Question 1

In C4 plants, CO2 in the mesophyll cell reacts with _________ to form oxaloacetate while in the bundle sheath cell, _________ undergoes decarboxylation to pyruvate.

Accepted Answer

A) pyruvate; aspartate 
B) phosphoenolpyruvate; oxaloacetate 
C) pyruvate; malate 
D) phosphoenolpyruvate; malate 
E) 3-phosphoglycerate; oxaloacetate 
A) pyruvate; aspartate 
B) phosphoenolpyruvate; oxaloacetate 
C) pyruvate; malate 
D) phosphoenolpyruvate; malate 
E) 3-phosphoglycerate; oxaloacetate

Question 2

Which of the following correctly identifies the proton pumping in the two-photosystem light reactions?

Accepted Answer

A) PSII: 4 protons; cytochrome b6f complex: 8 protons 
B) cytochrome b6f complex: 8 protons; PSI: 4 protons 
C) PSII: 4 protons; ferredoxin-NADP+ oxidoreductase: 4 protons 
D) PSII: 4 protons; PSI: 4 protons; ferredoxin-NADP+ oxidoreductase: 4 protons 
E) none of the above 
A) PSII: 4 protons; cytochrome b6f complex: 8 protons 
B) cytochrome b6f complex: 8 protons; PSI: 4 protons 
C) PSII: 4 protons; ferredoxin-NADP+ oxidoreductase: 4 protons 
D) PSII: 4 protons; PSI: 4 protons; ferredoxin-NADP+ oxidoreductase: 4 protons 
E) none of the above

Question 3

Which of the following best describes photosynthesis in purple photosynthetic bacteria?

Accepted Answer

A) a reaction center resembling PSI transfers electrons to plastocyanin 
B) a reaction center resembling PSII transfers electrons to plastoquinone 
C) water is split by the reaction center that resembles PSII 
D) NADPH is generated using electrons from a protein resembling ferredoxin 
E) the proton gradient is used for both ATP synthesis and NADPH generation 
A) a reaction center resembling PSI transfers electrons to plastocyanin 
B) a reaction center resembling PSII transfers electrons to plastoquinone 
C) water is split by the reaction center that resembles PSII 
D) NADPH is generated using electrons from a protein resembling ferredoxin 
E) the proton gradient is used for both ATP synthesis and NADPH generation

Question 4

Which of the following would have an inhibitory effect upon rubisco?

Accepted Answer

A) Mg2+ 
B) CO2 
C) H+ 
D) reduced thioredoxin 
E) none of the above 
A) Mg2+ 
B) CO2 
C) H+ 
D) reduced thioredoxin 
E) none of the above

Question 5

If the following 14C labeled molecules served as substrates for rubisco (the labeled carbons are indicated with *), where would the 14C labels end up in the immediate product(s)of the reaction? Draw the product(s), clearly showing which atom(s)would be labeled.

Accepted Answer

Question 6

The regeneration phase of the dark reactions are best considered in terms of regenerating 6 molecules of ribulose-1,5-bisphosphate, a process that requires 6 ATP. Considering the number of photons required for production of ATP in the light reactions, on average, how many photons must be absorbed for each molecule of ribulose-1,5-bisphosphate regenerated?

Accepted Answer

A) 1.5 
B) 3 
C) 4.5 
D) 6 
E) 9 
A) 1.5 
B) 3 
C) 4.5 
D) 6 
E) 9

In C₄ plants, CO₂ in the mesophyll cell reacts with _ to form oxaloacetate while in the bundle sheath cell, _ undergoes decarboxylation to pyruvate.

Which of the following correctly identifies the proton pumping in the two-photosystem light reactions?

Which of the following best describes photosynthesis in purple photosynthetic bacteria?

Which of the following would have an inhibitory effect upon rubisco?

If the following ¹⁴C labeled molecules served as substrates for rubisco (the labeled carbons are indicated with *), where would the ¹⁴C labels end up in the immediate product(s)of the reaction? Draw the product(s), clearly showing which atom(s)would be labeled.

The Scope of Biochemistry

The Matrix 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

Contractile Proteins and Molecular Motors

Carbohydrates: Sugars, Saccharides, Glycans

Lipids, Membranes and Cellular Transport

Enzymes: Biological Catalysts

Chemical Logic of Metabolism

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

Citric Acid Cycle and Glyoxylate Cycle

Electron Transport, Oxidative Phosphorylation, and Oxygen Metabolism

Lipid Metabolism I: Fatty Acids, Triacylglycerols, and Lipoproteins

Interorgan and Intracellular Coordination of Energy Metabolism in Vertebrates

Lipid Metabolism Ii: Membrane Lipids, Steroids, Isoprenoids, and Eicosanoids

Metabolism of Nitrogenous Compounds I: Principles of Biosynthesis, Utilization, and Turnover

Metabolism of Nitogenous Compounds II: Amino Acids, Porphyrins, and Neurotransmitters

Nucleotide Metabolism

Mechanisms of Signal Transduction

Genes, Genomes and Chromosomes

DNA Replication

DNA Restructuring: Repair, Recombination, Rearrangement, Amplification

Information Readout: Transcription and Post-Transcriptional Processing

Information Decoding: Translation and Post-Translational Protein Processing

Regulation of Gene Expression

Filters

Exam 16: Photosynthesis

In C4 plants, CO2 in the mesophyll cell reacts with _________ to form oxaloacetate while in the bundle sheath cell, _________ undergoes decarboxylation to pyruvate.

Which of the following correctly identifies the proton pumping in the two-photosystem light reactions?

Which of the following best describes photosynthesis in purple photosynthetic bacteria?

Which of the following would have an inhibitory effect upon rubisco?

If the following 14C labeled molecules served as substrates for rubisco (the labeled carbons are indicated with *), where would the 14C labels end up in the immediate product(s)of the reaction? Draw the product(s), clearly showing which atom(s)would be labeled.

The Scope of Biochemistry

The Matrix 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

Contractile Proteins and Molecular Motors

Carbohydrates: Sugars, Saccharides, Glycans

Lipids, Membranes and Cellular Transport

Enzymes: Biological Catalysts

Chemical Logic of Metabolism

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

Citric Acid Cycle and Glyoxylate Cycle

Electron Transport, Oxidative Phosphorylation, and Oxygen Metabolism

Lipid Metabolism I: Fatty Acids, Triacylglycerols, and Lipoproteins

Interorgan and Intracellular Coordination of Energy Metabolism in Vertebrates

Lipid Metabolism Ii: Membrane Lipids, Steroids, Isoprenoids, and Eicosanoids

Metabolism of Nitrogenous Compounds I: Principles of Biosynthesis, Utilization, and Turnover

Metabolism of Nitogenous Compounds II: Amino Acids, Porphyrins, and Neurotransmitters

Nucleotide Metabolism

Mechanisms of Signal Transduction

Genes, Genomes and Chromosomes

DNA Replication

DNA Restructuring: Repair, Recombination, Rearrangement, Amplification

Information Readout: Transcription and Post-Transcriptional Processing

Information Decoding: Translation and Post-Translational Protein Processing

Regulation of Gene Expression

Filters

In C₄ plants, CO₂ in the mesophyll cell reacts with _ to form oxaloacetate while in the bundle sheath cell, _ undergoes decarboxylation to pyruvate.

If the following ¹⁴C labeled molecules served as substrates for rubisco (the labeled carbons are indicated with *), where would the ¹⁴C labels end up in the immediate product(s)of the reaction? Draw the product(s), clearly showing which atom(s)would be labeled.