Question 1

Light absorbed by a chlorophyll a causes an electron to move

Accepted Answer

A)  from the photon to the chlorophyll. 
B)  from ground state to an excited state. 
C)  to a neighboring water molecule. 
D)  from chlorophyll to ADP. 
E)  None of the answers is correct. 
A)  from the photon to the chlorophyll. 
B)  from ground state to an excited state. 
C)  to a neighboring water molecule. 
D)  from chlorophyll to ADP. 
E)  None of the answers is correct. B

Question 2

Describe the arrangement of the photosynthetic assemblies in the thylakoid membranes.

Accepted Answer

Photosystem I and ATP synthase are located almost exclusively in unstacked regions whereas photosystem II is present mostly in stacked regions.

Question 3

The process in which a positive charge forms on one molecule by the loss of a electron which has been excited by light, and a negative charge forms on another by the gain of an electron is referred to as _____________________________________.

Accepted Answer

photoinduced charge separation

Question 4

How is charge recombination of BPh -  and P960+ suppressed in bacterial photosynthesis?

Accepted Answer

Several factors are key. First, another

Question 5

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

Accepted Answer

Manganese can exist in multipl

Question 6

The manganese center of photosystem II converts _________ to __________.

Accepted Answer

The answer of The manganese center of photosystem II converts...

Question 7

Bacterial reaction centers are analogous to

Accepted Answer

A)  photosystem I. 
B)  photosystem II. 
C)  succinate dehydrogenase. 
D)  photosystem I and photosystem II. 
E)  All of the answers are correct. 
A)  photosystem I. 
B)  photosystem II. 
C)  succinate dehydrogenase. 
D)  photosystem I and photosystem II. 
E)  All of the answers are correct.

Question 8

Write the overall reaction of photosystem II.

Accepted Answer

2 Q + 2 H₂O + light

Question 9

The D1 and D2 subunits of photosystem II

Accepted Answer

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)  are similar to each other and are homologous to the L and M chains of the bacterial center. 
E)  All the answers are correct. 
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)  are similar to each other and are homologous to the L and M chains of the bacterial center. 
E)  All the answers are correct.

Question 10

What is the role of accessory pigments in photosynthesis?

Accepted Answer

Chlorophyll a only absorbs visible light

Question 11

Photosystem II responds to wavelengths of light shorter than _____ nm.

Accepted Answer

A)  450 
B)  520 
C)  580 
D)  650 
E)  680 
A)  450 
B)  520 
C)  580 
D)  650 
E)  680

Question 12

How is light used in photosynthesis?

Accepted Answer

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 answers is correct. 
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 answers is correct.

Question 13

Which of the following is an accessory pigment found in plants?

Accepted Answer

A)  plastocyanin 
B)  $\beta$-carotene 
C)  chlorophyll a 
D)  cytochrome b 
E)  None of the answers is correct. 
A)  plastocyanin 
B)  $\beta$-carotene 
C)  chlorophyll a 
D)  cytochrome b 
E)  None of the answers is correct.

Question 14

Which of the following, when in the correct protein environment, is a very strong oxidant capable of extracting electrons from water?

Accepted Answer

A)  calcium 
B)  copper 
C)  manganese 
D)  magnesium 
E)  iron 
A)  calcium 
B)  copper 
C)  manganese 
D)  magnesium 
E)  iron

Question 15

Light absorption induces electron transfer from P680 to

Accepted Answer

A)  pheophytin. 
B)  Q. 
C)  cytochrome c. 
D)  chlorophyll a. 
E)  None of the answers is correct. 
A)  pheophytin. 
B)  Q. 
C)  cytochrome c. 
D)  chlorophyll a. 
E)  None of the answers is correct.

Question 16

What is the principal photoreceptor in chloroplasts of green plants?

Accepted Answer

A) $\beta$-carotene 
B)  chlorophyll a 
C)  chlorophyll b 
D)  pheophytin 
E)  phycocyanin 
A) $\beta$-carotene 
B)  chlorophyll a 
C)  chlorophyll b 
D)  pheophytin 
E)  phycocyanin

Question 17

How do herbicides such as diuron or atrazine work?

Accepted Answer

These inhibitors block electro

Question 18

How is a chloroplast similar to a mitochondria?

Accepted Answer

Both are sites for ATP synthesis. Both h

Question 19

Describe the path of electrons in photosystem I. Provide a diagram if necessary.

Accepted Answer

The electrons transfer from P7

Question 20

Why are chlorophylls good candidates for photoreceptors?

Accepted Answer

The conjugated network of sing

Exam 19: The Light Reactions of Photosynthesis

Light absorbed by a chlorophyll a causes an electron to move

Describe the arrangement of the photosynthetic assemblies in the thylakoid membranes.

The process in which a positive charge forms on one molecule by the loss of a electron which has been excited by light, and a negative charge forms on another by the gain of an electron is referred to as _____________________________________.

How is charge recombination of BPh - and P960+ suppressed in bacterial photosynthesis?

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

The manganese center of photosystem II converts _________ to __________.

Bacterial reaction centers are analogous to

Write the overall reaction of photosystem II.

The D1 and D2 subunits of photosystem II

What is the role of accessory pigments in photosynthesis?

Photosystem II responds to wavelengths of light shorter than _____ nm.

How is light used in photosynthesis?

Which of the following is an accessory pigment found in plants?

Which of the following, when in the correct protein environment, is a very strong oxidant capable of extracting electrons from water?

Light absorption induces electron transfer from P680 to

What is the principal photoreceptor in chloroplasts of green plants?

How do herbicides such as diuron or atrazine work?

How is a chloroplast similar to a mitochondria?

Describe the path of electrons in photosystem I. Provide a diagram if necessary.

Why are chlorophylls good candidates for photoreceptors?

Biochemistry: an Evolving Science

Protein Composition and Structure

Exploring Proteins and Proteomes

DNA, RNA, and the Flow of Genetic Information

Exploring Genes and Genomes

Exploring Evolution and Bioinformatics

Hemoglobin: a Portrait of a Protein in Action

Enzymes: Basic Concepts and Kinetics

Oxidative Phosphorylation

Catalytic Strategies

Regulatory Strategies

Carbohydrates

Lipids and Cell Membranes

Membrane Channels and Pumps

Signal-Transduction Pathways

Metabolism: Basic Concepts and Design

Glycolysis and Gluconeogenesis

The Citric Acid Cycle

The Calvin Cycle and the Pentose Phosphate Pathway

Glycogen Metabolism

Fatty Acid Metabolism

Protein Turnover and Amino Acid Catabolism

The Biosynthesis of Amino Acids

Nucleotide Biosynthesis

Biosynthesis of Membrane Lipids and Steroids

The Integration of Metabolism

DNA Replication, Repair, and Recombination

Rna Synthesis and Processing

Protein Synthesis

The Control of Gene Expression in Prokaryotes

The Control of Gene Expression in Eukaryotes

Sensory Systems

The Immune System

Molecular Motors

Drug Development

Filters

How is charge recombination of BPh ^- and P960⁺ suppressed in bacterial photosynthesis?

The manganese center of photosystem II converts _ to __.