Download Biology 178 Practice Exam 3

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Bio 178 Section 001 (Spring 2006): Practice Questions for Third Exam
Take the Practice Exam under exam conditions. Time yourself! Also use your quizzes to prepare for this exam.
MULTIPLE CHOICE:
1.
The substrate fits in the ____________ of an enzyme:
(A) allosteric site
(B) active site
(C) reaction groove
(D) Golgi body
(E) inhibitor site
2.
Cofactors are:
(A) non-protein molecules that aid enzyme catalysis.
(B) protein molecules that aid enzyme catalysis.
(C) enzyme inhibitors.
(D) enzyme substrates.
(E) none of the above.
3.
When the rate of enzyme catalysis is plotted against temperature, the curve rises slowly at low temperatures because:
(A) the enzymes are denatured.
(B) this is the optimal temperature for enzyme catalysis.
(C) the enzyme is inhibited.
(D) the substrates do not move as fast at lower temperatures.
(E) none of the above.
4.
Enzymes speed up reaction rates because:
(A) they supply the activation energy.
(B) they provide heat.
(C) they lower the activation energy.
(D) they increase the activation energy.
(E) B and C.
5.
When NAD+ is reduced it:
(A) gains one electron and one hydrogen.
(B) loses one electron.
(C) gains 2 electrons and one hydrogen.
(D) gains 2 electrons only.
(E) gains 2 electons and 2 hydrogens.
6.
An anabolic reaction is:
(A) biosynthetic.
(B) a reaction involving feedback inhibition .
(C) hydrolytic.
(D) exergonic.
(E) C and D.
7.
Photosynthesis can be broken down into 2 principle stages, which are:
(A) the light reactions and Krebs cycle.
(B) glycolysis and the Calvin cycle.
(C) electron transport in the chloroplasts and in the mitochondria.
(D) the light reactions and the Calvin cycle.
(E) none of the above.
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8.
Plants are examples of:
(A) autotrophic organisms.
(B) heterotrophic organisms.
(C) photoautotrophic organisms.
(D) photosynthetic organisms.
(E) A, C, and D.
9.
Leaves of deciduous trees turn red, orange, and yellow in fall because:
(A) frost damages chlorophyll.
(B) chlorophyll is no longer manufactured.
(C) the carotenoid pigments are no longer masked.
(D) carotenoids are no longer manufactured.
(E) B and C.
10.
Even if catalysts are available, _________ must also be present for a reaction to occur.
(A) energy
(B) water
(C) cofactors
(D) heat
(E) All of the above.
11.
Which of the following are examples of electron carriers that are used in photosynthesis?
(A) NAD+.
(B) NADP+.
(C) FADH2.
(D) A and C.
(E) All of the above.
12.
Photosynthesis occurs in:
(A) leaves.
(B) roots.
(C) the cell wall.
(D) mitochondria and chloroplasts.
(E) A and D.
13.
Chlorophylls a and b mainly absorb:
(A) violet-blue and red light.
(B) green light.
(C) blue and green light.
(D) orange and yellow light.
(E) all of the above.
14.
In the light reactions of photosynthesis, high energy electrons are passed out of the photosystem by:
(A) the electron acceptor molecule.
(B) the electron donor molecule.
(C) carotenoids.
(D) specialized chlorophyll a molecules.
(E) B and D.
15.
In photosynthesis, ATP is made in the:
(A) matrix.
(B) thylakoid space.
(C) stroma.
(D) intermembrane space.
(E) cytoplam.
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16.
The energy for life is produced by:
(A) respiration.
(B) fermentation.
(C) photosynthesis.
(D) sex.
(E) none of the above.
17.
The waste products of respiration are used for:
(A) photosynthesis.
(B) respiration.
(C) deforestation.
(D) heredity.
(E) nucleotide synthesis.
18.
The H+ are pumped from _______ to _______ in the electron transport chain of photosynthesis:
(A) stroma to thylakoid space.
(B) thylakoid space to stroma.
(C) matrix to intermembrane space.
(D) intermembrane space to matrix.
(E) None of the above – H+ are not pumped, they move down their concentration gradient only.
19.
Grana is/are:
(A) enzymes that function in active transport.
(B) found in the chloroplasts.
(C) stacks of thylakoids.
(D) aging cells.
(E) B and C.
20.
The potential energy that an electron loses as it is passed down the electron transport chain to photosystem I is used to:
(A) pump protons into the stroma.
(B) pump protons into the thylakoid space.
(C) pump hydrogen ions from the stroma to the thylakoid space.
(D) synthesize ATP.
(E) B, C, and D.
21.
Which of the following is not true?
ATP synthase:
(A) functions in breaking down ATP into ADP and P i.
(B) allows H+ to diffuse back to the stroma.
(C) is found in the thylakoid membrane.
(D) is an enzyme.
(E) converts mechanical energy to chemical energy.
22.
Which of the following is not true? Blackmann was able to prove that photosynthesis is composed of both a light
dependent and a light independent stage by using 2 different conditions of:
(A) light intensity.
(B) oxygen.
(C) carbon dioxide.
(D) temperature.
(E) None of the above – they are ALL true.
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23.
The antenna complex is:
(A) a system of transmembrane proteins that function in electron transport.
(B) a protein that pumps hydrogen ions.
(C) a light gathering system of chlorophyll molecules and accessory pigments.
(D) a pair of chlorophyll a molecules that function as electron donors.
(E) An enzyme that reduces NADPH.
24.
If the current rate of deforestation continues we can expect the world’s tropical rainforests to be gone in approximately:
(A) one year.
(B) a decade.
(C) 30 years.
(D) a century.
(E) 1000 years.
25.
Deforestation is affecting climate by:
(A) increasing atmospheric CO2.
(B) decreasing evaporative cooling.
(C) decreasing cloud cover.
(D) decreasing rainfall.
(E) all of the above.
26.
The end product of glycolysis is:
(A) acetyl-co A.
(B) carbon dioxide and water.
(C) pyruvate.
(D) glucose.
(E) oxaloacetate.
27.
Krebs cycle occurs in the:
(A) cytoplasm.
(B) stroma.
(C) matrix.
(D) thylakoid membrane.
(E) inner mitochondrial membrane.
28.
The final electron acceptor in aerobic respiration is:
(A) water.
(B) oxygen.
(C) NAD+.
(D) FADH2.
(E) glucose.
29.
In aerobic respiration carbon dioxide is produced in:
(A) gycolysis.
(B) Krebs cycle.
(C) acetyl-coA production.
(D) the electron transport chain.
(E) B and C.
30.
The function of glycolysis is to:
(A) produce NADPH and ATP.
(B) produce the starting material for further energy extraction by oxidation.
(C) produce glucose.
(D) produce NADH and FADH2.
(E) make 36 ATP from one glucose molecule.
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31.
The net energetic products of Krebs cycle (per molecule of glucose) are:
(A) 2 ATP and 2 NADH.
(B) 2 ATP, 6 NADH, and 2 FADH2.
(C) 2 NADH.
(D) 36 ATP.
(E) one molecule of glucose and 9 ATP.
32.
In respiration, NADPH activates _____ proton pumps:
(A) 0.
(B) 2.
(C) 3.
(D) 4.
(E) 6.
33.
32 ATP net, rather than 34 ATP net, are theoretically made by the electron transport chain of respiration because:
(A) the NADH made by glycolysis has to be transported into the mitochondrial matrix.
(B) the NADH made by glycolysis has to be transported into the cytoplasm.
(C) the NADH made by Krebs cycle has to be transported into the mitochondrial matrix..
(D) the NADH made by Krebs cycle has to be transported into the cytoplasm.
(E) none of the above.
34.
The most efficient process (in the following list) of cellular respiration is:
(A) glycolysis.
(B) acetyl-coA production.
(C) Krebs cycle.
(D) Calvin cycle.
(E) light reactions.
35.
The length of most food chains is limited to __________ steps as a consequence of the efficiency of __________.
(A) 3 or 4, photosynthesis
(B) 3 or 4, aerobic respiration
(C) 5 or 6, photosynthesis
(D) 5 or 6, aerobic respiration
(E) 2 or 3, fermentation
36.
ATP is used to fuel:
(A) passive processes.
(B) endergonic reactions.
(C) diffusion.
(D) movement of water across the plasma membrane.
(E) all of the above.
37.
Which of the following is not a part of the ATP molecule?
(A) adenine.
(B) ribose sugar.
(C) deoxyribose sugar.
(D) phosphate.
(E) A and B.
38.
ATP is usually recycled from:
(A) DNA.
(B) AMP and inorganic phosphate.
(C) ADP and inorganic phosphate.
(D) AQP.
(E) None of the above, it is always made directly from sugar, base, and phosphate.
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39.
Endergonic reactions:
(A) Reactants contain more energy than the products.
(B) proceed spontaneously.
(C) energy is released.
(D) ∆G is positive.
(E) also known as a reversible reaction.
Use your study guide to prepare for the short answer questions (such as drawing/labeling graphs and figures, comparing and
contrasting respiration and photosynthesis, and composing essays).
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