BS 161 Exam 1 ACTUAL UPDATED
Questions and CORRECT Answers
In pyruvate oxidation, a three-carbon pyruvate molecule is converted to a two -carbon acetyl
group. What happened to the other carbon molecule? - CORRECT ANSWER - It was
released as CO2
Why is more ATP produced from the catabolism of 1 gram of fats compared to the amount of
ATP produced from catabolism of 1 gram of sugars? - CORRECT ANSWER - Because
fats have more C-H bonds that allow more NADH to be produced
When no oxygen is present, which pair of processes allow conversion of NAD+ to NADH and
then back to NAD+? - CORRECT ANSWER - Glycolysis and fermentation
Conversion of G3P to RuBP ___ energy and it is coupled to _____. - CORRECT
ANSWER - requires; conversion of ATP to ADP + Pi
The oxygen that enters cellular respiration is incorporated into: - CORRECT ANSWER -
H2O
What would happen to the light reactions if the Calvin cycle stopped converting NADPH to
NADP+? - CORRECT ANSWER - The light reactions would stop because NADP+ is
needed to accept electrons from the light reactions
When oxygen is present, which pair of processes allow conversion of NAD+ to NADH and then
back to NAD+? - CORRECT ANSWER - Pyruvate oxidation and the electron transport
chain
Which feature is shared by both chloroplasts and mitochondria? - CORRECT ANSWER -
A proton gradient is coupled to ATP synthesis
, In photosynthesis, the movement of protons from the stroma to thylakoid lumen is ______ and is
coupled to _____. - CORRECT ANSWER - unfavorable; the movement of energized from
PSII to PSI
The reaction shown below occurs in cells and is catalyzed by Enzyme X:
A+B⇄C
The concentrations of A, B, and C at equilibrium are as follows: [A] = 2 mM, [B] = 4 mM, [C] =
4 mM.
If molecule C is added such that [C] = 6 mM, how will this affect the reaction? - CORRECT
ANSWER - There will be a net production of A and B, because the reaction will proceed
towards achieving the ratio of products and substrates at equilibrium.
Which of the following is an end product the Calvin Cycle in photosynthesis? - CORRECT
ANSWER - Triose phosphate
ATP and NADPH produce during the photosynthesis electron transport are: - CORRECT
ANSWER - Used as substrates for Calvin Cycle
Photosynthesis in plants involves: - CORRECT ANSWER - Oxidation of H2O in the
photosynthetic electron transport chain and reduction of CO2 in the Calvin Cycle
Most of the triose phosphate produced by the Calvin cycle is used to regenerate RuBP, which is
the first reactant in the cycle. What outpurt of the light reactyions is directly required for t -
CORRECT ANSWER -
If the only inputs for cellulose hydrolysis are water and cellulose. Based on the model of Matter
and Energy Transformation from class, what happens energetically when cellulose is hydrolyzed
to glucose? - CORRECT ANSWER - free energy is neither lost nor gained
The formation of macromolecules from G3P is ___ and would be coupled to ____ - CORRECT
ANSWER - anabolic; ATP-> ADP
Questions and CORRECT Answers
In pyruvate oxidation, a three-carbon pyruvate molecule is converted to a two -carbon acetyl
group. What happened to the other carbon molecule? - CORRECT ANSWER - It was
released as CO2
Why is more ATP produced from the catabolism of 1 gram of fats compared to the amount of
ATP produced from catabolism of 1 gram of sugars? - CORRECT ANSWER - Because
fats have more C-H bonds that allow more NADH to be produced
When no oxygen is present, which pair of processes allow conversion of NAD+ to NADH and
then back to NAD+? - CORRECT ANSWER - Glycolysis and fermentation
Conversion of G3P to RuBP ___ energy and it is coupled to _____. - CORRECT
ANSWER - requires; conversion of ATP to ADP + Pi
The oxygen that enters cellular respiration is incorporated into: - CORRECT ANSWER -
H2O
What would happen to the light reactions if the Calvin cycle stopped converting NADPH to
NADP+? - CORRECT ANSWER - The light reactions would stop because NADP+ is
needed to accept electrons from the light reactions
When oxygen is present, which pair of processes allow conversion of NAD+ to NADH and then
back to NAD+? - CORRECT ANSWER - Pyruvate oxidation and the electron transport
chain
Which feature is shared by both chloroplasts and mitochondria? - CORRECT ANSWER -
A proton gradient is coupled to ATP synthesis
, In photosynthesis, the movement of protons from the stroma to thylakoid lumen is ______ and is
coupled to _____. - CORRECT ANSWER - unfavorable; the movement of energized from
PSII to PSI
The reaction shown below occurs in cells and is catalyzed by Enzyme X:
A+B⇄C
The concentrations of A, B, and C at equilibrium are as follows: [A] = 2 mM, [B] = 4 mM, [C] =
4 mM.
If molecule C is added such that [C] = 6 mM, how will this affect the reaction? - CORRECT
ANSWER - There will be a net production of A and B, because the reaction will proceed
towards achieving the ratio of products and substrates at equilibrium.
Which of the following is an end product the Calvin Cycle in photosynthesis? - CORRECT
ANSWER - Triose phosphate
ATP and NADPH produce during the photosynthesis electron transport are: - CORRECT
ANSWER - Used as substrates for Calvin Cycle
Photosynthesis in plants involves: - CORRECT ANSWER - Oxidation of H2O in the
photosynthetic electron transport chain and reduction of CO2 in the Calvin Cycle
Most of the triose phosphate produced by the Calvin cycle is used to regenerate RuBP, which is
the first reactant in the cycle. What outpurt of the light reactyions is directly required for t -
CORRECT ANSWER -
If the only inputs for cellulose hydrolysis are water and cellulose. Based on the model of Matter
and Energy Transformation from class, what happens energetically when cellulose is hydrolyzed
to glucose? - CORRECT ANSWER - free energy is neither lost nor gained
The formation of macromolecules from G3P is ___ and would be coupled to ____ - CORRECT
ANSWER - anabolic; ATP-> ADP
