Download Practice Test Chapter 9

Practice Test Chapter 9
Name___________________________________
1) The molecule that functions as the reducing agent (electron donor) in a redox or
oxidation-reduction reaction
A) loses electrons and loses energy.
B) gains electrons and gains energy.
C) gains electrons and loses energy.
D) neither gains nor loses electrons, but gains or loses energy.
E) loses electrons and gains energy.
1)
2) When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom (not a
hydrogen ion) the molecule becomes
A) reduced.
B) a reducing agent.
C) oxidized.
D) hydrogenated.
E) redoxed.
2)
3) Where does glycolysis takes place?
A) mitochondrial intermembrane space
B) cytosol
C) mitochondrial matrix
D) mitochondrial inner membrane
E) mitochondrial outer membrane
3)
4) Which process in eukaryotic cells will proceed normally whether oxygen (O2 ) is present or absent?
4)
5) In addition to ATP, what are the end products of glycolysis?
A) CO2 and H2 O
5)
A) the citric acid cycle
B) oxidative phosphorylation
C) chemiosmosis
D) glycolysis
E) electron transport
B) H2 O, FADH2 , and citrate
C) CO2 and NADH
D) CO2 and pyruvate
E) NADH and pyruvate
6) In glycolysis, for each molecule of glucose oxidized to pyruvate
A) 2 molecules of ATP are used and 2 molecules of ATP are produced.
B) 2 molecules of ATP are used and 4 molecules of ATP are produced.
C) 2 molecules of ATP are used and 6 molecules of ATP are produced.
D) 6 molecules of ATP are used and 6 molecules of ATP are produced.
E) 4 molecules of ATP are used and 2 molecules of ATP are produced.
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6)
7) Which of the following molecules enters the citric acid cycle and is formed, in part, by the removal
of a carbon (CO2 ) from one molecule of pyruvate?
7)
8) During aerobic respiration, electrons travel downhill in which sequence?
A) food citric acid cycle ATP NAD+
B) food glycolysis citric acid cycle NADH ATP
C) glucose ATP electron transport chain NADH
D) food NADH electron transport chain oxygen
E) glucose pyruvate ATP oxygen
8)
9) Cellular respiration harvests the most chemical energy from which of the following?
A) generating carbon dioxide and oxygen in the electron transport chain
B) chemiosmosis
C) transferring electrons from organic molecules to pyruvate
D) substrate-level phosphorylation
E) converting oxygen to ATP
9)
A) glyceraldehydes-3-phosphate
B) oxaloacetate
C) acetyl CoA
D) citrate
E) lactate
10) In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert
ADP + Pi to ATP?
10)
11) Which of the following occurs in the cytosol of a eukaryotic cell?
A) oxidation of pyruvate to acetyl CoA
B) glycolysis and fermentation
C) oxidative phosphorylation
D) fermentation and chemiosmosis
E) citric acid cycle
11)
12) Phosphofructokinase is an allosteric enzyme that catalyzes the conversion of fructose-6-phosphate
to fructose-1,6-bisphosphate, an early step of glycolysis. In the presence of oxygen, an increase in
the amount ATP in a cell would be expected to
A) activate the enzyme and increase the rates of glycolysis and the citric acid cycle.
B) activate the enzyme and thus slow the rates of glycolysis and the citric acid cycle.
C) inhibit the enzyme and thus increase the rate of glycolysis and the concentration of citrate.
D) inhibit the enzyme and thus slow the rates of glycolysis and the citric acid cycle.
E) inhibit the enzyme and thus increase the rates of glycolysis and the citric acid cycle.
12)
A) energy released from movement of protons through ATP synthase
B) energy released as electrons flow through the electron transport system
C) No external source of energy is required because the reaction is exergonic.
D) energy released from substrate-level phosphorylation
E) energy released from ATP synthase pumping hydrogen ions from the mitochondrial matrix
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13) The direct energy source that drives ATP synthesis during respiratory oxidative phosphorylation is
A) the difference in H+ concentrations on opposite sides of the inner mitochondrial membrane.
B) the thermodynamically favorable flow of electrons from NADH to the mitochondrial electron
transport carriers.
C) oxidation of glucose to CO2 and water.
13)
14) Which of the following describes ubiquinone?
A) a vitamin needed for efficient glycolysis
B) a small hydrophobic molecule in the electron transport chain
C) an essential amino acid
D) a protein in the electron transport chain
E) a substrate for synthesis of FADH
14)
D) the thermodynamically favorable transfer of phosphate from glycolysis and the citric acid
cycle intermediate molecules of ADP.
E) the final transfer of electrons to oxygen.
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