Biology 111- Chapter 9 Test Bank
Latest Verified Review 2024 Practice Questions and
Answers for Exam Preparation, 100% Correct
Substrate-level phosphorylation occurs _____.
- Answer-in both glycolysis and the citric acid cycle
The molecule that functions as the reducing agent (electron donor) in a redox or
oxidation-reduction reaction _____.
- Answer-loses electrons and loses potential energy
When electrons move closer to a more electronegative atom, what happens? The more
electronegative atom is _____.
- Answer-reduced, and energy is released
Which of the listed statements describes the results of the following reaction?
C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + Energy
- Answer-C6H12O6 is oxidized and O2 is reduced.
When a glucose molecule loses a hydrogen atom as the result of an oxidation-reduction
reaction, the molecule becomes _____.
- Answer-oxidized
When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom
(not a proton), the molecule becomes _____.
- Answer-reduced
Which of the following statements about NAD+ is true?
- Answer-NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the
citric acid cycle.
The oxygen consumed during cellular respiration is involved directly in which process or
event?
- Answer-accepting electrons at the end of the electron transport chain
Carbohydrates and fats are considered high-energy foods because they _____.
- Answer-have a lot of electrons associated with hydrogen.
, Biology 111- Chapter 9 Test Bank
Latest Verified Review 2024 Practice Questions and
Answers for Exam Preparation, 100% Correct
A cell has enough available ATP to meet its needs for about 30 seconds. What is likely to
happen when an athlete exhausts his or her ATP supply?
- Answer-Catabolic processes are activated that generate more ATP.
Substrate-level phosphorylation accounts for approximately what percentage of the ATP
formed by the reactions of glycolysis?
- Answer-100%
The free energy for the oxidation of glucose to CO2 and water is -686 kcal/mol and the
free energy for the reduction of NAD+ to NADH is +53 kcal/mol. Why are only two
molecules of NADH formed during glycolysis when it appears that as many as a dozen
could be formed?
- Answer-Most of the free energy available from the oxidation of glucose remains in
pyruvate, one of the products of glycolysis.
Starting with one molecule of glucose, the energy-containing products of glycolysis are
_____. - Answer-2 NADH, 2 pyruvate, and 2 ATP
In glycolysis, for each molecule of glucose oxidized to pyruvate _____.
- Answer-two molecules of ATP are used and four molecules of ATP are produced.
Which kind of metabolic poison would most directly interfere with glycolysis?
- Answer-an agent that closely mimics the structure of glucose but is not
metabolized
Most of the CO2 from the catabolism of glucose is released during _____.
- Answer-the citric acid cycle
Following glycolysis and the citric acid cycle, but before the electron transport chain and
oxidative phosphorylation, the carbon skeleton of glucose has been broken down to CO2
with some net gain of ATP. Most of the energy from the original glucose molecule at that
point in the process, however, is in the form of _____.
- Answer-NADH
Latest Verified Review 2024 Practice Questions and
Answers for Exam Preparation, 100% Correct
Substrate-level phosphorylation occurs _____.
- Answer-in both glycolysis and the citric acid cycle
The molecule that functions as the reducing agent (electron donor) in a redox or
oxidation-reduction reaction _____.
- Answer-loses electrons and loses potential energy
When electrons move closer to a more electronegative atom, what happens? The more
electronegative atom is _____.
- Answer-reduced, and energy is released
Which of the listed statements describes the results of the following reaction?
C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + Energy
- Answer-C6H12O6 is oxidized and O2 is reduced.
When a glucose molecule loses a hydrogen atom as the result of an oxidation-reduction
reaction, the molecule becomes _____.
- Answer-oxidized
When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom
(not a proton), the molecule becomes _____.
- Answer-reduced
Which of the following statements about NAD+ is true?
- Answer-NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the
citric acid cycle.
The oxygen consumed during cellular respiration is involved directly in which process or
event?
- Answer-accepting electrons at the end of the electron transport chain
Carbohydrates and fats are considered high-energy foods because they _____.
- Answer-have a lot of electrons associated with hydrogen.
, Biology 111- Chapter 9 Test Bank
Latest Verified Review 2024 Practice Questions and
Answers for Exam Preparation, 100% Correct
A cell has enough available ATP to meet its needs for about 30 seconds. What is likely to
happen when an athlete exhausts his or her ATP supply?
- Answer-Catabolic processes are activated that generate more ATP.
Substrate-level phosphorylation accounts for approximately what percentage of the ATP
formed by the reactions of glycolysis?
- Answer-100%
The free energy for the oxidation of glucose to CO2 and water is -686 kcal/mol and the
free energy for the reduction of NAD+ to NADH is +53 kcal/mol. Why are only two
molecules of NADH formed during glycolysis when it appears that as many as a dozen
could be formed?
- Answer-Most of the free energy available from the oxidation of glucose remains in
pyruvate, one of the products of glycolysis.
Starting with one molecule of glucose, the energy-containing products of glycolysis are
_____. - Answer-2 NADH, 2 pyruvate, and 2 ATP
In glycolysis, for each molecule of glucose oxidized to pyruvate _____.
- Answer-two molecules of ATP are used and four molecules of ATP are produced.
Which kind of metabolic poison would most directly interfere with glycolysis?
- Answer-an agent that closely mimics the structure of glucose but is not
metabolized
Most of the CO2 from the catabolism of glucose is released during _____.
- Answer-the citric acid cycle
Following glycolysis and the citric acid cycle, but before the electron transport chain and
oxidative phosphorylation, the carbon skeleton of glucose has been broken down to CO2
with some net gain of ATP. Most of the energy from the original glucose molecule at that
point in the process, however, is in the form of _____.
- Answer-NADH
