Question 1

The essential enzyme for the C4 pathway is

Accepted Answer

A)  ribulose bisphosphate carboxylase:oxygenase 
B)  phosphoenolpyruvate carboxylase 
C)  ferredoxin-thioredoxin reductase 
D)  glyoxylate oxygenase 
A)  ribulose bisphosphate carboxylase:oxygenase 
B)  phosphoenolpyruvate carboxylase 
C)  ferredoxin-thioredoxin reductase 
D)  glyoxylate oxygenase

Question 2

After the reaction with Rubisco,the major difference between the Calvin Cycle and gluconeogenesis in liver is the following reaction:

Accepted Answer

A)  The reduction of 1,3 bisphosphoglyceric acid uses NADPH instead of NADH 
B)  The formation of 1,3 bisphosphoglyceric acid from 3-phosphoglyceric acid uses GTP instead of ATP. 
C)  Phosphatases are not required in plants. 
D)  The reduction of 1,3 bisphosphoglyceric acid uses NADH instead of NADPH 
E)  More than one of these reactions is substantially different in plants compared to liver. 
A)  The reduction of 1,3 bisphosphoglyceric acid uses NADPH instead of NADH 
B)  The formation of 1,3 bisphosphoglyceric acid from 3-phosphoglyceric acid uses GTP instead of ATP. 
C)  Phosphatases are not required in plants. 
D)  The reduction of 1,3 bisphosphoglyceric acid uses NADH instead of NADPH 
E)  More than one of these reactions is substantially different in plants compared to liver.

Question 3

Wavelengths of what color are mostly responsible for the reactions in the light phase of photosynthesis?

Accepted Answer

A)  Blue. 
B)  Green. 
C)  Red 
D)  Blue and red. 
E)  All three colors. 
A)  Blue. 
B)  Green. 
C)  Red 
D)  Blue and red. 
E)  All three colors.

Question 4

Which of the following is true?

Accepted Answer

A)  A protein with a manganese ion is key to the conversion of O2 to water 
B)  The electron transport chain in photosynthesis is identical to the one in mitochondria 
C)  Parts of the electron transport chain in photosynthesis are similar to the electron transport chain in mitochondria 
D)  Photosynthesis is the exact opposite of respiration 
A)  A protein with a manganese ion is key to the conversion of O2 to water 
B)  The electron transport chain in photosynthesis is identical to the one in mitochondria 
C)  Parts of the electron transport chain in photosynthesis are similar to the electron transport chain in mitochondria 
D)  Photosynthesis is the exact opposite of respiration

Question 5

The synthesis of ATP in chloroplasts uses a proton gradient similar to the one used in mitochondria.

Accepted Answer

A) True 
 B)False

Question 6

After the CO2 fixation step in photosynthesis the production of sugars takes place

Accepted Answer

A)  as a reversal of glycolysis. 
B)  as a reversal of the citric acid cycle. 
C)  in the same manner as gluconeogenesis. 
D)  as a reversal of the pentose phosphate pathway. 
A)  as a reversal of glycolysis. 
B)  as a reversal of the citric acid cycle. 
C)  in the same manner as gluconeogenesis. 
D)  as a reversal of the pentose phosphate pathway.

Question 7

The light reactions drive the redox process that involves the following pairs of reactants/products

Accepted Answer

A)  H2O/O2 and NADP+/NADPH 
B)  H2O/O2 and NADH/NAD+ 
C)  O2/H2O and NADPH/NADP+ 
D)  H2O/O2 and FAD/FADH2 
A)  H2O/O2 and NADP+/NADPH 
B)  H2O/O2 and NADH/NAD+ 
C)  O2/H2O and NADPH/NADP+ 
D)  H2O/O2 and FAD/FADH2

Question 8

In which part of the chloroplast does production of oxygen during photosynthesis primarily occur?

Accepted Answer

A)  Grana. 
B)  Thylakoid disks. 
C)  Stroma. 
D)  Thylakoid space. 
E)  It is not known where this reaction occurs in the chloroplast. 
A)  Grana. 
B)  Thylakoid disks. 
C)  Stroma. 
D)  Thylakoid space. 
E)  It is not known where this reaction occurs in the chloroplast.

Question 9

The enzyme,ribulose 1,5 bisphosphate carboxylase (Rubisco),is:

Accepted Answer

A)  one of the most abundant proteins in nature. 
B)  about 15% of the protein content of the chloroplast 
C)  a multisubunit enzyme 
D)  consistent with the endosymbiotic origin for organelles such as chloroplasts and mitochondria 
E)  all of these 
A)  one of the most abundant proteins in nature. 
B)  about 15% of the protein content of the chloroplast 
C)  a multisubunit enzyme 
D)  consistent with the endosymbiotic origin for organelles such as chloroplasts and mitochondria 
E)  all of these

Question 10

The dark phase of photosynthesis is closest to this other metabolic process:

Accepted Answer

A)  Anaerobic Glycolysis. 
B)  The Pentose Phosphate Pathway. 
C)  The Kreb's Cycle. 
D)  The Electron Transport System 
E)  The reactions in the dark phase are not similar to any other pathway. 
A)  Anaerobic Glycolysis. 
B)  The Pentose Phosphate Pathway. 
C)  The Kreb's Cycle. 
D)  The Electron Transport System 
E)  The reactions in the dark phase are not similar to any other pathway.

Question 11

While actively engaging in photosynthesis under illumination,

Accepted Answer

A)  the pH of the thylakoid space would be lower than that of the stroma. 
B)  the pH of the thylakoid space would be greater than that of the stroma. 
C)  the pH of the thylakoid space and of the stroma would be about the same. 
D)  it would be impossible to predict the relative pH's of the thylakoid space and of the stroma. 
A)  the pH of the thylakoid space would be lower than that of the stroma. 
B)  the pH of the thylakoid space would be greater than that of the stroma. 
C)  the pH of the thylakoid space and of the stroma would be about the same. 
D)  it would be impossible to predict the relative pH's of the thylakoid space and of the stroma.

Question 12

The production of ATP in photosynthesis

Accepted Answer

A)  is not linked to a proton gradient across a membrane 
B)  does not involve membrane-bound proteins 
C)  does not require the presence of light 
D)  provides the energy for production of sugars 
A)  is not linked to a proton gradient across a membrane 
B)  does not involve membrane-bound proteins 
C)  does not require the presence of light 
D)  provides the energy for production of sugars

Question 13

After the formation of 3-phosphoglyceric acid,the reactions in the dark phase of photosynthesis are essentially the same as those in gluconeogenesis.

Accepted Answer

A) True 
 B)False

Question 14

It is believed that the ratio of cyclic electron transport to Z-scheme photosynthesis changes in response to metabolic demands.If a plant were using the C4 Hatch-Slack pathway,how would it alter these processes compared to a plant just performing the standard C3 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 15

The Hatch-Slack Pathway is important in tropical zones since,in order to conserve water,the pores of tropical leaves are very small.

Accepted Answer

A) True 
 B)False

Question 16

Of the two photosynthetic pathways,Calvin Cycle or Hatch-Slack Pathway,only the Calvin Cycle uses the pentose phosphate pathway.

Accepted Answer

A) True 
 B)False

Question 17

The nuclear gene for Rubisco codes for the catalytic subunit,while the regulatory gene is found in the chloroplast.

Accepted Answer

A) True 
 B)False

Question 18

In the Calvin cycle a reshuffling of intermediates is necessary

Accepted Answer

A)  to ensure uniform incorporation of CO2 into newly synthesized sugars 
B)  to regenerate the key intermediate with which CO2 initially reacts 
C)  to use as little ATP as possible 
D)  to use as little NADPH as possible 
A)  to ensure uniform incorporation of CO2 into newly synthesized sugars 
B)  to regenerate the key intermediate with which CO2 initially reacts 
C)  to use as little ATP as possible 
D)  to use as little NADPH as possible

Question 19

Which of the following statements concerning the light reactions of photosynthesis is false?

Accepted Answer

A)  Photophosphorylation results from the proton gradient across the thylakoid membrane. 
B)  Photosystem II is devoted to water oxidation. 
C)  P700 is Photosystem II. 
D)  Photosystem I is devoted to NADP+ reduction. 
A)  Photophosphorylation results from the proton gradient across the thylakoid membrane. 
B)  Photosystem II is devoted to water oxidation. 
C)  P700 is Photosystem II. 
D)  Photosystem I is devoted to NADP+ reduction.

Question 20

In which part of the chloroplast does reduction of CO2 during photosynthesis primarily occur?

Accepted Answer

A)  Grana. 
B)  Thylakoid disks. 
C)  Stroma. 
D)  Thylakoid space. 
E)  It is not known where this reaction occurs in the chloroplast. 
A)  Grana. 
B)  Thylakoid disks. 
C)  Stroma. 
D)  Thylakoid space. 
E)  It is not known where this reaction occurs in the chloroplast.

Exam 22: Photosynthesis

The essential enzyme for the C4 pathway is

After the reaction with Rubisco,the major difference between the Calvin Cycle and gluconeogenesis in liver is the following reaction:

Wavelengths of what color are mostly responsible for the reactions in the light phase of photosynthesis?

Which of the following is true?

The synthesis of ATP in chloroplasts uses a proton gradient similar to the one used in mitochondria.

After the CO2 fixation step in photosynthesis the production of sugars takes place

The light reactions drive the redox process that involves the following pairs of reactants/products

In which part of the chloroplast does production of oxygen during photosynthesis primarily occur?

The enzyme,ribulose 1,5 bisphosphate carboxylase (Rubisco),is:

The dark phase of photosynthesis is closest to this other metabolic process:

While actively engaging in photosynthesis under illumination,

The production of ATP in photosynthesis

After the formation of 3-phosphoglyceric acid,the reactions in the dark phase of photosynthesis are essentially the same as those in gluconeogenesis.

It is believed that the ratio of cyclic electron transport to Z-scheme photosynthesis changes in response to metabolic demands.If a plant were using the C4 Hatch-Slack pathway,how would it alter these processes compared to a plant just performing the standard C3 Calvin cycle to produce glucose?

The Hatch-Slack Pathway is important in tropical zones since,in order to conserve water,the pores of tropical leaves are very small.

Of the two photosynthetic pathways,Calvin Cycle or Hatch-Slack Pathway,only the Calvin Cycle uses the pentose phosphate pathway.

The nuclear gene for Rubisco codes for the catalytic subunit,while the regulatory gene is found in the chloroplast.

In the Calvin cycle a reshuffling of intermediates is necessary

Which of the following statements concerning the light reactions of photosynthesis is false?

In which part of the chloroplast does reduction of CO2 during photosynthesis primarily occur?

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 essential enzyme for the C₄ pathway is

After the CO₂ fixation step in photosynthesis the production of sugars takes place

It is believed that the ratio of cyclic electron transport to Z-scheme photosynthesis changes in response to metabolic demands.If a plant were using the C₄ Hatch-Slack pathway,how would it alter these processes compared to a plant just performing the standard C₃ Calvin cycle to produce glucose?

In which part of the chloroplast does reduction of CO₂ during photosynthesis primarily occur?