BSC 2010 EXAM 3--STEVEN LATEST
MARKS EXAM QUESTIONS AND
ANSWERS 2026 - 2027
Which of the following molecules in the process of glycolysis
possesses the most chemical energy?
Fructose-1,6-bisphosphate
Which of the following processes generates most of the NADH that
delivers electrons to the electron transport chain?
The citric acid cycle
In the citric acid cycle, for each pyruvate that enters the cycle, one
ATP, three NADH, and one FADH2 are produced. For each glucose
molecule that enters glycolysis, how many ATP, NADH, and FADH2
are produced in the citric acid cycle?
Two ATP, six NADH, two FADH2
How many molecules of ATP are gained by substrate-level
phosphorylation from the complete breakdown of a single molecule
of glucose in the presence of oxygen?
4
After completion of the citric acid cycle, most of the usable energy
from the original glucose molecule is in the form of __________.
NADH
Which of the following events accompanies the conversion of
pyruvate to acetyl CoA before the citric acid cycle?
Release of CO2 and synthesis of NADH
END OF
PAGE
1
, BSC 2010 EXAM 3--STEVEN LATEST
MARKS EXAM QUESTIONS AND
ANSWERS 2026 - 2027
When a poison such as cyanide blocks the electron transport chain,
glycolysis and the citric acid cycle also eventually stop working.
Which of the following is the best explanation for this?
NAD+ and FAD are not available for glycolysis and the citric acid cycle
to continue
Most of the electrons removed from glucose by cellular respiration
are used for which of the following processes?
-Reducing NAD+ to NADH in glycolysis and the citric acid cycle
-Producing a proton gradient for ATP synthesis in the mitochondria
Each ATP molecule contains about 1% of the amount of chemical
energy available from the complete oxidation of a single glucose
molecule. Cellular respiration produces about 32 ATP from one
glucose molecule. What happens to the rest of the energy in glucose?
It is converted to heat
During aerobic respiration, molecular oxygen (O2) is used for which
of the following purposes?
At the end of the electron transport chain to accept electrons and form
H2O
Which of the following substances is/are involved in oxidative
phosphorylation?
END OF
PAGE
2
, BSC 2010 EXAM 3--STEVEN LATEST
MARKS EXAM QUESTIONS AND
ANSWERS 2026 - 2027
Oxygen
ADP
ATP
When solid tumors of animals reach a certain size, the center of the
tumor begins to die. To prevent this, the tumor can recruit new
blood vessels. What purpose does the recruitment of blood vessels to
growing tumors serve?
It supplies oxygen so that aerobic cellular respiration can occur instead
of fermentation, and it supplies glucose to the rapidly dividing cells of
the tumor.
Fermentation is essentially glycolysis plus an extra step in which
pyruvate is reduced to form lactate or alcohol and carbon dioxide.
This last step __________.
enables the cell to recycle the reduced NADH to oxidized NAD+
In glycolysis in the absence of oxygen, cells need a way to regenerate
which compound?
NAD+
Muscle tissues make lactate from pyruvate to do which of the
following?
Regenerate NAD+
END OF
PAGE
3
, BSC 2010 EXAM 3--STEVEN LATEST
MARKS EXAM QUESTIONS AND
ANSWERS 2026 - 2027
Of the listed metabolic pathways, which is the only pathway found
in all organisms?
Glycolysis
If significant amounts of materials are removed from the citric acid
cycle to produce amino acids for protein synthesis, which of the
following will result?
Less ATP will be produced by the cell.
Less CO2 will be produced by the cell.
The four-carbon compound that combines with acetyl CoA will have to
be made by some other process.
How does carbon dioxide enter the leaf?
Through the stomata
Chlorophyll molecules are in which part of the chloroplast?
Thylakoid membranes
The source of the oxygen produced by photosynthesis has been
identified through experiments using radioactive tracers. The
oxygen comes from __________.
water
Molecular oxygen is produced during __________.
linear electron flow during the light reactions
END OF
PAGE
4
MARKS EXAM QUESTIONS AND
ANSWERS 2026 - 2027
Which of the following molecules in the process of glycolysis
possesses the most chemical energy?
Fructose-1,6-bisphosphate
Which of the following processes generates most of the NADH that
delivers electrons to the electron transport chain?
The citric acid cycle
In the citric acid cycle, for each pyruvate that enters the cycle, one
ATP, three NADH, and one FADH2 are produced. For each glucose
molecule that enters glycolysis, how many ATP, NADH, and FADH2
are produced in the citric acid cycle?
Two ATP, six NADH, two FADH2
How many molecules of ATP are gained by substrate-level
phosphorylation from the complete breakdown of a single molecule
of glucose in the presence of oxygen?
4
After completion of the citric acid cycle, most of the usable energy
from the original glucose molecule is in the form of __________.
NADH
Which of the following events accompanies the conversion of
pyruvate to acetyl CoA before the citric acid cycle?
Release of CO2 and synthesis of NADH
END OF
PAGE
1
, BSC 2010 EXAM 3--STEVEN LATEST
MARKS EXAM QUESTIONS AND
ANSWERS 2026 - 2027
When a poison such as cyanide blocks the electron transport chain,
glycolysis and the citric acid cycle also eventually stop working.
Which of the following is the best explanation for this?
NAD+ and FAD are not available for glycolysis and the citric acid cycle
to continue
Most of the electrons removed from glucose by cellular respiration
are used for which of the following processes?
-Reducing NAD+ to NADH in glycolysis and the citric acid cycle
-Producing a proton gradient for ATP synthesis in the mitochondria
Each ATP molecule contains about 1% of the amount of chemical
energy available from the complete oxidation of a single glucose
molecule. Cellular respiration produces about 32 ATP from one
glucose molecule. What happens to the rest of the energy in glucose?
It is converted to heat
During aerobic respiration, molecular oxygen (O2) is used for which
of the following purposes?
At the end of the electron transport chain to accept electrons and form
H2O
Which of the following substances is/are involved in oxidative
phosphorylation?
END OF
PAGE
2
, BSC 2010 EXAM 3--STEVEN LATEST
MARKS EXAM QUESTIONS AND
ANSWERS 2026 - 2027
Oxygen
ADP
ATP
When solid tumors of animals reach a certain size, the center of the
tumor begins to die. To prevent this, the tumor can recruit new
blood vessels. What purpose does the recruitment of blood vessels to
growing tumors serve?
It supplies oxygen so that aerobic cellular respiration can occur instead
of fermentation, and it supplies glucose to the rapidly dividing cells of
the tumor.
Fermentation is essentially glycolysis plus an extra step in which
pyruvate is reduced to form lactate or alcohol and carbon dioxide.
This last step __________.
enables the cell to recycle the reduced NADH to oxidized NAD+
In glycolysis in the absence of oxygen, cells need a way to regenerate
which compound?
NAD+
Muscle tissues make lactate from pyruvate to do which of the
following?
Regenerate NAD+
END OF
PAGE
3
, BSC 2010 EXAM 3--STEVEN LATEST
MARKS EXAM QUESTIONS AND
ANSWERS 2026 - 2027
Of the listed metabolic pathways, which is the only pathway found
in all organisms?
Glycolysis
If significant amounts of materials are removed from the citric acid
cycle to produce amino acids for protein synthesis, which of the
following will result?
Less ATP will be produced by the cell.
Less CO2 will be produced by the cell.
The four-carbon compound that combines with acetyl CoA will have to
be made by some other process.
How does carbon dioxide enter the leaf?
Through the stomata
Chlorophyll molecules are in which part of the chloroplast?
Thylakoid membranes
The source of the oxygen produced by photosynthesis has been
identified through experiments using radioactive tracers. The
oxygen comes from __________.
water
Molecular oxygen is produced during __________.
linear electron flow during the light reactions
END OF
PAGE
4
