites.
____ 12. Which of the following statements about the electromagnetic spectrum is true?
a. Visible light has more energy than ultraviolet radiation.
b. Chlorophyll absorbs some visible wavelengths, but not all.
c. Chlorophyll absorbs all wavelengths of light equally.
____ 13. The products of the light-dependent reactions of photosynthesis
a. are water and glucose.
b. are used in the light-independent reactions.
c. are complex carbohydrates and proteins.
____ 14. Chlorophyll reflects (does not absorb) which color of light?
a. violet
b. green
c. red
____ 15. 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.
____ 16. 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.
____ 17. The light-dependent reactions of photosynthesis
a. use carbon dioxide to produce food that cells can use.
b. involve photolysis of water.
c. produce pyruvate, which is used in the light-independent reactions.
____ 18. In plants, photosynthesis occurs in
a. chloroplasts.
b. vacuoles.
c. mitochondria.
____ 19. In aerobic respiration, __________ is used as the final electron acceptor.
a. hydrogen
b. carbon
c. oxygen
____ 20. The assembly of sugars during photosynthesis
a. is performed by chlorophyll.
b. occurs during light-independent reactions.
c. occurs during light-dependent reactions.
____ 21. Substances that enter a reaction are called
a. intermediates.
b. products.
c. reactants.
2
____ 22. The oxygen released in photosynthesis comes from
a. water.
b. glucose.
c. carbon dioxide.
____ 23. During the Krebs cycle,
a. oxaloacetate is regenerated.
b. electrons and H+ are transferred to coenzymes NAD+ and FAD.
c. both of these
____ 24. All living organisms
a. are photoautotrophic.
b. have a true nucleus.
c. generate ATP and produce carbon dioxide.
____ 25. The transition of the early earth's atmosphere from one rich in hydrogen to one rich in oxygen may be
attributed to
a. photophosphorylation.
b. photolysis.
c. chlorophyll degradation.
____ 26. The chemical that enters the mitochondria to continue respiration is
a. oxaloacetate.
b. phosphoglyceraldehyde (PGAL).
c. pyruvate.
____ 27. The electron transfer chain of aerobic respiration is located
a. on the inner membrane of the chloroplasts.
b. on the inner membrane of the mitochondria.
c. on the outer membrane of the mitochondria.
____ 28. The Krebs cycle takes place in the
a. mitochondria.
b. chloroplasts.
c. cytoplasm.
____ 29. When light excites chlorophyll, the chlorophyll molecule
a. becomes radioactive.
b. absorbs the energy and moves an electron to a higher energy state.
c. changes to carotene.
____ 30. The greatest number of ATP molecules is produced in
a. glycolysis.
b. the Krebs cycle.
c. electron transfer phosphorylation.
____ 31. The breakdown of pyruvate in the Krebs cycle results in the release of
a. carbon dioxide.
b. oxygen.
c. both of these.
3
____ 32. 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.
____ 33. Most carbon enters the web of life through
a. photosynthesis.
b. anaerobic respiration.
c. aerobic respiration.
____ 34. The most abundant acceptor for hydrogen released in the Krebs cycle is
a. NAD+ .
b. FAD.
c. FADH2.
____ 35. When molecules are broken apart in aerobic respiration,
a. the released energy is transferred to molecules of ATP.
b. the oxygen in the compounds that are broken apart is used as an energy source.
c. the heat produced is used to drive biological reactions.
____ 36. Heterotrophs obtain their energy and carbon from
a. the sun and atmosphere directly.
b. chemical compounds formed by autotrophs.
c. inorganic sources.
____ 37. The original source for the energy stored in food is
a. the sun.
b. various metabolic pathways found in all living organisms.
c. certain green plants.
____ 38. For glycolysis to begin,
a. there must be an input of energy from ATP.
b. glucose must enter the mitochondria.
c. oxygen must be available.
____ 39. Enzymes
a. make reactions occur that could not otherwise occur.
b. are usually not specific with respect to the reactants that they recognize and bind.
c. increase reaction rates.
____ 40. How many ATP molecules (net yield) are produced per molecule of glucose degraded during
glycolysis?
a. 9
b. 2
c. 36
4
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 3031-062
Answer Section
Midterm Examination II
17 October 2005
MULTIPLE CHOICE
1. ANS:
TOP:
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31. ANS:
32. ANS:
TOP:
33. ANS:
C
DIF: Difficult
ENERGY AND THE UNDERLYING ORGANIZATION OF LIFE
A
DIF: Moderate
GLYCOLYSIS: FIRST STAGE OF ENERGY-RELEASING PATHWAYS
B
DIF: Easy
A
DIF: Easy
B
DIF: Easy
TOP: HOW DO CELLS MAKE ATP?
A
DIF: Difficult
CASE STUDY: A CONTROLLED RELEASE OF ENERGY
B
DIF: Easy
TOP: PHOTOSYNTHESIS-AN OVERVIEW
B
DIF: Easy
ENERGY AND THE UNDERLYING ORGANIZATION OF LIFE
A
DIF: Difficult
ELECTRON TRANSFER CHAINS IN THE MAIN METABOLIC PATHWAYS
C
DIF: Difficult
TOP: THE LIGHT-DEPENDENT REACTIONS
A
DIF: Moderate
TOP: THE RAINBOW CATCHERS
B
DIF: Difficult
TOP: SUNLIGHT AS AN ENERGY SOURCE
B
DIF: Difficult
TOP: THE LIGHT-DEPENDENT REACTIONS
B
DIF: Moderate
TOP: THE RAINBOW CATCHERS
B
DIF: Moderate
ENERGY AND THE UNDERLYING ORGANIZATION OF LIFE
B
DIF: Moderate
GLYCOLYSIS: FIRST STAGE OF ENERGY-RELEASING PATHWAYS
B
DIF: Moderate
TOP: THE LIGHT-DEPENDENT REACTIONS
A
DIF: Moderate
TOP: PHOTOSYNTHESIS-AN OVERVIEW
C
DIF: Moderate
TOP: HOW DO CELLS MAKE ATP?
B
DIF: Difficult
TOP: PHOTOSYNTHESIS-AN OVERVIEW
C
DIF: Easy
CELLS JUGGLE SUBSTANCES AS WELL AS ENERGY
TOP: PHOTOSYNTHESIS-AN OVERVIEW
A
DIF: Moderate
C
DIF: Difficult
TOP: SECOND STAGE OF THE AEROBIC PATHWAY
C
DIF: Moderate
B
DIF: Difficult
TOP: THE LIGHT-DEPENDENT REACTIONS
C
DIF: Difficult
TOP: SECOND STAGE OF THE AEROBIC PATHWAY
B
DIF: Difficult
TOP: THIRD STAGE OF THE AEROBIC PATHWAY
A
DIF: Easy
TOP: SECOND STAGE OF THE AEROBIC PATHWAY
B
DIF: Moderate
TOP: THE RAINBOW CATCHERS
C
DIF: Moderate
TOP: THIRD STAGE OF THE AEROBIC PATHWAY
A
DIF: Easy
TOP: SECOND STAGE OF THE AEROBIC PATHWAY
C
DIF: Moderate
GLYCOLYSIS: FIRST STAGE OF ENERGY-RELEASING PATHWAYS
A
DIF: Moderate
TOP: PHOTOSYNTHESIS-AN OVERVIEW
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ID: A
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38.
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TOP:
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40. ANS:
TOP:
A
DIF: Difficult
TOP: THIRD STAGE OF THE AEROBIC PATHWAY
A
DIF: Moderate
B
DIF: Difficult
A
DIF: Easy
A
DIF: Difficult
GLYCOLYSIS: FIRST STAGE OF ENERGY-RELEASING PATHWAYS
C
DIF: Easy
TOP: ENZYMES HELP WITH ENERGY HILLS
B
DIF: Moderate
GLYCOLYSIS: FIRST STAGE OF ENERGY-RELEASING PATHWAYS
2