BIOC 385 Final Exam questions well
answered graded A+
All of the following are true of both chloroplasts and mitochondria EXCEPT that they
a) have one highly folded membrane
b) produce ATP inside the organelle
c) produce NADPH inside the organelle
d) are present in photosynthetic plants - correct answer ✔✔c) produce NADPH inside the
organelle
The chloroplast contains a highly folded membrane called the
a) thylakoid
b) lumen
c) inner membrane
d) matrix - correct answer ✔✔a) thylakoid
On excitation by a photon, a fate of the excited chlorophyll molecule is to
,a) transfer an electron to an acceptor molecule
b) transfer an electron to ATP
c) relax and release a proton to a neighboring chlorophyll
d) relax and accept an electron from a nearby donor - correct answer ✔✔a) transfer an electron
to an acceptor molecule
Approximately how many light-harvesting chromophores are found per photosystem enzyme,
such as in PSI or PSII? - correct answer ✔✔About 100 to 200
The following picture is an example of what phenomenon? - correct answer ✔✔resonance
energy transfer
The photosynthetic Z scheme describes the - correct answer ✔✔movement of electrons driven
by the absorption of light every.
What group in photosystem II (PSII) directly reacts with h2o during its light driven oxidation? -
correct answer ✔✔oxygen evolving center
Which is NOT a correct analogy between the photosynthetic PQ cycle and the mitochondrial
electron transport chain Q cycle?
a) Plastocyanin is analogous to cytochrome c
b) Plastocyanin is analogous to coenzyme Q.
, c) Cytochrome b6f is analogous to Complex III
d) Photosystem I is analogous to Complex I. - correct answer ✔✔d) Photosystem I is analogous
to Complex I.
In addition to the pumping of protons with the photosynthetic electron transport, what else
contributes to establishing a proton gradient? - correct answer ✔✔the formation of O2 from
two H2O
The herbicide paraquat operates by stealing electrons from photosystem I (PSI). Which of the
following is true of chloroplasts treated with paraquat? - correct answer ✔✔NADPH levels drop
Per O2 molecule generated in photosynthesis light reactionis, approximately how many protons
are moved across the thylakoid membrane? - correct answer ✔✔12
Approximately how many ATP are synthesized per O2 molecule generated in photosynthesis
light reactions? - correct answer ✔✔3
Which protein or enzyme is NOT involved in the cyclic photophosphorylation pathway?
a) ferredoxin
b) photosystem II
c) cytochrome b6f
d) plastocyanin - correct answer ✔✔b) photosystem II
answered graded A+
All of the following are true of both chloroplasts and mitochondria EXCEPT that they
a) have one highly folded membrane
b) produce ATP inside the organelle
c) produce NADPH inside the organelle
d) are present in photosynthetic plants - correct answer ✔✔c) produce NADPH inside the
organelle
The chloroplast contains a highly folded membrane called the
a) thylakoid
b) lumen
c) inner membrane
d) matrix - correct answer ✔✔a) thylakoid
On excitation by a photon, a fate of the excited chlorophyll molecule is to
,a) transfer an electron to an acceptor molecule
b) transfer an electron to ATP
c) relax and release a proton to a neighboring chlorophyll
d) relax and accept an electron from a nearby donor - correct answer ✔✔a) transfer an electron
to an acceptor molecule
Approximately how many light-harvesting chromophores are found per photosystem enzyme,
such as in PSI or PSII? - correct answer ✔✔About 100 to 200
The following picture is an example of what phenomenon? - correct answer ✔✔resonance
energy transfer
The photosynthetic Z scheme describes the - correct answer ✔✔movement of electrons driven
by the absorption of light every.
What group in photosystem II (PSII) directly reacts with h2o during its light driven oxidation? -
correct answer ✔✔oxygen evolving center
Which is NOT a correct analogy between the photosynthetic PQ cycle and the mitochondrial
electron transport chain Q cycle?
a) Plastocyanin is analogous to cytochrome c
b) Plastocyanin is analogous to coenzyme Q.
, c) Cytochrome b6f is analogous to Complex III
d) Photosystem I is analogous to Complex I. - correct answer ✔✔d) Photosystem I is analogous
to Complex I.
In addition to the pumping of protons with the photosynthetic electron transport, what else
contributes to establishing a proton gradient? - correct answer ✔✔the formation of O2 from
two H2O
The herbicide paraquat operates by stealing electrons from photosystem I (PSI). Which of the
following is true of chloroplasts treated with paraquat? - correct answer ✔✔NADPH levels drop
Per O2 molecule generated in photosynthesis light reactionis, approximately how many protons
are moved across the thylakoid membrane? - correct answer ✔✔12
Approximately how many ATP are synthesized per O2 molecule generated in photosynthesis
light reactions? - correct answer ✔✔3
Which protein or enzyme is NOT involved in the cyclic photophosphorylation pathway?
a) ferredoxin
b) photosystem II
c) cytochrome b6f
d) plastocyanin - correct answer ✔✔b) photosystem II
