CAMPBELL BIOLOGY CHAPTER 10 QUESTIONS AND
ANSWERS LATEST UPDATED 2025/2026 A COMPLETE
EXAM SOLUTION ALL ANSWERS 100% CORRECT
DETAILED RATED A+ FOR SUCCESS
A - CORRECT ANSWERS Where are the molecules of the electron transport chain found
in plant cells? A) thylakoid membranes of chloroplasts B) stroma of chloroplasts C) inner
membrane of mitochondria D) matrix of mitochondria E) cytoplasm
C - CORRECT ANSWERS Synthesis of ATP by the chemiosmotic mechanism occurs
during A) photosynthesis. B) respiration. C) both photosynthesis and respiration. D) neither
photosynthesis nor respiration. E) photorespiration.
B - CORRECT ANSWERS Reduction of oxygen which forms water occurs during A)
photosynthesis. B) respiration. C) both photosynthesis and respiration. D) neither
photosynthesis nor respiration. E) photorespiration.
A - CORRECT ANSWERS Reduction of NADP+ occurs during A) photosynthesis. B)
respiration. C) both photosynthesis and respiration. D) neither photosynthesis nor respiration.
E) photorespiration.
D - CORRECT ANSWERS The splitting of carbon dioxide to form oxygen gas and carbon
compounds occurs during A) photosynthesis. B) respiration. C) both photosynthesis and
respiration. D) neither photosynthesis nor respiration. E) photorespiration.
C - CORRECT ANSWERS Generation of proton gradients across membranes occurs
during A) photosynthesis. B) respiration. C) both photosynthesis and respiration. D) neither
photosynthesis nor respiration. E) photorespiration.
B - CORRECT ANSWERS What is the relationship between wavelength of light and the
quantity of energy per photon? A) They have a direct, linear relationship. B) They are inversely
related. C) They are logarithmically related. D) They are separate phenomena. E) They are only
related in certain parts of the spectrum
, CAMPBELL BIOLOGY CHAPTER 10 QUESTIONS AND
ANSWERS LATEST UPDATED 2025/2026 A COMPLETE
EXAM SOLUTION ALL ANSWERS 100% CORRECT
DETAILED RATED A+ FOR SUCCESS
C - CORRECT ANSWERS In a protein complex for the light reaction (a reaction center),
energy is transferred from pigment molecule to pigment molecule, to a special chlorophyll a
molecule, and eventually to the primary electron acceptor. Why does this occur? A) The action
spectrum of that molecule is such that it is different from other molecules of chlorophyll. B) The
potential energy of the electron has to go back to the ground state. C) The molecular
environment lets it boost an electron to a higher energy level and also to transfer the electron
to another molecule. D) Each pigment molecule has to be able to act independently to excite
electrons. E) These chlorophyll a molecules are associated with higher concentrations of ATP.
D - CORRECT ANSWERS P680+ is said to be the strongest biological oxidizing agent.
Why? A) It is the receptor for the most excited electron in either photosystem. B) It is the
molecule that transfers electrons to plastoquinone (Pq) of the electron transfer system. C)
NADP reductase will then catalyze the shift of the electron from Fd to NADP+ to reduce it to
NADPH. D) This molecule results from the transfer of an electron to the primary electron
acceptor of photosystem II and strongly attracts another electron. E) This molecule is found far
more frequently among bacteria as well as in plants and plantlike Protists.
B - CORRECT ANSWERS Some photosynthetic bacteria (e.g., purple sulfur bacteria)
have photosystem I but not II, while others (e.g. cyanobacteria) have both PSI and PSII. Which
of the following might this observation imply? A) Photosystem II must have been selected
against in some species. B) Photosystem I must be more ancestral. C) Photosystem II may have
evolved to be more photoprotective. D) Cyclic flow must be more primitive than linear flow of
electrons. E) Cyclic flow must be the most necessary of the two processes.
A - CORRECT ANSWERS Cyclic electron flow may be photoprotective (protective to
light-induced damage). Which of the following experiments could provide information on this
phenomenon? A) using mutated organisms that can grow but that cannot carry out cyclic flow
of electrons and compare their abilities to photosynthesize in different light intensities B) using
plants that can carry out both linear and cyclic electron flow, or only one or another of thee
processes, and measuring their light absorbance C) using bacteria that have only cyclic flow and
ANSWERS LATEST UPDATED 2025/2026 A COMPLETE
EXAM SOLUTION ALL ANSWERS 100% CORRECT
DETAILED RATED A+ FOR SUCCESS
A - CORRECT ANSWERS Where are the molecules of the electron transport chain found
in plant cells? A) thylakoid membranes of chloroplasts B) stroma of chloroplasts C) inner
membrane of mitochondria D) matrix of mitochondria E) cytoplasm
C - CORRECT ANSWERS Synthesis of ATP by the chemiosmotic mechanism occurs
during A) photosynthesis. B) respiration. C) both photosynthesis and respiration. D) neither
photosynthesis nor respiration. E) photorespiration.
B - CORRECT ANSWERS Reduction of oxygen which forms water occurs during A)
photosynthesis. B) respiration. C) both photosynthesis and respiration. D) neither
photosynthesis nor respiration. E) photorespiration.
A - CORRECT ANSWERS Reduction of NADP+ occurs during A) photosynthesis. B)
respiration. C) both photosynthesis and respiration. D) neither photosynthesis nor respiration.
E) photorespiration.
D - CORRECT ANSWERS The splitting of carbon dioxide to form oxygen gas and carbon
compounds occurs during A) photosynthesis. B) respiration. C) both photosynthesis and
respiration. D) neither photosynthesis nor respiration. E) photorespiration.
C - CORRECT ANSWERS Generation of proton gradients across membranes occurs
during A) photosynthesis. B) respiration. C) both photosynthesis and respiration. D) neither
photosynthesis nor respiration. E) photorespiration.
B - CORRECT ANSWERS What is the relationship between wavelength of light and the
quantity of energy per photon? A) They have a direct, linear relationship. B) They are inversely
related. C) They are logarithmically related. D) They are separate phenomena. E) They are only
related in certain parts of the spectrum
, CAMPBELL BIOLOGY CHAPTER 10 QUESTIONS AND
ANSWERS LATEST UPDATED 2025/2026 A COMPLETE
EXAM SOLUTION ALL ANSWERS 100% CORRECT
DETAILED RATED A+ FOR SUCCESS
C - CORRECT ANSWERS In a protein complex for the light reaction (a reaction center),
energy is transferred from pigment molecule to pigment molecule, to a special chlorophyll a
molecule, and eventually to the primary electron acceptor. Why does this occur? A) The action
spectrum of that molecule is such that it is different from other molecules of chlorophyll. B) The
potential energy of the electron has to go back to the ground state. C) The molecular
environment lets it boost an electron to a higher energy level and also to transfer the electron
to another molecule. D) Each pigment molecule has to be able to act independently to excite
electrons. E) These chlorophyll a molecules are associated with higher concentrations of ATP.
D - CORRECT ANSWERS P680+ is said to be the strongest biological oxidizing agent.
Why? A) It is the receptor for the most excited electron in either photosystem. B) It is the
molecule that transfers electrons to plastoquinone (Pq) of the electron transfer system. C)
NADP reductase will then catalyze the shift of the electron from Fd to NADP+ to reduce it to
NADPH. D) This molecule results from the transfer of an electron to the primary electron
acceptor of photosystem II and strongly attracts another electron. E) This molecule is found far
more frequently among bacteria as well as in plants and plantlike Protists.
B - CORRECT ANSWERS Some photosynthetic bacteria (e.g., purple sulfur bacteria)
have photosystem I but not II, while others (e.g. cyanobacteria) have both PSI and PSII. Which
of the following might this observation imply? A) Photosystem II must have been selected
against in some species. B) Photosystem I must be more ancestral. C) Photosystem II may have
evolved to be more photoprotective. D) Cyclic flow must be more primitive than linear flow of
electrons. E) Cyclic flow must be the most necessary of the two processes.
A - CORRECT ANSWERS Cyclic electron flow may be photoprotective (protective to
light-induced damage). Which of the following experiments could provide information on this
phenomenon? A) using mutated organisms that can grow but that cannot carry out cyclic flow
of electrons and compare their abilities to photosynthesize in different light intensities B) using
plants that can carry out both linear and cyclic electron flow, or only one or another of thee
processes, and measuring their light absorbance C) using bacteria that have only cyclic flow and
