Question 1

Which enzyme in the photosynthetic Z scheme catalyzes the PQ cycle,which is analogous to Complex III and the Q cycle in the mitochondrial electron transport chain?

Accepted Answer

A)  photosystem II 
B)  plastocyanin 
C)  cytochrome b6f 
D)  photosystem I 
A)  photosystem II 
B)  plastocyanin 
C)  cytochrome b6f 
D)  photosystem I C

Question 2

Which statement regarding CAM plants is true?

Accepted Answer

A)  They use one cell type to absorb and store CO2 before utilizing it in the Calvin cycle in another cell type. 
B)  They are more efficient than C4 plants. 
C)  They absorb CO2 at night and release it to the Calvin cycle during the day. 
D)  They store CO2 in 3-phosphoglycerate before releasing it to the Calvin cycle. 
A)  They use one cell type to absorb and store CO2 before utilizing it in the Calvin cycle in another cell type. 
B)  They are more efficient than C4 plants. 
C)  They absorb CO2 at night and release it to the Calvin cycle during the day. 
D)  They store CO2 in 3-phosphoglycerate before releasing it to the Calvin cycle. C

Question 3

Which electron carrier molecule in the photosynthetic electron transport chain is largely hydrophobic and found floating in the thylakoid membrane?

Accepted Answer

A)  heme 
B)  chlorophyll 
C)  pheophytin 
D)  plastoquinone 
A)  heme 
B)  chlorophyll 
C)  pheophytin 
D)  plastoquinone D

Question 4

Which of the following is a photosynthetic light harvesting pigment?

Accepted Answer

A)  FeS cluster 
B)  NADPH 
C)  plastoquinone 
D)  $\beta$-carotene 
A)  FeS cluster 
B)  NADPH 
C)  plastoquinone 
D)  $\beta$-carotene

Question 5

Explain how the bundle sheath and mesophyll cells in C4 plants cooperate to accomplish the delivery of CO2 to the Calvin cycle.

Accepted Answer

In the surface mesophyll cells,CO₂ is abs

Question 6

The formation of one net glyceraldehyde-3-phosphate during the net Calvin cycle reactions requires __________ NADPH and __________ ATP.

Accepted Answer

A)  3; 3 
B)  3; 6 
C)  6; 6 
D)  6; 9 
A)  3; 3 
B)  3; 6 
C)  6; 6 
D)  6; 9

Question 7

To form one O2,__________ electrons must leave two water molecules,and to form one NADPH,__________ electrons must be delivered to one NADP+.

Accepted Answer

A)  2; 2 
B)  2; 4 
C)  4; 2 
D)  4; 4 
A)  2; 2 
B)  2; 4 
C)  4; 2 
D)  4; 4

Question 8

In the chloroplasts,photosystem I (PSI)and photosystem II (PSII)are known to localize in different regions.PSI generally localizes in the __________,whereas PSII localizes in the __________.

Accepted Answer

A)  thylakoid lumen; thylakoid grana 
B)  thylakoid lamellae; thylakoid grana 
C)  stroma; thylakoid lumen 
D)  thylakoid grana; thylakoid lamellae 
A)  thylakoid lumen; thylakoid grana 
B)  thylakoid lamellae; thylakoid grana 
C)  stroma; thylakoid lumen 
D)  thylakoid grana; thylakoid lamellae

Question 9

In the five steps used by photosynthetic organisms to convert solar energy into chemical energy,which molecules store the solar energy before sugar synthesis?

Accepted Answer

A)  chlorophylls 
B)  NADH and FADH2 
C)  H2O and O2 
D)  ATP and NADPH 
A)  chlorophylls 
B)  NADH and FADH2 
C)  H2O and O2 
D)  ATP and NADPH

Question 10

The reactions in stage 2 of the Calvin cycle are the same as those of the gluconeogenesis/glycolysis pathway in the

Accepted Answer

A)  cellular location of the pathways. 
B)  use of NADPH as reductant. 
C)  C3 sugars in the pathways. 
D)  enzyme locations. 
A)  cellular location of the pathways. 
B)  use of NADPH as reductant. 
C)  C3 sugars in the pathways. 
D)  enzyme locations.

Question 11

What is a reason for keeping photosystem I (PSI)and photosystem II (PSII)separate in the chloroplasts?

Accepted Answer

A)  They are involved in different pathways and not involved with each other. 
B)  They would quench each other by energy transfer. 
C)  They have different sunlight exposure requirements. 
D)  They have different ATP consumption requirements. 
A)  They are involved in different pathways and not involved with each other. 
B)  They would quench each other by energy transfer. 
C)  They have different sunlight exposure requirements. 
D)  They have different ATP consumption requirements.

Question 12

List the three possible fates of an electron in an excited state chlorophyll molecule.

Accepted Answer

See Figure 12.9 below.(1)Electron transf

Question 13

Unlike plant cells,animal cells lack the glyoxylate enzymes

Accepted Answer

A)  isocitrate lyase and malate synthase. 
B)  rubisco and transaldolase. 
C)  acetyl-CoA carboxylase and citrate synthase. 
D)  isocitrate dehydrogenase and  -ketoglutarate dehydrogenase. 
A)  isocitrate lyase and malate synthase. 
B)  rubisco and transaldolase. 
C)  acetyl-CoA carboxylase and citrate synthase. 
D)  isocitrate dehydrogenase and  -ketoglutarate dehydrogenase.

Question 14

What is the name of the enzyme that catalyzes the reaction shown below?

Accepted Answer

A)  ribulose bisphosphate carboxylase 
B)  acetyl-CoA carboxylase 
C)  glyceraldehyde-3-phosphate dehydrogenase 
D)  pyruvate carboxylase 
A)  ribulose bisphosphate carboxylase 
B)  acetyl-CoA carboxylase 
C)  glyceraldehyde-3-phosphate dehydrogenase 
D)  pyruvate carboxylase

Question 15

For photosynthesis,sunlight energy drives electron transfer.Where are the electrons ejected from when light is absorbed?

Accepted Answer

A)  photons released by chlorophyll 
B)  NADPH 
C)  light-harvesting pigments in PSI and PSII 
D)  oxygen 
A)  photons released by chlorophyll 
B)  NADPH 
C)  light-harvesting pigments in PSI and PSII 
D)  oxygen

Question 16

In the figure below,identify A and B in the active site of rubisco.

Accepted Answer

A is the active site Mg²⁺ ion.B

Question 17

Under what conditions does cyclic photophosphorylation take place?

Accepted Answer

A)  in an acidic stroma 
B)  with high levels of NADPH 
C)  with high levels of ATP 
D)  with an inactivated photosystem I 
A)  in an acidic stroma 
B)  with high levels of NADPH 
C)  with high levels of ATP 
D)  with an inactivated photosystem I

Question 18

The three stages of the Calvin cycle are

Accepted Answer

A)  (1) fix CO2, (2) make a C3 sugar, and (3) make glucose. 
B)  (1) fix CO2, (2) use NADPH and ATP, and (3) regenerate the starting C5 molecule. 
C)  (1) use ATP, NADPH, and CO2, (2) make a C3 molecule, and (3) regenerate the starting C3 molecule. 
D)  (1) use a C5 sugar, (2) reduce CO2 with NADPH, and (3) use ATP to regenerate the starting C5 molecule. 
A)  (1) fix CO2, (2) make a C3 sugar, and (3) make glucose. 
B)  (1) fix CO2, (2) use NADPH and ATP, and (3) regenerate the starting C5 molecule. 
C)  (1) use ATP, NADPH, and CO2, (2) make a C3 molecule, and (3) regenerate the starting C3 molecule. 
D)  (1) use a C5 sugar, (2) reduce CO2 with NADPH, and (3) use ATP to regenerate the starting C5 molecule.

Question 19

Draw the path of electrons in the cyclic photophosphorylation pathway showing the main enzymes and electron carriers involved and demonstrating its cyclic nature.

Accepted Answer

See Figure 12.38 below.photosy

Question 20

Per O2 molecule generated in photosynthesis light reactions,approximately how many protons are moved across the thylakoid membrane?

Accepted Answer

A)  3 
B)  4 
C)  8 
D)  12 
A)  3 
B)  4 
C)  8 
D)  12

Exam 12: Photosynthesis

Which enzyme in the photosynthetic Z scheme catalyzes the PQ cycle,which is analogous to Complex III and the Q cycle in the mitochondrial electron transport chain?

Which statement regarding CAM plants is true?

Which electron carrier molecule in the photosynthetic electron transport chain is largely hydrophobic and found floating in the thylakoid membrane?

Which of the following is a photosynthetic light harvesting pigment?

Explain how the bundle sheath and mesophyll cells in C4 plants cooperate to accomplish the delivery of CO2 to the Calvin cycle.

The formation of one net glyceraldehyde-3-phosphate during the net Calvin cycle reactions requires __________ NADPH and __________ ATP.

To form one O2,__________ electrons must leave two water molecules,and to form one NADPH,__________ electrons must be delivered to one NADP+.

In the chloroplasts,photosystem I (PSI)and photosystem II (PSII)are known to localize in different regions.PSI generally localizes in the __________,whereas PSII localizes in the __________.

In the five steps used by photosynthetic organisms to convert solar energy into chemical energy,which molecules store the solar energy before sugar synthesis?

The reactions in stage 2 of the Calvin cycle are the same as those of the gluconeogenesis/glycolysis pathway in the

What is a reason for keeping photosystem I (PSI)and photosystem II (PSII)separate in the chloroplasts?

List the three possible fates of an electron in an excited state chlorophyll molecule.

Unlike plant cells,animal cells lack the glyoxylate enzymes

What is the name of the enzyme that catalyzes the reaction shown below?

For photosynthesis,sunlight energy drives electron transfer.Where are the electrons ejected from when light is absorbed?

In the figure below,identify A and B in the active site of rubisco.

Under what conditions does cyclic photophosphorylation take place?

The three stages of the Calvin cycle are

Draw the path of electrons in the cyclic photophosphorylation pathway showing the main enzymes and electron carriers involved and demonstrating its cyclic nature.

Per O2 molecule generated in photosynthesis light reactions,approximately how many protons are moved across the thylakoid membrane?

Principles of Biochemistry

Physical Biochemistry: Energy Conversion,water,and Membranes

Nucleic Acid Structure and Function

Protein Structure

Methods in Protein Biochemistry

Protein Function

Enzyme Mechanisms

Cell Signaling Systems

Glycolysis: a Paradigm of Metabolic Regulation

The Citrate Cycle

Oxidative Phosphorylation

Carbohydrate Structure and Function

Carbohydrate Metabolism

Lipid Structure and Function

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Metabolic Integration

Dna Replication, repair, and Recombination

Rna Synthesis, processing, and Gene Silencing

Protein Synthesis, posttranslational Modification, and Transport

Gene Regulation

Filters

Explain how the bundle sheath and mesophyll cells in C₄ plants cooperate to accomplish the delivery of CO₂ to the Calvin cycle.

The formation of one net glyceraldehyde-3-phosphate during the net Calvin cycle reactions requires NADPH and ATP.

To form one O₂, electrons must leave two water molecules,and to form one NADPH, electrons must be delivered to one NADP⁺.

In the chloroplasts,photosystem I (PSI)and photosystem II (PSII)are known to localize in different regions.PSI generally localizes in the ,whereas PSII localizes in the .

Per O₂ molecule generated in photosynthesis light reactions,approximately how many protons are moved across the thylakoid membrane?