PRINCIPLES OF BIOCHEMISTRY
LATEST EXAM 3 2025 ORGANIZED
QUESTIONS AND 100% CORRECT
EXPERT VERIFIED ANSWERS
GRADED A+ (BRAND NEW!!!!!!)
True or false? The light-dependent reactions of photosynthesis
use water and produce oxygen. - THE CORRECT ANSWER-true
Which of the following molecules is the primary product of
photosystem I? - THE CORRECT ANSWER-NADPH
What is the biological significance of the light-independent
reactions of photosynthesis? - THE CORRECT ANSWER-convert carbon
dioxide to sugar
Which of the following statements best describes the
relationship between the light-dependent and light-
independent reactions of photosynthesis? - THE CORRECT ANSWER-
The light-dependent reactions produce ATP and NADPH,
which are then used by the light-independent reactions.
Which of the following reactions ensures that the Calvin cycle
can make a continuous supply of glucose? - THE CORRECT ANSWER-
regeneration of RuBP
,In C3 plants the conservation of water promotes _____. - THE
CORRECT ANSWER-photo-respiration
In C4 and CAM plants carbon dioxide is fixed in the _____ of
mesophyll cells - THE CORRECT ANSWER-cytoplasm
C4 plants differ from C3 and CAM plants in that C4 plants
_____. - THE CORRECT ANSWER-transfer fixed carbon dioxide to
cells in which the Calvin cycle occurs
Which of these phosphorylates ADP to make ATP? - THE CORRECT
ANSWER-e-; ATP synthase
_____ releases energy that is used to pump hydrogen ions
from the stroma into the thylakoid compartment. - THE CORRECT
ANSWER-b
_____ splits water into 1/2 O2, H+, and e- . - THE CORRECT
ANSWER-a, photosystem II
Energized electrons from ____ enter an electron transport
chain and are then used to reduce NADP+ - THE CORRECT ANSWER-c,
photosystem I
Chlorophyll can be found in _____. - THE CORRECT ANSWER-A&C,
Photosystems I and II
,Which of the following statements about photosynthesis is
FALSE? - THE CORRECT ANSWER-In plants much of the carbohydrate
formed is stored as sucrose
The energy of a photon absorbed by an antenna molecule of the
photosystem finds it way to a chlorophyll molecule in the
reaction center of a light-harvesting complex by a process of: -
THE CORRECT ANSWER-resonance transfer and electron transfer.
Which of the following represents the CORRECT order of
events in the two-photosystem light reactions of
photosynthesis? - THE CORRECT ANSWER-Photosystem I receives
electrons from plastocyanin at the end of the electron transfer
chain from the excited reaction center of photosystem II.
Place the following events in the correct order for the two-
photosystem light reactions.
1) Electrons are transferred to the b6F complex with
concomitant influx of protons into the thylakoid lumen.
2) Electrons are passed through to ferredoxin and then
ultimately to NADP+, reducing the latter to NADPH.
3) Electrons are transferred to plastoquinones, which serve as
intermediate electron transporters.
4) Light energy is absorbed by photosystem II, placing it in an
excited state, causing it to release electrons, which are replaced
by the oxidation of water to oxygen.
5) Electrons are transferred to photosystem I via plastocyanin. -
THE CORRECT ANSWER-43152
, From the following choices, identify those that are the inputs
and outputs of the light reactions. (Recall that inputs to
chemical reactions are modified over the course of the reaction
as they are converted into products. In other words, if
something is required for a reaction to occur, and it does not
remain in its original form when the reaction is complete, it is
an input.)
Drag each item to the appropriate bin. If the item is not an
input to or an output from the light reactions, drag it to the "not
input or output" bin. - THE CORRECT ANSWER-input: water, light,
ADP, NADP+
output:'oxygen, ATP, NADPH
neither:co2, G3P, glucose
From the following choices, identify those that are the inputs
and outputs of the Calvin cycle.
Drag each item to the appropriate bin. If the item is not an
input to or an output from the Calvin cycle, drag it to the "not
input or output" bin. - THE CORRECT ANSWER-input:NADPH, ATP,
CO2
output: G3P, NADP+, ADP
neither: light, O2, glucose
In photosynthesis, a redox compound that is produced in the
light reactions is required to drive other redox reactions in the
Calvin cycle, as shown in this figure along with other
components of photosynthesis. - THE CORRECT ANSWER-1
water...oxygen
2 NADP+....NADPH
3 NADPH...NADP+
LATEST EXAM 3 2025 ORGANIZED
QUESTIONS AND 100% CORRECT
EXPERT VERIFIED ANSWERS
GRADED A+ (BRAND NEW!!!!!!)
True or false? The light-dependent reactions of photosynthesis
use water and produce oxygen. - THE CORRECT ANSWER-true
Which of the following molecules is the primary product of
photosystem I? - THE CORRECT ANSWER-NADPH
What is the biological significance of the light-independent
reactions of photosynthesis? - THE CORRECT ANSWER-convert carbon
dioxide to sugar
Which of the following statements best describes the
relationship between the light-dependent and light-
independent reactions of photosynthesis? - THE CORRECT ANSWER-
The light-dependent reactions produce ATP and NADPH,
which are then used by the light-independent reactions.
Which of the following reactions ensures that the Calvin cycle
can make a continuous supply of glucose? - THE CORRECT ANSWER-
regeneration of RuBP
,In C3 plants the conservation of water promotes _____. - THE
CORRECT ANSWER-photo-respiration
In C4 and CAM plants carbon dioxide is fixed in the _____ of
mesophyll cells - THE CORRECT ANSWER-cytoplasm
C4 plants differ from C3 and CAM plants in that C4 plants
_____. - THE CORRECT ANSWER-transfer fixed carbon dioxide to
cells in which the Calvin cycle occurs
Which of these phosphorylates ADP to make ATP? - THE CORRECT
ANSWER-e-; ATP synthase
_____ releases energy that is used to pump hydrogen ions
from the stroma into the thylakoid compartment. - THE CORRECT
ANSWER-b
_____ splits water into 1/2 O2, H+, and e- . - THE CORRECT
ANSWER-a, photosystem II
Energized electrons from ____ enter an electron transport
chain and are then used to reduce NADP+ - THE CORRECT ANSWER-c,
photosystem I
Chlorophyll can be found in _____. - THE CORRECT ANSWER-A&C,
Photosystems I and II
,Which of the following statements about photosynthesis is
FALSE? - THE CORRECT ANSWER-In plants much of the carbohydrate
formed is stored as sucrose
The energy of a photon absorbed by an antenna molecule of the
photosystem finds it way to a chlorophyll molecule in the
reaction center of a light-harvesting complex by a process of: -
THE CORRECT ANSWER-resonance transfer and electron transfer.
Which of the following represents the CORRECT order of
events in the two-photosystem light reactions of
photosynthesis? - THE CORRECT ANSWER-Photosystem I receives
electrons from plastocyanin at the end of the electron transfer
chain from the excited reaction center of photosystem II.
Place the following events in the correct order for the two-
photosystem light reactions.
1) Electrons are transferred to the b6F complex with
concomitant influx of protons into the thylakoid lumen.
2) Electrons are passed through to ferredoxin and then
ultimately to NADP+, reducing the latter to NADPH.
3) Electrons are transferred to plastoquinones, which serve as
intermediate electron transporters.
4) Light energy is absorbed by photosystem II, placing it in an
excited state, causing it to release electrons, which are replaced
by the oxidation of water to oxygen.
5) Electrons are transferred to photosystem I via plastocyanin. -
THE CORRECT ANSWER-43152
, From the following choices, identify those that are the inputs
and outputs of the light reactions. (Recall that inputs to
chemical reactions are modified over the course of the reaction
as they are converted into products. In other words, if
something is required for a reaction to occur, and it does not
remain in its original form when the reaction is complete, it is
an input.)
Drag each item to the appropriate bin. If the item is not an
input to or an output from the light reactions, drag it to the "not
input or output" bin. - THE CORRECT ANSWER-input: water, light,
ADP, NADP+
output:'oxygen, ATP, NADPH
neither:co2, G3P, glucose
From the following choices, identify those that are the inputs
and outputs of the Calvin cycle.
Drag each item to the appropriate bin. If the item is not an
input to or an output from the Calvin cycle, drag it to the "not
input or output" bin. - THE CORRECT ANSWER-input:NADPH, ATP,
CO2
output: G3P, NADP+, ADP
neither: light, O2, glucose
In photosynthesis, a redox compound that is produced in the
light reactions is required to drive other redox reactions in the
Calvin cycle, as shown in this figure along with other
components of photosynthesis. - THE CORRECT ANSWER-1
water...oxygen
2 NADP+....NADPH
3 NADPH...NADP+
