Question 1

The reaction catalyzed by which enzyme in the Calvin cycle is unlikely to be a regulatory step?

Accepted Answer

A) Phosphoglycerate kinase. 
B) Triose phosphate isomerase. 
C) Phosphoribokinase. 
D) Rubisco. 
A) Phosphoglycerate kinase. 
B) Triose phosphate isomerase. 
C) Phosphoribokinase. 
D) Rubisco.

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

The formation of ATP is a(n)________ reaction in plants.

Accepted Answer

A) dark 
B) light independent 
C) light dependent 
D) anaerobic 
E) carbon fixation 
A) dark 
B) light independent 
C) light dependent 
D) anaerobic 
E) carbon fixation

Question 4

Which is NOT an intermediate in the biosynthesis of starch in plants?

Accepted Answer

A) ADP-glucose. 
B) UDP-glucose. 
C) Glucose -1 - phosphate. 
D) Glucose - 6 - phosphate. 
A) ADP-glucose. 
B) UDP-glucose. 
C) Glucose -1 - phosphate. 
D) Glucose - 6 - phosphate.

Question 5

What is the correct sequence for the following components in photosynthesis as described by the Z scheme?

Accepted Answer

A) NADPH → P700 → P700* → cytochrome bf complex → P680 → P680* → water. 
B) Water → P700 → P700* → cytochrome bf complex → P680* → P680 → NADPH. 
C) Water → P680 → P680* → cytochrome bf complex → P700 → P700* → NADPH. 
D) Water → P700 → P700* → cytochrome bf complex → P680 → P680* → NADPH. 
E) NADPH → P680 → P680* → cytochrome bf complex → P700 → P700* → water. 
A) NADPH → P700 → P700* → cytochrome bf complex → P680 → P680* → water. 
B) Water → P700 → P700* → cytochrome bf complex → P680* → P680 → NADPH. 
C) Water → P680 → P680* → cytochrome bf complex → P700 → P700* → NADPH. 
D) Water → P700 → P700* → cytochrome bf complex → P680 → P680* → NADPH. 
E) NADPH → P680 → P680* → cytochrome bf complex → P700 → P700* → water.

Question 6

Which is not a substance produced from the carbon dioxide assimilated via the Calvin cycle?

Accepted Answer

A) Cellulose. 
B) Starch. 
C) Sucrose. 
D) Chitin. 
A) Cellulose. 
B) Starch. 
C) Sucrose. 
D) Chitin.

Question 7

Cyanobacteria have evolved photosynthetic features not found in green sulfur bacteria.These include

Accepted Answer

A) cytochrome bc. 
B) synthesis of NADH. 
C) electron acceptor P700. 
D) an oxygen-evolving complex. 
E) All of the above. 
A) cytochrome bc. 
B) synthesis of NADH. 
C) electron acceptor P700. 
D) an oxygen-evolving complex. 
E) All of the above.

Question 8

Calculate the energy of a photon with a wavelength of 700 nm.(h = 6.63 × 10-³⁴ J s and c = 3.00 × 10⁸ m s-¹)

Accepted Answer

A) 2.8 × 10-²⁸ J 
B) 2.8 × 10-¹⁹ J 
C) 1.3 × 10-²² J 
D) 3.6 × 10¹⁸ J 
A) 2.8 × 10-²⁸ J 
B) 2.8 × 10-¹⁹ J 
C) 1.3 × 10-²² J 
D) 3.6 × 10¹⁸ J

Question 9

Photosynthesis in PS I is non-cyclic because

Accepted Answer

A) it is slower than those in PS II. 
B) reaction centers must be reduced by electrons from another source. 
C) reaction centers are more tightly packed in the photosystem complexes. 
D) there can never exist a cyclic process of electron transfer in these photosystems. 
A) it is slower than those in PS II. 
B) reaction centers must be reduced by electrons from another source. 
C) reaction centers are more tightly packed in the photosystem complexes. 
D) there can never exist a cyclic process of electron transfer in these photosystems.

Question 10

Which is not directly exposed to the stroma,but is exposed to the thylakoid lumen?

Accepted Answer

A) PSI. 
B) PSII. 
C) both PSI and PSII. 
D) None of the above because both PSI and PSII are exposed to the stroma. 
A) PSI. 
B) PSII. 
C) both PSI and PSII. 
D) None of the above because both PSI and PSII are exposed to the stroma.

Question 11

The round(R)and wrinkled(r)peas studied by Gregor Mendel differ in the gene for starch branching enzyme.

Accepted Answer

A) True 
 B)False

Question 12

Photorespiration is a vital plant pathway that provides energy for cellular metabolism.

Accepted Answer

A) True 
 B)False

Question 13

Electron carriers between activated P680* and P700 photosystems include

Accepted Answer

A) plastoquinones. 
B) pheophytin. 
C) ferredoxin and iron - sulfur clusters. 
D) All of the above. 
E) A and B. 
A) plastoquinones. 
B) pheophytin. 
C) ferredoxin and iron - sulfur clusters. 
D) All of the above. 
E) A and B.

Question 14

Chlorophyll molecules contain hydrophilic regions containing bonds for light-absorbing and hydrophobic regions anchoring them to membranes.

Accepted Answer

A) True 
 B)False

Question 15

Which statement is false about ferredoxin?

Accepted Answer

A) It is produced by PSII. 
B) It is reduced by PSII. 
C) It participates in the reduction of NADP+. 
D) It can serve as an electron donor to cytochrome bf. 
A) It is produced by PSII. 
B) It is reduced by PSII. 
C) It participates in the reduction of NADP+. 
D) It can serve as an electron donor to cytochrome bf.

Question 16

The light reactions of photosynthesis form carbohydrates from ATP,NADPH,H+ and CO2

Accepted Answer

A) True 
 B)False

Question 17

Although a variety of pigments absorb light,only the special pair of chlorophyll molecules at photosystems I and II can become activated and thereby provide electrons for transport.

Accepted Answer

A) True 
 B)False

Question 18

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 rubisco's 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 rubisco's activity in the dark

Question 19

What is the product of the reaction catalyzed by rubisco in the Calvin cycle?

Accepted Answer

A) Dihydroxyacetone phosphate. 
B) 3-phosphoglycerate. 
C) Ribose 5-phosphate. 
D) Fructose 6-phosphate. 
A) Dihydroxyacetone phosphate. 
B) 3-phosphoglycerate. 
C) Ribose 5-phosphate. 
D) Fructose 6-phosphate.

Question 20

How many ATP molecules are required for the fixation of one CO2 molecule via the Calvin cycle to a triose phosphate?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Exam 15: Photosynthesis

The reaction catalyzed by which enzyme in the Calvin cycle is unlikely to be a regulatory step?

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

The formation of ATP is a(n)________ reaction in plants.

Which is NOT an intermediate in the biosynthesis of starch in plants?

What is the correct sequence for the following components in photosynthesis as described by the Z scheme?

Which is not a substance produced from the carbon dioxide assimilated via the Calvin cycle?

Cyanobacteria have evolved photosynthetic features not found in green sulfur bacteria.These include

Calculate the energy of a photon with a wavelength of 700 nm.(h = 6.63 × 10-³⁴ J s and c = 3.00 × 10⁸ m s-¹)

Photosynthesis in PS I is non-cyclic because

Which is not directly exposed to the stroma,but is exposed to the thylakoid lumen?

The round(R)and wrinkled(r)peas studied by Gregor Mendel differ in the gene for starch branching enzyme.

Photorespiration is a vital plant pathway that provides energy for cellular metabolism.

Electron carriers between activated P680* and P700 photosystems include

Chlorophyll molecules contain hydrophilic regions containing bonds for light-absorbing and hydrophobic regions anchoring them to membranes.

Which statement is false about ferredoxin?

The light reactions of photosynthesis form carbohydrates from ATP,NADPH,H+ and CO2

Although a variety of pigments absorb light,only the special pair of chlorophyll molecules at photosystems I and II can become activated and thereby provide electrons for transport.

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

What is the product of the reaction catalyzed by rubisco in the Calvin cycle?

How many ATP molecules are required for the fixation of one CO2 molecule via the Calvin cycle to a triose phosphate?

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 Atp Synthesis

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Nucleic Acids

DNA Replication, repair, and Recombination

Transcription and RNA Processing

Protein Synthesis

Filters

The light reactions of photosynthesis form carbohydrates from ATP,NADPH,H+ and CO₂

How many ATP molecules are required for the fixation of one CO₂molecule via the Calvin cycle to a triose phosphate?