Download Multiple Choice – Answers go on the Scantron

Biol 101
Exam 3: Energy, Photosynthesis & Respiration
Fall 2008
Multiple Choice – Answers go on the Scantron. Answer all 60 questions.
1. The first law of thermodynamics tells us that the quantity of energy is constantly increasing as the universe
continues to expand.
A. True
B. False
Figure 1: Chemical reaction
2. The reaction illustrated is
A. exergonic
B. endergonic
3. Reactants in the reaction would be expected to have more energy than
the products.
A. True
B. False
4. The reaction could in a general way represent the process of cellular
respiration with respect to energy found in reactants and products of
respiration.
A. True
B. False
Figure 2: Chemical Reaction
5. (Figure 2): Which substances are reactants?
A. A
B. B
C. A & B
D. A* & B*
6. (Figure 2): Which product is reduced?
A. A
B. B
C. A*
D. B*
7. The energy required to initiate a chemical reaction is called
A. catalysis.
B. initiation energy.
C. activation energy.
D. initial energy.
8) An enzyme can act as a catalyst because it will ___ the activation energy of a chemical reaction.
A. increase
B. decrease
C. not change
9) The term anaerobic means
A) without bacteria
B) without CO2
C) without ATP
D) without O2
10) How do cells capture the energy released by cellular respiration?
A) They store it in molecules of carbon dioxide.
B) They produce glucose.
C) The energy is coupled to oxygen.
D) They produce ATP.
11) Which one of the following is true?
A) Cellular respiration occurs in mitochondria and in chloroplasts.
B) Photosynthesis occurs in chloroplasts and cellular respiration occurs in mitochondria.
C) Photosynthesis occurs in mitochondria and in chloroplasts.
D) Photosynthesis occurs in mitochondria and cellular respiration occurs in chloroplasts.
E) Neither cellular respiration nor photosynthesis occurs in mitochondria and in chloroplasts.
12) Anaerobic cellular respiration in humans and aerobic cellular respiration ______.
A) can use glucose
B) produce ATP
C) are gas exchange processes
D) A & B
E) A, B & C
13) The overall reaction for anaerobic respiration of glucose by yeast would be:
B) C6H12O6 + O2 Æ CO2 + H2O + ATP + Heat
A) CO2 + H2O Æ C6H12O6 + O2 + ATP + Heat
D) C6H12O6 Æ CO2 + Ethyl alcohol + ATP + Heat
C) C6H12O6 Æ Lactic acid + ATP + Heat
14) Which of the following processes would produce the most ATP for a single molecule of C6H12O6?
A) CO2 + H2O Æ C6H12O6 + O2 + ATP + Heat
B) C6H12O6 + O2 Æ CO2 + H2O + ATP + Heat
D) C6H12O6 Æ CO2 + Ethyl alcohol + ATP + Heat
C) C6H12O6 Æ Lactic acid + ATP + Heat
15) During cellular respiration, the energy in glucose
A) is used to manufacture glucose.
B) is used to make ATP
C) becomes stored in molecules of ammonia.
D) makes carbon dioxide
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B101F08Exam3-03EnergyMetabolism
Biol 101
Exam 3: Energy, Photosynthesis & Respiration
Fall 2008
16) During oxidation-reduction reactions
A) a substance that gains electrons is said to be oxidized.
B) electrons are lost from one substance and added to another substance.
C) the loss of electrons from one substance is called reduction.
D) protons from one molecule replace the electrons lost from another molecule.
E) more than one answer is correct
+
17) During cellular respiration, NAD
A) is a coenzyme that is reduced to form NADH in the Krebs cycle.
B) is a coenzyme that is oxidized to form NADH in the electron transport chain.
C) delivers electrons directly to ATP.
D) A & C
E) B & C
18) Which of the following is a true statement about cellular aerobic respiration?
A) Molecular oxygen is eventually reduced by energy-depleted electrons to form water.
B) Electrons move through a series of electron-carrier molecules called the electron transport chain.
C) Electrons release large amounts of energy coupled to the movement of hydrogen ions across a membrane.
D) A & B
E) A, B & C
19) Which one of the following is the correct sequence of stages in aerobic cellular respiration?
A) glycolysis, oxidative phosphorylation, citric acid cycle, pyruvate grooming to Acetyl CoA
B) glycolysis, pyruvate grooming to Acetyl CoA, citric acid cycle, oxidative phosphorylation
C) pyruvate grooming to Acetyl CoA, citric acid cycle, oxidative phosphorylation, glycolysis
D) oxidative phosphorylation, citric acid cycle, glycolysis, pyruvate grooming to Acetyl CoA
E) oxidative phosphorylation, glycolysis, citric acid cycle, pyruvate grooming to Acetyl CoA
20) ATP can be synthesized in different ways in living organisms. What are they?
A) substrate-level phosphorylation
B) Chemiosmosis
C) nucleic acid synthesis
D) A & B
E) A, B & C
21) The expression “oxidative phosphorylation” refers to chemical reactions in the mitochondrion involving
A) electron transport chain
B) chemiosmosis
C) both A & B
D) neither A nor B
22) A drug is tested in the laboratory and is found to create holes in the inner mitochondrial membrane. Scientists
suspect that the drug will be harmful to human cells because it will directly inhibit
A) glycolysis.
B) chemiosmosis
C) protein transport
D) alcohol formation
E) photosynthesis
23) During which phase of cellular respiration does substrate-level phosphorylation take place?
A) the citric acid cycle
B) "grooming" of pyruvic acid
C) glycolysis
D) oxidative phosphorylation
E) glycolysis and the citric acid cycle
24) Which of the following metabolic pathways is found in both aerobic and anaerobic organisms?
A) oxidative phosphorylation
B) chemiosmosis
C) glycolysis
D) the citric acid cycle
E) more than one answer is correct
25) The end products of the citric acid cycle include all of the following except
A) CO2.
B) NADH.
C) glucose
D) FADH2.
E) ATP.
26) At the end of the citric acid cycle, most of the energy from Acetyl CoA is found in
B) reduced coenzymes NADH and FADH2
C) glucose
A) CO2
D) A & B
E) protons
27) When you breathe, carbon dioxide is exhaled. Where did most of it come from?
A) anaerobic respiration B) aerobic respiration
C) ATP
D) A & B
28) When you breathe with your lungs, oxygen is inhaled. Where is it used?
A) chemical grooming of pyruvate to form carbon dioxide
B) Krebs cycle to oxidize coenzymes
C) Electron transport chain as a final electron acceptor.
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B101F08Exam3-03EnergyMetabolism
Biol 101
Exam 3: Energy, Photosynthesis & Respiration
Fall 2008
29) Rotenone is a poison commonly added to insecticides. Insects exposed to rotenone will die because
A) they dehydrate
B) they can’t make enough ATP
C) they explode
D) A & B
E) A, B & C
30) Cyanide and dinitrophenol are metabolic poisons because they interfere with
A) glycolysis
B) chemical grooming of pyruvate
C) Krebs cycle
D) oxidative phosphorylation
31) Which process produces more ATP when a single glucose molecule is respired?
A) aerobic respiration.
B) anaerobic respiration
C) both about the same.
32) The process of cellular respiration is
A) exergonic
B) endergonic
C) balanced
33) Muscle soreness associated with strenuous exercise is due to
A) the presence of lactic acid produced during fermentation in muscle cells.
B) the large amount of carbon dioxide that builds up in the muscle.
C) the accumulation of alcohol from anaerobic respiration.
D) an excess of ATP that builds up during vigorous exercise.
34) The overall reaction for photosynthesis is
A) CO2 + H2O Æ C6H12O6 + O2 + ATP + Heat
B) C6H12O6 + O2 Æ CO2 + H2O + ATP + Light
C) CO2 + H2O + Light Æ C6H12O6 + O2
D) C6H12O6 + light Æ CO2 + Ethyl alcohol + ATP + Heat
Figure 3: Energy Metabolism
35) (Figure 3) The process or reaction at position B would
be:
A) photosynthesis
B) Cell Respiration
C. could be A or B
36) (Figure 3) The missing reactant at position A is
A) sunlight
B) Heat
C. ATP
37) Why are (most) plants green?
A) Chlorophylls reflect or transmit green light.
B) Chlorophylls use primarily green light as the source of energy for photosynthesis.
C) Green helps plants blend into their environment as a sort of camouflage.
D) All photosynthetic pigments are colored green.
E) More than one answer is correct.
Figure 4: Energy Metabolism
38) (Figure 4) The reactions in Figure 4 are typically those found
in
A) photosynthesis
B) cellular respiration
C. could be
A or B
39) (Figure 4) The chemical reactions illustrated in Figure 4 would
occur in
A) autotrophs
B) heterotrophs
C) could be A or B
40) The information given in Figure 4 indicates that
A) light harvesting must come before sugar-building
B) sugar- building relies on ATP and NADPH
C) Water and oxygen are used in the Light-dependent reactions
D) A & B
E) A, B & C
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B101F08Exam3-03EnergyMetabolism
Biol 101
Exam 3: Energy, Photosynthesis & Respiration
Fall 2008
41) Photoautotrophs like plants produce organic molecules from inorganic molecules.
A) True
B) False
42) Which of the following is an example of a photoautotroph?
A) algae
B) pine trees
C) cyanobacteria
D) A & B
E) A, B & C
43) Chloroplasts contain disk-like membranous sacs arranged in stacks called ___ used in the ___ reactions of ___.
A) cristae – Calvin cycle – photosynthesis
B) thylakoids – light harvesting - photosynthesis
C) vacuoles – light harvesting – respiration
D) stroma – Calvin cycle - photosynthesis
E) grana – light harvesting - photosynthesis
44) The oxygen released into the air as a product of photosynthesis comes from
A) the sun
B) chlorophyll.
C) carbon dioxide.
D) water.
E) None of the choices are correct.
45) In the chloroplast, sugars are made in a fluid-filled compartment called the
A) matrix.
B) mesophyll.
C) stomata.
D) thylakoid.
E) stroma.
46) Why do plants photosynthesize?
A) make ATP
B) make DNA
C) make sugars
D) make water
47) What is the source of energy that provides the boost for electrons during photosynthesis?
A) ATP B) light C) cellular respiration
D) electromagnetism
48) Carbon fixation during photosynthesis
A) occurs when carbon and oxygen from CO2 are incorporated into an organic molecule.
B) powers the process of glucose synthesis by supplying the cell with ATP.
C) occurs during the light reactions.
D) provides the cell with a supply of NADPH molecules.
E) more than one answer is correct
49) Sunlight is a type of __________ energy.
A) potential
B) kinetic
C) nuclear
D) electromagnetic
50) In a photosystem, clusters of chlorophyll a, chlorophyll b, and carotenoid pigments function most like
A) an electrical generator.
B) a propeller on a motorboat.
C) a windmill.
D) an antenna.
E) a spring.
51) Plants use photosystems during photosynthesis to absorb light energy to excite and transfer electrons to organic
molecules.
A) True
B) False
52) In photosynthesis, the chemiosmotic synthesis of ATP is like the production of ATP in mitochondria because both
use a hydrogen ion gradient to synthesize ATP.
A) True
B) False
53) Mitochondria transfer ___ energy from ___ to ATP; chloroplasts transform ___ energy into the chemical energy of
organic molecules.
A) food . . . light . . . chemical
B) food . . . light . . . nuclear
C) chemical . . . food . . . light
D) nuclear . . . light . . . food
E) light . . . food . . . kinetic
54) Plants use photosynthesis to obtain their carbon from
A) hydrocarbons.
B) glucose.
C) methane.
D) carbon dioxide.
55) In the process of photosynthesis, ATP and NADPH
A) play a role in sugar synthesis.
B) are energy sources for the photosystems.
C) are made on the inner mitochondrial membrane.
D) are products of the Calvin cycle.
E) All of the choices are correct.
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B101F08Exam3-03EnergyMetabolism
Biol 101
Exam 3: Energy, Photosynthesis & Respiration
Fall 2008
56) The process ultimately responsible for all the food we eat and the oxygen we breathe is
A) photosynthesis.
B) anaerobic metabolism.
C) chemiosmosis.
D) glycolysis.
E) cellular respiration.
57) Photophosphorylation differs from oxidative phosphorylation in that
A) the source of energy to drive photophosphorylation is sunlight.
B) the source of energy to drive oxidative phosphorylation come from organic (food) molecules.
C) Photophosphorylation uses chemiosmosis and oxidative phosphorylation does not.
D) A & B
E) A, B & C
58) In photophosphorylation, energy from electron flow is used to transport ______ from the ______to the thylakoid
compartment, generating a concentration gradient of __________.
A) H+. . . grana . . . electrons
B) electrons . . . stroma . . . H+
C) H+. . . stroma . . . ATP
D) H+. . . stroma . . . H+
E) electrons . . . grana . . . H+
59) Plant cells
A) lack mitochondria and chloroplasts.
C) have mitochondria but do not have chloroplasts.
B) have mitochondria and chloroplasts.
D) lack mitochondria but have chloroplasts.
60) If photosynthesis stopped on a global scale, what would happen?
A) heterotrophic aerobic organisms would eventually stop respiring aerobically due to lack of oxygen.
B) heterotrophic aerobic organisms would eventually die of starvation due to lack of food.
C) both A & B
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B101F08Exam3-03EnergyMetabolism