Question 1

The initial carbon dioxide acceptor of the C4 pathway is .

Accepted Answer

A)  phosphoenolpyruvate 
B)  oxaloacetate 
C)  ribulose 1,5-bisphosphate 
D)  PEP carboxylase 
A)  phosphoenolpyruvate 
B)  oxaloacetate 
C)  ribulose 1,5-bisphosphate 
D)  PEP carboxylase

Question 2

The light-dependent reactions are located in the thylakoid membrane of chloroplasts, while the dark reactions are located within the lumen.

Accepted Answer

A) True 
 B)False

Question 3

Which statement is false about the photosynthesis in plants?

Accepted Answer

A)  PSII is not directly exposed to the stroma. 
B)  PSI produces ferredoxin. 
C)  ATP is synthesized in the lumen. 
D)  PQH2 can diffuse within the thylakoid membrane. 
A)  PSII is not directly exposed to the stroma. 
B)  PSI produces ferredoxin. 
C)  ATP is synthesized in the lumen. 
D)  PQH2 can diffuse within the thylakoid membrane.

Question 4

Which is the correct order for the stages of the Calvin cycle?

Accepted Answer

A)  Carboxylation → Reduction → Regeneration 
B)  Regeneration → Carboxylation → Reduction 
C)  Carboxylation → Regeneration → Reduction 
D)  Reduction → Carboxylation → Regeneration 
A)  Carboxylation → Reduction → Regeneration 
B)  Regeneration → Carboxylation → Reduction 
C)  Carboxylation → Regeneration → Reduction 
D)  Reduction → Carboxylation → Regeneration

Question 5

In plants the light-harvesting complex LHC(II) completely surrounds PSII.

Accepted Answer

A) True 
 B)False

Question 6

What is the main advantage for plants that use the C4 pathway in addition to the Calvin cycle for the fixation of carbon dioxide?

Accepted Answer

A)  Fewer ATP are consumed to produce carbohydrates using the C4 pathway as opposed to the Calvin cycle. 
B)  The C4 pathway allows for fixation of carbon dioxide at night. 
C)  The C4 pathway aids in the avoidance of the oxygenation of ribulose 1,5-bisphosphate. 
D)  The C4 cycle allows photosynthesis to occur at a wide range of wavelengths of light. 
A)  Fewer ATP are consumed to produce carbohydrates using the C4 pathway as opposed to the Calvin cycle. 
B)  The C4 pathway allows for fixation of carbon dioxide at night. 
C)  The C4 pathway aids in the avoidance of the oxygenation of ribulose 1,5-bisphosphate. 
D)  The C4 cycle allows photosynthesis to occur at a wide range of wavelengths of light.

Question 7

Plant pigments which can absorb light include

Accepted Answer

A)  chlorophyll a. 
B)  chlorophyll b. 
C)  carotenoids and phycobilins. 
D)  All of the above 
E)  A and B only 
A)  chlorophyll a. 
B)  chlorophyll b. 
C)  carotenoids and phycobilins. 
D)  All of the above 
E)  A and B only

Question 8

In Crassulacean Acid Metabolism CAM) acetate accumulated at night supplies CO2 for carbon assimilation during the day.

Accepted Answer

A) True 
 B)False

Question 9

The initial reactions of the C4 pathway occur in the .

Accepted Answer

A)  chloroplast stroma 
B)  mesophyll cells 
C)  bundle sheath cell cytosol 
D)  stomata plasma membrane 
A)  chloroplast stroma 
B)  mesophyll cells 
C)  bundle sheath cell cytosol 
D)  stomata plasma membrane

Question 10

Vitamin K is part of the electron chain in photosystem II.

Accepted Answer

A) True 
 B)False

Question 11

The CAM pathway and the Calvin cycle generally occur simultaneously in plants during the daytime.

Accepted Answer

A) True 
 B)False

Question 12

Photorespiration in plants involves the .

Accepted Answer

A)  fixation of carbon dioxide to a four-carbon acid 
B)  light-dependent uptake of O2 catalyzed by rubisco, followed by the release of CO2 
C)  reduction of surface-exposed disulfides in the regulation of rubisco 
D)  exclusive fixation of carbon dioxide at night by plants such as cacti 
A)  fixation of carbon dioxide to a four-carbon acid 
B)  light-dependent uptake of O2 catalyzed by rubisco, followed by the release of CO2 
C)  reduction of surface-exposed disulfides in the regulation of rubisco 
D)  exclusive fixation of carbon dioxide at night by plants such as cacti

Question 13

The production of O2 from water supplies an electron first for

Accepted Answer

A)  photosystem I. 
B)  photosystem II. 
C)  cytochrome bf complex. 
D)  plastocyanin. 
A)  photosystem I. 
B)  photosystem II. 
C)  cytochrome bf complex. 
D)  plastocyanin.

Question 14

Attempts to genetically modify rubisco to help increase food production might include trying to .

Accepted Answer

A)  enhance the carboxylation reaction and suppress the oxygenation reaction 
B)  suppress the carboxylation reaction and enhance the oxygenation reaction 
C)  decrease the value of kcat by site-directed mutagenesis 
D)  increase rubiscoʹs activity in the dark 
A)  enhance the carboxylation reaction and suppress the oxygenation reaction 
B)  suppress the carboxylation reaction and enhance the oxygenation reaction 
C)  decrease the value of kcat by site-directed mutagenesis 
D)  increase rubiscoʹs activity in the dark

Question 15

The nocturnal fixation of carbon dioxide in cacti helps .

Accepted Answer

A)  stimulate photorespiration 
B)  minimize use of ATP 
C)  minimize water loss 
D)  transport CO2 to the bundle sheath cells 
A)  stimulate photorespiration 
B)  minimize use of ATP 
C)  minimize water loss 
D)  transport CO2 to the bundle sheath cells

Question 16

Which is the proper order of substrates in the synthesis of starch?

Accepted Answer

A)  glucose 1-phosphate → glucose 6-phosphate → ADP-glucose → starch 
B)  glucose 1-phosphate → fructose 6-phosphate → UDP-fructose → starch 
C)  glucose 3-phosphate → glucose 1-phosphate → ADP-glucose → starch 
D)  glucose 6-phosphate → glucose 1-phosphate → ADP-glucose → starch 
A)  glucose 1-phosphate → glucose 6-phosphate → ADP-glucose → starch 
B)  glucose 1-phosphate → fructose 6-phosphate → UDP-fructose → starch 
C)  glucose 3-phosphate → glucose 1-phosphate → ADP-glucose → starch 
D)  glucose 6-phosphate → glucose 1-phosphate → ADP-glucose → starch

Question 17

Which is not required to activate rubisco?

Accepted Answer

A)  CO2 
B)  Mg2+ 
C)  light 
D)  NADP+ 
E)  All of the above are required 
A)  CO2 
B)  Mg2+ 
C)  light 
D)  NADP+ 
E)  All of the above are required

Question 18

The Calvin cycle occurs in the of plant chloroplasts and in the of bacteria.

Accepted Answer

A)  lumen; plasma membrane 
B)  stroma; cytosol 
C)  granal lamellae; cytosol 
D)  stroma; plasma membrane 
E)  lumen; cytosol 
A)  lumen; plasma membrane 
B)  stroma; cytosol 
C)  granal lamellae; cytosol 
D)  stroma; plasma membrane 
E)  lumen; cytosol

Question 19

Carotenoids, phycobilins, xanthophylls and chlorophyll molecules that are not in the special pair) .

Accepted Answer

A)  can transfer light energy to chlorophylls 
B)  can absorb light energy 
C)  may prevent the formation of reactive superoxide anion 
D)  A, B and C 
E)  A and B only 
A)  can transfer light energy to chlorophylls 
B)  can absorb light energy 
C)  may prevent the formation of reactive superoxide anion 
D)  A, B and C 
E)  A and B only

Question 20

The photosynthetic dark reactions .

Accepted Answer

A)  occur only in the dark nocturnal) 
B)  are the main source of ATP in photosynthesis 
C)  convert carbon dioxide to carbohydrates 
D)  produce the reduced coenzyme NADH 
A)  occur only in the dark nocturnal) 
B)  are the main source of ATP in photosynthesis 
C)  convert carbon dioxide to carbohydrates 
D)  produce the reduced coenzyme NADH

Exam 15: Photosynthesis

The initial carbon dioxide acceptor of the C4 pathway is .

The light-dependent reactions are located in the thylakoid membrane of chloroplasts, while the dark reactions are located within the lumen.

Which statement is false about the photosynthesis in plants?

Which is the correct order for the stages of the Calvin cycle?

In plants the light-harvesting complex LHC(II) completely surrounds PSII.

What is the main advantage for plants that use the C4 pathway in addition to the Calvin cycle for the fixation of carbon dioxide?

Plant pigments which can absorb light include

In Crassulacean Acid Metabolism CAM) acetate accumulated at night supplies CO2 for carbon assimilation during the day.

The initial reactions of the C4 pathway occur in the .

Vitamin K is part of the electron chain in photosystem II.

The CAM pathway and the Calvin cycle generally occur simultaneously in plants during the daytime.

Photorespiration in plants involves the .

The production of O2 from water supplies an electron first for

Attempts to genetically modify rubisco to help increase food production might include trying to .

The nocturnal fixation of carbon dioxide in cacti helps .

Which is the proper order of substrates in the synthesis of starch?

Which is not required to activate rubisco?

The Calvin cycle occurs in the of plant chloroplasts and in the of bacteria.

Carotenoids, phycobilins, xanthophylls and chlorophyll molecules that are not in the special pair) .

The photosynthetic dark reactions .

Introduction to Biochemistry

Water

Amino Acids and the Primary Structures of Proteins

Proteins: Three-Dimensional Structure and Function

Properties of Enzymes

Mechanisms of Enzymes

Coenzymes and Vitamins

Carbohydrates

Lipids and Membranes

Introduction to Metabolism

Glycolysis

Gluconeogenesis, the Pentose Phosphate Pathway, and Glycogen Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Nucleic Acids

Dna Replication, Repair, and Recombination

Transcription and Rna Processing

Protein Synthesis

Recombinant Dna Technology

Filters

The initial carbon dioxide acceptor of the C₄pathway is .

What is the main advantage for plants that use the C₄pathway in addition to the Calvin cycle for the fixation of carbon dioxide?

In Crassulacean Acid Metabolism CAM) acetate accumulated at night supplies CO₂for carbon assimilation during the day.

The initial reactions of the C₄pathway occur in the .

The production of O₂from water supplies an electron first for