Question 1

Upon which region of the light spectrum does photosynthesis mainly depend?

Accepted Answer

A)  Visible 
B)  Ultraviolet 
C)  Infrared 
D)  Visible and infrared 
E)  Visible and ultraviolet 
A)  Visible 
B)  Ultraviolet 
C)  Infrared 
D)  Visible and infrared 
E)  Visible and ultraviolet D

Question 2

Which of the following is NOT true considering the regulation of photosynthesis?

Accepted Answer

A)  Rubisco is activated by high pH. 
B)  Rubisco is activated by 2-carboxy-D-arabinitol-1-phosphate, which is synthesized in the dark. 
C)  Rubisco activase removes 2-carboxy-D-arabinitol-1-phosphate in the presence of light. 
D)  Several of the Calvin cycle enzymes respond to redox state. 
E)  Xylulose-1,5-phosphate inhibits Rubisco. 
A)  Rubisco is activated by high pH. 
B)  Rubisco is activated by 2-carboxy-D-arabinitol-1-phosphate, which is synthesized in the dark. 
C)  Rubisco activase removes 2-carboxy-D-arabinitol-1-phosphate in the presence of light. 
D)  Several of the Calvin cycle enzymes respond to redox state. 
E)  Xylulose-1,5-phosphate inhibits Rubisco. B

Question 3

A proton gradient is formed across the thylakoid membrane with the stroma becoming more acidic than the lumen.

Accepted Answer

A) True 
 B)False  False

Question 4

Which of the following represents the CORRECT order of events in the two-photosystem light reactions of photosynthesis?

Accepted Answer

A)  Photosystem I is the first to receive a photon of light. 
B)  Photosystem II receives electrons from plastocyanin at the end of the electron transfer chain from the excited reaction center of photosystem I. 
C)  Photosystem I receives electrons from plastocyanin at the end of the electron transfer chain from the excited reaction center of photosystem II. 
D)  Photosystem I receives electrons from ferredoxin at the end of the electron transfer chain from the excited reaction center of photosystem II. 
E)  The final electron acceptor, NADP+, receives electrons from plastocyanin at the end of the electron transfer chain from the excited reaction center of photosystem I. 
A)  Photosystem I is the first to receive a photon of light. 
B)  Photosystem II receives electrons from plastocyanin at the end of the electron transfer chain from the excited reaction center of photosystem I. 
C)  Photosystem I receives electrons from plastocyanin at the end of the electron transfer chain from the excited reaction center of photosystem II. 
D)  Photosystem I receives electrons from ferredoxin at the end of the electron transfer chain from the excited reaction center of photosystem II. 
E)  The final electron acceptor, NADP+, receives electrons from plastocyanin at the end of the electron transfer chain from the excited reaction center of photosystem I.

Question 5

The C4 photosynthesis pathway helps to provide CO2 to the carboxylase active site of Rubisco in conditions of high O2 concentration.

Accepted Answer

A) True 
 B)False

Question 6

The energy of a photon absorbed by an antenna molecule of the photosystem finds it way to a chlorophyll molecule in the reaction center of a light-harvesting complex by a process of:

Accepted Answer

A)  electron transfer. 
B)  fluorescence re-radiation. 
C)  resonance transfer. 
D)  resonance transfer and electron transfer. 
E)  electron transfer and fluorescence re-radiation. 
A)  electron transfer. 
B)  fluorescence re-radiation. 
C)  resonance transfer. 
D)  resonance transfer and electron transfer. 
E)  electron transfer and fluorescence re-radiation.

Question 7

Calculate the amount of energy required to make one mole of hexose from CO2 and water by photosynthesis if the average photon has an energy of 2.77 × 10-19 J and 48 photons are required for each 6C sugar. Assume the efficiency of photosynthesis is ~35%.

Accepted Answer

The answer of Calculate the amount of energy required to...

Question 8

Which of the following intermediates of the Calvin cycle is NOT used directly to regenerate ribulose-1,5-bisphosphate?

Accepted Answer

A)  Glyceraldehyde 3-phosphate 
B)  Dihydroxyacetone phosphate 
C)  Fructose 6-phosphate 
D)  Fructose 1,6-bisphosphate 
E)  Both C and D 
A)  Glyceraldehyde 3-phosphate 
B)  Dihydroxyacetone phosphate 
C)  Fructose 6-phosphate 
D)  Fructose 1,6-bisphosphate 
E)  Both C and D

Question 9

Photons with any energy value are able to cause transitions in the electronic states of organic molecules to drive reactions and thus capture light energy in chemical form.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following statements about photosynthesis is FALSE?

Accepted Answer

A)  The light reactions occur within or on the thylakoid membranes. 
B)  The dark reactions occur in the stroma of the chloroplast. 
C)  The light reactions oxidise water to oxygen, reducing NADP+ to NADPH in the process. 
D)  The dark reactions use the NADPH and ATP formed in the light reactions in reductive synthesis of carbohydrate from CO2 and water. 
E)  In plants much of the carbohydrate formed is stored as sucrose. 
A)  The light reactions occur within or on the thylakoid membranes. 
B)  The dark reactions occur in the stroma of the chloroplast. 
C)  The light reactions oxidise water to oxygen, reducing NADP+ to NADPH in the process. 
D)  The dark reactions use the NADPH and ATP formed in the light reactions in reductive synthesis of carbohydrate from CO2 and water. 
E)  In plants much of the carbohydrate formed is stored as sucrose.

Question 11

Photosynthesis is the major source of oxygen in Earth's atmosphere.

Accepted Answer

A) True 
 B)False

Question 12

Chlorophylls, carotenes and xanthophylls absorb light in the visible part of the spectrum because they contain large ________ double-bond systems.

Accepted Answer

The answer of Chlorophylls, carotenes and xanthophylls absorb light in...

Question 13

As well as acting as a carboxylase, Rubisco can act as an oxygenase under normal environmental conditions initiating a pathway known as ________ which produces 3-phosphoglycerate and 2-phosphoglycolate.

Accepted Answer

The answer of As well as acting as a carboxylase,...

Question 14

The plastoquinones associated with photosystem II proteins are structurally and functionally similar to ________ in the mitochondrial respiratory chain.

Accepted Answer

ubiquinone

Question 15

Water is oxidized to oxygen at the oxygen-evolving complex of photosystem II and released into the lumen of the thylakoid and diffuses out of the chloroplast.

Accepted Answer

A) True 
 B)False

Question 16

Cyclic electron flow through photosystem one and its associated electron transfer chain can be used to produce ATP when levels of ________ are very low.

Accepted Answer

The answer of Cyclic electron flow through photosystem one and...

Exam 15: Photosynthesis

Upon which region of the light spectrum does photosynthesis mainly depend?

Which of the following is NOT true considering the regulation of photosynthesis?

A proton gradient is formed across the thylakoid membrane with the stroma becoming more acidic than the lumen.

Which of the following represents the CORRECT order of events in the two-photosystem light reactions of photosynthesis?

The C4 photosynthesis pathway helps to provide CO2 to the carboxylase active site of Rubisco in conditions of high O2 concentration.

The energy of a photon absorbed by an antenna molecule of the photosystem finds it way to a chlorophyll molecule in the reaction center of a light-harvesting complex by a process of:

Calculate the amount of energy required to make one mole of hexose from CO2 and water by photosynthesis if the average photon has an energy of 2.77 × 10-19 J and 48 photons are required for each 6C sugar. Assume the efficiency of photosynthesis is ~35%.

Which of the following intermediates of the Calvin cycle is NOT used directly to regenerate ribulose-1,5-bisphosphate?

Photons with any energy value are able to cause transitions in the electronic states of organic molecules to drive reactions and thus capture light energy in chemical form.

Which of the following statements about photosynthesis is FALSE?

Photosynthesis is the major source of oxygen in Earth's atmosphere.

Chlorophylls, carotenes and xanthophylls absorb light in the visible part of the spectrum because they contain large ________ double-bond systems.

As well as acting as a carboxylase, Rubisco can act as an oxygenase under normal environmental conditions initiating a pathway known as ________ which produces 3-phosphoglycerate and 2-phosphoglycolate.

The plastoquinones associated with photosystem II proteins are structurally and functionally similar to ________ in the mitochondrial respiratory chain.

Water is oxidized to oxygen at the oxygen-evolving complex of photosystem II and released into the lumen of the thylakoid and diffuses out of the chloroplast.

Cyclic electron flow through photosystem one and its associated electron transfer chain can be used to produce ATP when levels of ________ are very low.

Biochemistry and the Language of Chemistry

The Chemical Foundation of Life: Weak Interactions in an Aqueous Environment

The Energetics of Life

Nucleic Acids

Introduction to Proteins: the Primary Level of Protein Structure

The Three-Dimensional Structure of Proteins

Protein Function and Evolution

Enzymes: Biological Catalysts

Carbohydrates: Sugars, Saccharides, Glycans

Lipids, Membranes, and Cellular Transport

Chemical Logic of Metabolism

Carbohydrate Metabolism: Glycolysis, Gluconeogenesis, Glycogen Metabolism, and the Pentose Phosphate Pathway

The Citric Acid Cycle

Electron Transport, Oxidative Phosphorylation, and Oxygen Metabolism

Lipid Metabolism

Interorgan and Intracellular Coordination of Energy Metabolism in Vertebrates

Amino Acid and Nitrogen Metabolism

Nucleotide Metabolism

Mechanisms of Signal Transduction

Genes, Genomes, and Chromosomes

DNA Replication

DNA Repair, Recombination, and Rearrangement

Transcription and Post-Transcriptional Processing

Information Decoding: Translation and Post-Translational Protein Processing

Regulation of Gene Expression

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