Question 1

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. 
E)  none of these 
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. 
E)  none of these

Question 2

Which of these statements concerning the Calvin Cycle is false?

Accepted Answer

A)  There is significant overlap between these reactions and glycolysis. 
B)  During the process, ATP is used with an ADP product. 
C)  Fructose 1,6 bisphosphate is an intermediate in this pathway. 
D)  NADP+ is converted to NADPH during this pathway. 
E)  At least one reduction reaction occurs during this pathway. 
A)  There is significant overlap between these reactions and glycolysis. 
B)  During the process, ATP is used with an ADP product. 
C)  Fructose 1,6 bisphosphate is an intermediate in this pathway. 
D)  NADP+ is converted to NADPH during this pathway. 
E)  At least one reduction reaction occurs during this pathway.

Question 3

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.

Question 4

Two different types of chlorophyll are used by most plants for the following reason:

Accepted Answer

A)  Two chlorophylls allow for absorbing light from a larger portion of the light spectrum. 
B)  The different chorophylls are used in different parts of the photosynthesis process. 
C)  One type is used in photosystem I and the other in phototsystem II. 
D)  The different chlorophylls are located in different compartments of the chloroplast. 
E)  It is not know why there are two different chlorophylls. 
A)  Two chlorophylls allow for absorbing light from a larger portion of the light spectrum. 
B)  The different chorophylls are used in different parts of the photosynthesis process. 
C)  One type is used in photosystem I and the other in phototsystem II. 
D)  The different chlorophylls are located in different compartments of the chloroplast. 
E)  It is not know why there are two different chlorophylls.

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 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 7

The efficiency of energy use in photosynthesis is approximately

Accepted Answer

A)  99% 
B)  65% 
C)  30% 
D)  2% 
A)  99% 
B)  65% 
C)  30% 
D)  2%

Question 8

In the first reaction of carbon dioxide fixation in photosynthesis, CO2 reacts with

Accepted Answer

A)  ribulose 5-phosphate. 
B)  ribulose 1,5-bisphosphate. 
C)  ribose 5-phosphate. 
D)  xylulose 5-phosphate. 
E)  glyceraldehyde 3-phosphate 
A)  ribulose 5-phosphate. 
B)  ribulose 1,5-bisphosphate. 
C)  ribose 5-phosphate. 
D)  xylulose 5-phosphate. 
E)  glyceraldehyde 3-phosphate

Question 9

The key element at the center of chlorophyll is

Accepted Answer

A)  chlorine. 
B)  copper. 
C)  iron. 
D)  magnesium. 
E)  manganese. 
A)  chlorine. 
B)  copper. 
C)  iron. 
D)  magnesium. 
E)  manganese.

Question 10

Photosynthetic bacteria which do not use water as the ultimate source of electrons

Accepted Answer

A)  only contain chlorophyll a. 
B)  only contain chlorophyll b. 
C)  do not produce oxygen. 
D)  have two photosystems. 
E)  none of these 
A)  only contain chlorophyll a. 
B)  only contain chlorophyll b. 
C)  do not produce oxygen. 
D)  have two photosystems. 
E)  none of these

Question 11

Light energy absorbed in chloroplasts is used in the light phase for all of these reactions, except:

Accepted Answer

A)  To reduce water. 
B)  To make ATP. 
C)  To generate NADPH. 
D)  To reduce water and to generate oxygen, O2. 
E)  All of these occur during the light phase. 
A)  To reduce water. 
B)  To make ATP. 
C)  To generate NADPH. 
D)  To reduce water and to generate oxygen, O2. 
E)  All of these occur during the light phase.

Question 12

Which of the following statements concerning the photosynthetic reaction center of Rhodopseudomonas viridis is false?

Accepted Answer

A)  There is a pair of chlorophylls in a special environment. 
B)  Accessory pigments play a role in trapping of light. 
C)  A separation of charge represents stored energy. 
D)  The electrons being transferred can take either of two possible paths. 
A)  There is a pair of chlorophylls in a special environment. 
B)  Accessory pigments play a role in trapping of light. 
C)  A separation of charge represents stored energy. 
D)  The electrons being transferred can take either of two possible paths.

Question 13

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 14

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

Accepted Answer

A)  There are two photosystems linked by an electron transport chain 
B)  Electron transport is coupled to production of ATP 
C)  The production of NADPH is carried out by Photosystem I, whereas the splitting of water is carried out by Photosystem II 
D)  Carbon dioxide fixation takes place 
A)  There are two photosystems linked by an electron transport chain 
B)  Electron transport is coupled to production of ATP 
C)  The production of NADPH is carried out by Photosystem I, whereas the splitting of water is carried out by Photosystem II 
D)  Carbon dioxide fixation takes place

Question 15

Accessory pigments

Accepted Answer

A)  transfer electrons to reaction center chlorophylls. 
B)  transfer energy to reaction center chlorophylls. 
C)  transfer electrons from reaction center chlorophylls to phaeophytins. 
D)  transfer electrons from reaction center chlorophylls to ferredoxin. 
E)  All of these statements are true. 
A)  transfer electrons to reaction center chlorophylls. 
B)  transfer energy to reaction center chlorophylls. 
C)  transfer electrons from reaction center chlorophylls to phaeophytins. 
D)  transfer electrons from reaction center chlorophylls to ferredoxin. 
E)  All of these statements are true.

Question 16

During Z-scheme photosynthesis, ferredoxin oxidizes NADPH.

Accepted Answer

A) True 
 B)False

Question 17

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.

Question 18

Presence of oxygen can poison the reaction of Rubisco, due to an alternate reaction in which the ribulose 1,5 bisphosphate is oxidized, rather than reacting with CO2

Accepted Answer

A) True 
 B)False

Question 19

The oxygen evolving complex consists of

Accepted Answer

A)  accessory pigments. 
B)  a manganese-containing protein. 
C)  the reaction center chlorophylls. 
D)  ferredoxin. 
E)  none of these 
A)  accessory pigments. 
B)  a manganese-containing protein. 
C)  the reaction center chlorophylls. 
D)  ferredoxin. 
E)  none of these

Question 20

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 synthesizing starch from the glucose produced, 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.

Exam 22: Photosynthesis

Chlorophyll differs from heme because it

Which of these statements concerning the Calvin Cycle is false?

During cyclic electron transport

Two different types of chlorophyll are used by most plants for the following reason:

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

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

The efficiency of energy use in photosynthesis is approximately

In the first reaction of carbon dioxide fixation in photosynthesis, CO2 reacts with

The key element at the center of chlorophyll is

Photosynthetic bacteria which do not use water as the ultimate source of electrons

Light energy absorbed in chloroplasts is used in the light phase for all of these reactions, except:

Which of the following statements concerning the photosynthetic reaction center of Rhodopseudomonas viridis is false?

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

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

Accessory pigments

During Z-scheme photosynthesis, ferredoxin oxidizes NADPH.

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

Presence of oxygen can poison the reaction of Rubisco, due to an alternate reaction in which the ribulose 1,5 bisphosphate is oxidized, rather than reacting with CO2

The oxygen evolving complex consists of

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

In the first reaction of carbon dioxide fixation in photosynthesis, CO₂ reacts with

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

Presence of oxygen can poison the reaction of Rubisco, due to an alternate reaction in which the ribulose 1,5 bisphosphate is oxidized, rather than reacting with CO₂