Deck 22: The Light Reactions

Question 1

P700 is the pigment reaction center for ________________.

Answer 1

photosystem I

Question 2

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) 960 nm
b) magnesium
c) ATP synthase
d) chloroplasts
e) thylakoids
f) copper
g) β-carotene
h) 680 nm
i) FAD
j) chlorophyll a
k) ferredoxin b
l) resonance energy transfer
Photosynthesis takes place in ____________.

Answer 2

d

Question 3

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) 960 nm
b) magnesium
c) ATP synthase
d) chloroplasts
e) thylakoids
f) copper
g) β-carotene
h) 680 nm
i) FAD
j) chlorophyll a
k) ferredoxin b
l) resonance energy transfer
____________: Membranous structures in a chloroplast that are stacked, flattened disks.

Answer 3

e

Question 4

In the light reactions of photosynthesis, the cooperation between photosystem I and photosystem II creates a flow of electrons from H2O to ________________.

Question 5

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) 960 nm
b) magnesium
c) ATP synthase
d) chloroplasts
e) thylakoids
f) copper
g) β-carotene
h) 680 nm
i) FAD
j) chlorophyll a
k) ferredoxin b
l) resonance energy transfer
____________: Plastocyanin requires this cofactor for activity.

Question 6

The transfer of excitation energy from one molecule to one nearby through electromagnetic interactions is called ________________.

Question 7

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) 960 nm
b) magnesium
c) ATP synthase
d) chloroplasts
e) thylakoids
f) copper
g) β-carotene
h) 680 nm
i) FAD
j) chlorophyll a
k) ferredoxin b
l) resonance energy transfer
The prosthetic group of ferredoxin-NADP+ reductase is ____________.

Question 8

The light-induced electron transfer in photosynthesis results in the transfer of _______________ into the thylakoid space.

Question 9

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) 960 nm
b) magnesium
c) ATP synthase
d) chloroplasts
e) thylakoids
f) copper
g) β-carotene
h) 680 nm
i) FAD
j) chlorophyll a
k) ferredoxin b
l) resonance energy transfer
The principal photoreceptor in chloroplasts of green plants is ____________.

Question 10

Electrons flow from photosystem I to photosystem II through the ________________ complex.

Question 11

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) 960 nm
b) magnesium
c) ATP synthase
d) chloroplasts
e) thylakoids
f) copper
g) β-carotene
h) 680 nm
i) FAD
j) chlorophyll a
k) ferredoxin b
l) resonance energy transfer
____________: This electron carrier of photosystem I is an iron-sulfur protein.

Question 12

In ________________, ATP is generated without the concomitant formation of NADPH.

Question 13

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) 960 nm
b) magnesium
c) ATP synthase
d) chloroplasts
e) thylakoids
f) copper
g) β-carotene
h) 680 nm
i) FAD
j) chlorophyll a
k) ferredoxin b
l) resonance energy transfer
The process in which a positive charge forms on one molecule by the loss of a photoexcited electron, and a negative charge forms on another by the gain of an electron is referred to as ________________.

Question 14

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) 960 nm
b) magnesium
c) ATP synthase
d) chloroplasts
e) thylakoids
f) copper
g) β-carotene
h) 680 nm
i) FAD
j) chlorophyll a
k) ferredoxin b
l) resonance energy transfer
Chlorophyll a contains a(n) ____________ ion in the center of the tetrapyrole.

Question 15

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) 960 nm
b) magnesium
c) ATP synthase
d) chloroplasts
e) thylakoids
f) copper
g) β-carotene
h) 680 nm
i) FAD
j) chlorophyll a
k) ferredoxin b
l) resonance energy transfer
________________ is the receptor of excited electrons from P680.

Question 16

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) 960 nm
b) magnesium
c) ATP synthase
d) chloroplasts
e) thylakoids
f) copper
g) β-carotene
h) 680 nm
i) FAD
j) chlorophyll a
k) ferredoxin b
l) resonance energy transfer
Another name for the CF1-CF0 complex is ____________.

Question 17

The manganese center of photosystem II converts ________________ to ________________.

Question 18

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) 960 nm
b) magnesium
c) ATP synthase
d) chloroplasts
e) thylakoids
f) copper
g) β-carotene
h) 680 nm
i) FAD
j) chlorophyll a
k) ferredoxin b
l) resonance energy transfer
One of the accessory pigments in plants is ____________.

Question 19

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) 960 nm
b) magnesium
c) ATP synthase
d) chloroplasts
e) thylakoids
f) copper
g) β-carotene
h) 680 nm
i) FAD
j) chlorophyll a
k) ferredoxin b
l) resonance energy transfer
The inner membrane of a chloroplast surrounds a space called the ________________.

Question 20

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
a) 960 nm
b) magnesium
c) ATP synthase
d) chloroplasts
e) thylakoids
f) copper
g) β-carotene
h) 680 nm
i) FAD
j) chlorophyll a
k) ferredoxin b
l) resonance energy transfer
Photosystem II responds to wavelengths shorter than ____________.

Question 21

Stacked and unstacked regions of the thylakoid are arranged such that:

A) photosystem I is located in the unstacked regions.
B) photosystem II is located in the stacked region.
C) ATP synthase occurs mainly in unstacked retions.
D) A and C.
E) A, B, and C.

Question 22

What are the likely reasons that manganese evolved as the ion used in photosystem II?

Question 23

How is energy transferred from a photoreceptor molecule to photosystem II?

Question 24

Why are chlorophylls good candidates for photoreceptors?

Question 25

Light absorption induces electron transfer from P680 to:

A) pheophytin.
B) QH2.
C) cytochrome c.
D) chlorophyll
E) None of the above.

Question 26

Why, then, is this process critical to our survival?

Question 27

How is light used in photosynthesis?

A) The light is necessary to make the chlorophyll green, so the pigment can transmit electrons.
B) The light is used to generate high-energy electrons with great reducing potential.
C) The light provides heat energy for the chloroplasts.
D) The light is absorbed by oxygen, which is converted into water.
E) None of the above.

Question 28

How is a chloroplast similar to a mitochondria?

Question 29

How many protons are transferred into the thylakoid lumen after four photons have been absorbed by the photosystems?

A) 2
B) 12
C) 18
D) 4
E) 8

Question 30

Write the overall reaction of photosystem II.

Question 31

Write out the reaction for photosynthetic production of carbohydrates and oxygen.

Question 32

Describe the process of cyclic photophosphorylation.

Question 33

Complete the following reaction for photosystem I: Pc(Cu+) + Fdox + light →

A) Pc(Cu+) + Fdox + light → Pc (Cu+) + (Cu+) Fdred
B) Pc(Cu+) + Fdox + light → Pc (Cu2+) + Fdred
C) Pc(Cu+) + Fdox + light → Pc + Fdred(Cu2+)
D) Pc(Cu+) + Fdox + light → Pc- (Cu3+) + Fdred
E) None of the above.

Question 34

How many chloroplasts does a typical plant cell have?

A) 1-100
B) 200-500
C) > 1000
D) 500-800
E) None of the above.

Question 35

Light absorbed by a chlorophyll a causes:

A) an electron to move from the photon to the chlorophyll.
B) an electron to move from a ground state to an excited state.
C) an electron to move to a neighboring water molecule.
D) an electron to move from chlorophyll to ADP.
E) None of the above.

Question 36

The pathway of electron flow from H2O to NADP+ in photosynthesis is referred to as:

A) cooperative special pairs.
B) photorespiration.
C) the Z scheme of photosynthesis.
D) photophosphorylation.
E) None of the above.

Question 37

What is the original source of electrons used to neutralize the special pair in photosystem II?

A) reduced cytochrome bf
B) NADH
C) H2O
D) membrane lipids
E) ferredoxin

Question 38

Which of the following is/are light harvesting molecules?

A) vitamin D
B) carotenoids
C) chlorophyll b
D) plastocyanin
E) B and C

Question 39

The D1 and D2 subunits of photosystem II:

A) span the thylakoid membrane.
B) are similar to each other.
C) are homologous to the L and M chains of the bacterial center.
D) A and C.
E) A, B, and C.

Question 40

In the overall stoichiometry of the light reactions, eight photons of light generate:

A) four NADPH.
B) four NADH.
C) three ATP.
D) B and C.
E) A, B, and C.

Question 41

Describe the path of electrons in photosystem I.

Question 42

How is it possible to make ATP without generating NADPH?

Question 43

Give the overall net equation as catalyzed by the Z scheme of photosynthesis.

Question 44

What is the role of accessory pigments in photosynthesis?

Question 45

How do herbicides such as diuron or atrazine work?

Question 46

Describe the experiment by Jagendorf that helped confirm Mitchell's chemiosmotic hypothesis.