BIOS 1700 Exam 3 Questions with Correct Answers Latest Update 2025/2026
In eukaryotic cells, glycolysis occurs in - Answers the cytoplasm.
Which of the following is an electron carrier in its reduced form? - Answers NADH and FADH2
The glycolysis stage is responsible for producing most of the ATP during cellular respiration.
True/False - Answers False
The citric acid cycle takes place in the: - Answers mitochondrial matrix.
The immediate source of electrons for the electron transport chain is: - Answers NADH and
FADH2.
Fermentation produces nearly twice as much ATP as aerobic respiration, which explains why it
is a preferred pathway for bacteria.
True/False - Answers False
The storage carbohydrate in animals is ___________ and in plants is __________. - Answers
glycogen; starch
In pyruvate oxidation, the electron donor is _____ and the electron acceptor is _____. - Answers
pyruvate; NAD+
In the cleavage phase of glycolysis: - Answers a phosphorylated sugar molecule is broken apart
and the products rearranged.
In what organelle is pyruvate oxidation carried out in a cell? - Answers mitochondrion
Each molecule of acetyl-CoA that enters the citric acid cycle carries two of the carbon atoms
from the original starting glucose molecule. These carbon atoms will ultimately leave the citric
acid cycle as carbon atoms in which of the following? - Answers CO2
Where does the F1 subunit of ATP synthase get its energy to catalyze the synthesis of ATP? -
Answers from rotational energy provided by the flow of protons through the channel in the Fo
subunit
Lactic acid fermentation occurs in: - Answers bacteria and animals.
Proteins can be broken down to extract energy. They are typically broken down into amino acids,
which then enter cellular respiration via: - Answers glycolysis or the citric acid cycle.
Cellular respiration is a series of _____ reactions. - Answers catabolic
Which of the following are inputs, but not outputs, of glycolysis? - Answers Glucose
, When a single pyruvate is converted to acetyl-CoA during pyruvate oxidation, the other products
of the reaction are: - Answers NADH and CO2.
When you exhale, there is more CO2 than was present in the air that you inhaled. This CO2
comes from reactions in: - Answers pyruvate oxidation and the citric acid cycle.
Which correctly characterizes the F1 subunit of ATP synthase? - Answers It is the catalytic unit
that synthesizes ATP.
Which statement is true regarding Earth's earliest organisms? - Answers These organisms likely
carried out fermentation and may have had rudimentary proton pumps.
The enzyme phosphofructokinase-1 (PFK-1) is thought of as a metabolic "valve" that regulates
the rate of glycolysis. Which of the following correctly identifies its allosteric activators and
inhibitors and their actions? - Answers ADP-activator; citrate-inhibitor
During glycolysis, pyruvate oxidation, and the citric acid cycle, the chemical energy in glucose is
transferred to: - Answers electron carriers and ATP.
Which of the following is required for the preparatory phase of glycolysis and then produced
during the payoff phase? - Answers ATP
Tracing the metabolism of one glucose molecule, how many carbon atoms are available for
further oxidation at the completion of the pyruvate oxidation stage? - Answers 4
Once they have been processed through the citric acid cycle, the acetyl-CoA molecules from a
single glucose molecule produce: - Answers 2 ATP, 6 NADH, 4 CO2, and 2 FADH2
A simplified overall equation for respiration is as follows:
C6H12O6 + 6O2 →6CO2+ 6H2O + energy In this reaction, we can say that _____ is reduced and
_____ is oxidized. - Answers oxygen; glucose
The chemical bonds of carbohydrates and lipids have high potential energy because: - Answers
many of these bonds are C—C and C—H bonds, in which electrons are shared equally between
atoms.
Which of the following is a product (as opposed to a substrate) of at least one of the processes
of cellular respiration?
Please choose the correct answer from the following choices, and then select the submit
answer button. - Answers water
In cellular respiration, glucose is _____ to CO2 and oxygen is _____ to water. - Answers oxidized;
reduced
Tracing the metabolism of one glucose molecule, how many carbon atoms are fully oxidized to
In eukaryotic cells, glycolysis occurs in - Answers the cytoplasm.
Which of the following is an electron carrier in its reduced form? - Answers NADH and FADH2
The glycolysis stage is responsible for producing most of the ATP during cellular respiration.
True/False - Answers False
The citric acid cycle takes place in the: - Answers mitochondrial matrix.
The immediate source of electrons for the electron transport chain is: - Answers NADH and
FADH2.
Fermentation produces nearly twice as much ATP as aerobic respiration, which explains why it
is a preferred pathway for bacteria.
True/False - Answers False
The storage carbohydrate in animals is ___________ and in plants is __________. - Answers
glycogen; starch
In pyruvate oxidation, the electron donor is _____ and the electron acceptor is _____. - Answers
pyruvate; NAD+
In the cleavage phase of glycolysis: - Answers a phosphorylated sugar molecule is broken apart
and the products rearranged.
In what organelle is pyruvate oxidation carried out in a cell? - Answers mitochondrion
Each molecule of acetyl-CoA that enters the citric acid cycle carries two of the carbon atoms
from the original starting glucose molecule. These carbon atoms will ultimately leave the citric
acid cycle as carbon atoms in which of the following? - Answers CO2
Where does the F1 subunit of ATP synthase get its energy to catalyze the synthesis of ATP? -
Answers from rotational energy provided by the flow of protons through the channel in the Fo
subunit
Lactic acid fermentation occurs in: - Answers bacteria and animals.
Proteins can be broken down to extract energy. They are typically broken down into amino acids,
which then enter cellular respiration via: - Answers glycolysis or the citric acid cycle.
Cellular respiration is a series of _____ reactions. - Answers catabolic
Which of the following are inputs, but not outputs, of glycolysis? - Answers Glucose
, When a single pyruvate is converted to acetyl-CoA during pyruvate oxidation, the other products
of the reaction are: - Answers NADH and CO2.
When you exhale, there is more CO2 than was present in the air that you inhaled. This CO2
comes from reactions in: - Answers pyruvate oxidation and the citric acid cycle.
Which correctly characterizes the F1 subunit of ATP synthase? - Answers It is the catalytic unit
that synthesizes ATP.
Which statement is true regarding Earth's earliest organisms? - Answers These organisms likely
carried out fermentation and may have had rudimentary proton pumps.
The enzyme phosphofructokinase-1 (PFK-1) is thought of as a metabolic "valve" that regulates
the rate of glycolysis. Which of the following correctly identifies its allosteric activators and
inhibitors and their actions? - Answers ADP-activator; citrate-inhibitor
During glycolysis, pyruvate oxidation, and the citric acid cycle, the chemical energy in glucose is
transferred to: - Answers electron carriers and ATP.
Which of the following is required for the preparatory phase of glycolysis and then produced
during the payoff phase? - Answers ATP
Tracing the metabolism of one glucose molecule, how many carbon atoms are available for
further oxidation at the completion of the pyruvate oxidation stage? - Answers 4
Once they have been processed through the citric acid cycle, the acetyl-CoA molecules from a
single glucose molecule produce: - Answers 2 ATP, 6 NADH, 4 CO2, and 2 FADH2
A simplified overall equation for respiration is as follows:
C6H12O6 + 6O2 →6CO2+ 6H2O + energy In this reaction, we can say that _____ is reduced and
_____ is oxidized. - Answers oxygen; glucose
The chemical bonds of carbohydrates and lipids have high potential energy because: - Answers
many of these bonds are C—C and C—H bonds, in which electrons are shared equally between
atoms.
Which of the following is a product (as opposed to a substrate) of at least one of the processes
of cellular respiration?
Please choose the correct answer from the following choices, and then select the submit
answer button. - Answers water
In cellular respiration, glucose is _____ to CO2 and oxygen is _____ to water. - Answers oxidized;
reduced
Tracing the metabolism of one glucose molecule, how many carbon atoms are fully oxidized to
