Question 1

During Z-scheme photosynthesis,ferredoxin oxidizes NADPH.

Accepted Answer

A) True 
 B)False

Question 2

The transfer of electrons from water to NADP+ to produce oxygen and NADPH is a highly exergonic process.

Accepted Answer

A) True 
 B)False

Question 3

The first CO2 fixing reaction of the Hatch-Slack pathway is:

Accepted Answer

A)  Conversion of phosphoenolpyruvate and CO2 to oxaloacetate. 
B)  Conversion of succinate and CO2 to a-ketoglutarate. 
C)  Conversion of acetate and CO2 to pyruvate. 
D)  Conversion of acetate and CO2 to malonate. 
E)  More than one of these reactions can initiate the Hatch-Slack Pathway. 
A)  Conversion of phosphoenolpyruvate and CO2 to oxaloacetate. 
B)  Conversion of succinate and CO2 to a-ketoglutarate. 
C)  Conversion of acetate and CO2 to pyruvate. 
D)  Conversion of acetate and CO2 to malonate. 
E)  More than one of these reactions can initiate the Hatch-Slack Pathway.

Question 4

It is believed that the ratio of cyclic electron transport to Z-scheme photosynthesis changes in response to metabolic demands.If a plant were actively engaged in a large amount of reductive biosynthesis,requiring NADPH,how would it alter these processes compared to a plant just performing the Calvin cycle to produce glucose?

Accepted Answer

A)  More cyclic photophosphorylation, less Z-scheme. 
B)  More Z-scheme photosynthesis, less cyclic photophosphorylation. 
C)  No significant difference. 
D)  Impossible to predict from the information provided. 
A)  More cyclic photophosphorylation, less Z-scheme. 
B)  More Z-scheme photosynthesis, less cyclic photophosphorylation. 
C)  No significant difference. 
D)  Impossible to predict from the information provided.

Question 5

The reactions during the light phase of photosynthesis include the following:   The order of the reactions is as follows:

Accepted Answer

A)  4 2 3 1 5. 
B)  3 2 5 1 4. 
C)  3 1 5 2 4. 
D)  4 1 5 2 3. 
E)  5 2 4 1 3. 
A)  4 2 3 1 5. 
B)  3 2 5 1 4. 
C)  3 1 5 2 4. 
D)  4 1 5 2 3. 
E)  5 2 4 1 3.

Question 6

The oxygen evolving complex consists of

Accepted Answer

A)  accessory pigments. 
B)  a manganese-containing protein. 
C)  the reaction center chlorophylls. 
D)  ferredoxin. 
A)  accessory pigments. 
B)  a manganese-containing protein. 
C)  the reaction center chlorophylls. 
D)  ferredoxin.

Question 7

The actual CO2 fixation process in photosynthesis is the addition of CO2 into a 5 carbon compound to yield

Accepted Answer

A)  ribulose 5-phosphate. 
B)  ribulose 1,5-bisphosphate. 
C)  erythrose 4-phosphate. 
D)  3-phosphoglycerate. 
A)  ribulose 5-phosphate. 
B)  ribulose 1,5-bisphosphate. 
C)  erythrose 4-phosphate. 
D)  3-phosphoglycerate.

Question 8

Chlorophyll differs from heme because it

Accepted Answer

A)  has a cyclohexene ring fused to the tetrapyrrole ring system. 
B)  has a 16-carbon unbranched side chain. 
C)  contains magnesium rather than iron. 
D)  has a fully saturated tetrapyrrole ring. 
A)  has a cyclohexene ring fused to the tetrapyrrole ring system. 
B)  has a 16-carbon unbranched side chain. 
C)  contains magnesium rather than iron. 
D)  has a fully saturated tetrapyrrole ring.

Question 9

Light with short wavelengths has less energy than light with long wavelengths.

Accepted Answer

A) True 
 B)False

Question 10

The enzyme ribulose 1,5-bisphosphate carboxylase

Accepted Answer

A)  consists of eight catalytic subunits encoded by a chloroplast and eight regulatory subunits encoded by a nuclear gene. 
B)  is difficult to isolate and study because it occurs in small amount in plant cells. 
C)  is nonallosteric. 
D)  is not involved in reactions linked to oxygen. 
A)  consists of eight catalytic subunits encoded by a chloroplast and eight regulatory subunits encoded by a nuclear gene. 
B)  is difficult to isolate and study because it occurs in small amount in plant cells. 
C)  is nonallosteric. 
D)  is not involved in reactions linked to oxygen.

Question 11

The earliest photosynthetic organisms most likely used water as an electron source.

Accepted Answer

A) True 
 B)False

Question 12

For the net synthesis of one six-carbon sugar from CO2 in photosynthesis there is a requirement for

Accepted Answer

A)  12 ATP and 12 NADPH. 
B)  18 ATP and 18 NADPH. 
C)  12 ATP and 18 NADPH. 
D)  18 ATP and 12 NADPH. 
A)  12 ATP and 12 NADPH. 
B)  18 ATP and 18 NADPH. 
C)  12 ATP and 18 NADPH. 
D)  18 ATP and 12 NADPH.

Question 13

Which of the following is not true regarding the C4 pathway?

Accepted Answer

A)  The C4 pathway allows for the concentration of CO2 
B)  the KM for CO2 is lower with Rubisco than for phosphoenolpyruvate carboxylase 
C)  Rubisco also has an oxygenase activity that appears to be a wasteful process in terms of energy production 
D)  The C4 pathway alleviates some of the wastefulness of the oxygenase activity of Rubisco by concentrating CO2 in the interior of the plant. 
A)  The C4 pathway allows for the concentration of CO2 
B)  the KM for CO2 is lower with Rubisco than for phosphoenolpyruvate carboxylase 
C)  Rubisco also has an oxygenase activity that appears to be a wasteful process in terms of energy production 
D)  The C4 pathway alleviates some of the wastefulness of the oxygenase activity of Rubisco by concentrating CO2 in the interior of the plant.

Question 14

During cyclic electron transport

Accepted Answer

A)  only Photosystem II is involved. 
B)  only Photosystem I is involved. 
C)  both photosystems are involved. 
D)  neither photosystem is involved. 
A)  only Photosystem II is involved. 
B)  only Photosystem I is involved. 
C)  both photosystems are involved. 
D)  neither photosystem is involved.

During Z-scheme photosynthesis,ferredoxin oxidizes NADPH.

The transfer of electrons from water to NADP⁺ to produce oxygen and NADPH is a highly exergonic process.

The first CO₂ fixing reaction of the Hatch-Slack pathway is:

The reactions during the light phase of photosynthesis include the following: The order of the reactions is as follows:

The oxygen evolving complex consists of

The actual CO₂ fixation process in photosynthesis is the addition of CO₂ into a 5 carbon compound to yield

Chlorophyll differs from heme because it

Light with short wavelengths has less energy than light with long wavelengths.

The enzyme ribulose 1,5-bisphosphate carboxylase

The earliest photosynthetic organisms most likely used water as an electron source.

For the net synthesis of one six-carbon sugar from CO₂ in photosynthesis there is a requirement for

Which of the following is not true regarding the C₄ pathway?

During cyclic electron transport

Biochemistry and the Organization of Cells

Water: The Solvent for Biochemical Reactions

Amino Acids and Peptides

The Three-Dimensional Structure of Proteins

Protein Purification and Characterization Techniques

The Behavior of Proteins: Enzymes

The Behavior of Proteins: Enzymes, Mechanisms, and Control

Lipids and Proteins Are Associated in Biological Membranes

Nucleic Acids: How Structure Conveys Information

Biosynthesis of Nucleic Acids: Replication

Transcription of the Genetic Code: Biosynthesis of Rna

Protein Synthesis: Translation of the Genetic Message

Nucleic Acid Biotechnology Techniques

Viruses, Cancer, and Immunology

The Importance of Energy Changes and Electron Transfer in Metabolism

Carbohydrates

Glycolysis

Storage Mechanisms and Control in Carbohydrate Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Lipid Metabolism

The Metabolism of Nitrogen

Integration of Metabolism: Cellular Signaling

Filters

Exam 22: Photosynthesis

During Z-scheme photosynthesis,ferredoxin oxidizes NADPH.

The transfer of electrons from water to NADP+ to produce oxygen and NADPH is a highly exergonic process.

The first CO2 fixing reaction of the Hatch-Slack pathway is:

The reactions during the light phase of photosynthesis include the following: The order of the reactions is as follows:

The oxygen evolving complex consists of

The actual CO2 fixation process in photosynthesis is the addition of CO2 into a 5 carbon compound to yield

Chlorophyll differs from heme because it

Light with short wavelengths has less energy than light with long wavelengths.

The enzyme ribulose 1,5-bisphosphate carboxylase

The earliest photosynthetic organisms most likely used water as an electron source.

For the net synthesis of one six-carbon sugar from CO2 in photosynthesis there is a requirement for

Which of the following is not true regarding the C4 pathway?

During cyclic electron transport

Biochemistry and the Organization of Cells

Water: The Solvent for Biochemical Reactions

Amino Acids and Peptides

The Three-Dimensional Structure of Proteins

Protein Purification and Characterization Techniques

The Behavior of Proteins: Enzymes

The Behavior of Proteins: Enzymes, Mechanisms, and Control

Lipids and Proteins Are Associated in Biological Membranes

Nucleic Acids: How Structure Conveys Information

Biosynthesis of Nucleic Acids: Replication

Transcription of the Genetic Code: Biosynthesis of Rna

Protein Synthesis: Translation of the Genetic Message

Nucleic Acid Biotechnology Techniques

Viruses, Cancer, and Immunology

The Importance of Energy Changes and Electron Transfer in Metabolism

Carbohydrates

Glycolysis

Storage Mechanisms and Control in Carbohydrate Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Lipid Metabolism

The Metabolism of Nitrogen

Integration of Metabolism: Cellular Signaling

Filters

The transfer of electrons from water to NADP⁺ to produce oxygen and NADPH is a highly exergonic process.

The first CO₂ fixing reaction of the Hatch-Slack pathway is:

The actual CO₂ fixation process in photosynthesis is the addition of CO₂ into a 5 carbon compound to yield

For the net synthesis of one six-carbon sugar from CO₂ in photosynthesis there is a requirement for

Which of the following is not true regarding the C₄ pathway?