Question 1

Which of the following is NOT involved in the production of biochemical energy from light?

Accepted Answer

A) electron transfer 
B) Q cycle 
C) transmembrane pH gradient 
D) ribulose-1-phosphate phosphorylation 
A) electron transfer 
B) Q cycle 
C) transmembrane pH gradient 
D) ribulose-1-phosphate phosphorylation D

Question 2

How many CO₂ molecules (X)are required to balance this reaction?
12 NADPH + 12 H⁺ + 18 ATP + X CO₂ + 12 H₂O → C₆H₁₂O₆ + 12 NADP⁺ + 18 ADP + 18 Pᵢ

Accepted Answer

A) 3 
B) 6 
C) 12 
D) 18 
A) 3 
B) 6 
C) 12 
D) 18 B

Question 3

Which of the following is the photochemical event that is the essence of photosynthesis?

Accepted Answer

A) conversion of H₂O to O₂ 
B) phosphorylation of ADP 
C) light energy transduction to chemical energy 
D) fixation of CO₂ 
A) conversion of H₂O to O₂ 
B) phosphorylation of ADP 
C) light energy transduction to chemical energy 
D) fixation of CO₂ C

Question 4

Where do electrons from water ultimately flow to,via PSI and PSII?

Accepted Answer

A) NAPDH 
B) NADP+ 
C) NAD? 
D) NADH 
A) NAPDH 
B) NADP+ 
C) NAD? 
D) NADH

Question 5

Which of the following is NOT a property of photosystem II (PSII)?

Accepted Answer

A) light-driven H₂O evolution 
B) similar photosystem in photosynthetic bacteria 
C) uses quinines as terminal electron acceptors 
D) found in cyanobacteria,green algae,and higher plants 
A) light-driven H₂O evolution 
B) similar photosystem in photosynthetic bacteria 
C) uses quinines as terminal electron acceptors 
D) found in cyanobacteria,green algae,and higher plants

Question 6

In which of the following organelles does photosynthesis take place?

Accepted Answer

A) chloroplasts 
B) ribosomes 
C) membranes 
D) photoplasts 
A) chloroplasts 
B) ribosomes 
C) membranes 
D) photoplasts

Question 7

Light-dependent electron flow with the production of ATP can occur without the formation of NADPH.Which of the following photosystems is involved in this cyclic photophosphorylation?

Accepted Answer

A) P700 
B) photosystem II 
C) P680 
D) ferredoxin 
A) P700 
B) photosystem II 
C) P680 
D) ferredoxin

Question 8

Which of the following terms defines photophosphorylation?

Accepted Answer

A) activation of enzymes with light 
B) dephosphorylation of ATP,resulting in a photon of light being released 
C) ATP synthesis driven by light energy 
D) production of hexose from CO₂ 
A) activation of enzymes with light 
B) dephosphorylation of ATP,resulting in a photon of light being released 
C) ATP synthesis driven by light energy 
D) production of hexose from CO₂

Question 9

Many chlorophyll molecules absorb light and direct the energy to the reactive centres.Which of the following describes the term for the transfer of this absorbed energy?

Accepted Answer

A) fluorescence transfer 
B) resonance energy transfer 
C) photochemical emission 
D) energy transduction 
A) fluorescence transfer 
B) resonance energy transfer 
C) photochemical emission 
D) energy transduction

Question 10

Which of the following is a property of both the P700 and the P680 reaction centres?

Accepted Answer

A) involved in light-driven O₂ evolution 
B) contain chlorophyll monomers 
C) electron acceptors 
D) activated by visible light 
A) involved in light-driven O₂ evolution 
B) contain chlorophyll monomers 
C) electron acceptors 
D) activated by visible light

Question 11

Which of the following is NOT accomplished in the dark reactions of photosynthesis?

Accepted Answer

A) Carbon dioxide is fixed to ribulose-1,5-bisphosphate. 
B) Two molecules of 3-phosphoglycerate are produced. 
C) Glyceraldehyde-3-phosphate is used to synthesize glucose. 
D) ATP is produced. 
A) Carbon dioxide is fixed to ribulose-1,5-bisphosphate. 
B) Two molecules of 3-phosphoglycerate are produced. 
C) Glyceraldehyde-3-phosphate is used to synthesize glucose. 
D) ATP is produced.

Question 12

Which of the following statements regarding the enzyme rubisco is correct?

Accepted Answer

A) It releases 2 molecules of glyceraldehyde-3-phosphate as products. 
B) Ribulose-1,5-bisphosphate is the substrate and carbon dioxide is the product. 
C) Its catalytic site has both carboxylase and oxygenase activity. 
D) It is the least abundant enzyme in plants. 
A) It releases 2 molecules of glyceraldehyde-3-phosphate as products. 
B) Ribulose-1,5-bisphosphate is the substrate and carbon dioxide is the product. 
C) Its catalytic site has both carboxylase and oxygenase activity. 
D) It is the least abundant enzyme in plants.

Question 13

Which of the following two components constitute the proton-motive force?

Accepted Answer

A) an ATP/H⁺ ratio and an ion equilibrium 
B) pH gradient and an ATP/H⁺ ratio 
C) a membrane potential and a pH gradient 
D) an ATP/H⁺ ratio and a membrane potential 
A) an ATP/H⁺ ratio and an ion equilibrium 
B) pH gradient and an ATP/H⁺ ratio 
C) a membrane potential and a pH gradient 
D) an ATP/H⁺ ratio and a membrane potential

Question 14

Which of the following represents the molecules of A and B in the reaction sequence below?
Chl + hv → Chl*
Chl* + A → Chl.⁺ + A-
Chl⁺ + A- → Chl.⁺ + B⁺

Accepted Answer

A) chlorophyll 
B) electron-transfer 
C) proton-donor 
D) CO₂ 
A) chlorophyll 
B) electron-transfer 
C) proton-donor 
D) CO₂

Question 15

Which of the following sets of pathways is similar between plants and animals?

Accepted Answer

A) electron transport and the dark reactions of photosynthesis 
B) electron transport and pyruvate carboxylase 
C) the Hatch-Slack pathway (C-4)and pyruvate carboxylase 
D) the Hatch-Slack pathway (C-4)and the dark reactions of photosynthesis 
A) electron transport and the dark reactions of photosynthesis 
B) electron transport and pyruvate carboxylase 
C) the Hatch-Slack pathway (C-4)and pyruvate carboxylase 
D) the Hatch-Slack pathway (C-4)and the dark reactions of photosynthesis

Question 16

Which of the following is NOT a feature of cyclic photophosphorylation?

Accepted Answer

A) Oxygen is evolved. 
B) It utilizes cyt b6 of cyt f / cyt b6 complex. 
C) It does not utilize ferredoxin. 
D) PS I is involved. 
A) Oxygen is evolved. 
B) It utilizes cyt b6 of cyt f / cyt b6 complex. 
C) It does not utilize ferredoxin. 
D) PS I is involved.

Question 17

Which of the following best explains the involvement of light reactions in photosynthetic plants?

Accepted Answer

A) discharge of the proton gradient 
B) production of ATP and consumption of NADPH 
C) production of ATP and NADPH during cyclic photophosphorylation 
D) the splitting of 2 water molecules to produce molecular oxygen 
A) discharge of the proton gradient 
B) production of ATP and consumption of NADPH 
C) production of ATP and NADPH during cyclic photophosphorylation 
D) the splitting of 2 water molecules to produce molecular oxygen

Question 18

Which of the following enzymes catalyzes the reaction below?
Sedoheptulose-7-P + glyceraldehyde-3-P ↔ xylulose-5-P + ribose-5-P

Accepted Answer

A) isomerase 
B) transaldolase 
C) transketolase 
D) aldolase 
A) isomerase 
B) transaldolase 
C) transketolase 
D) aldolase

Question 19

Which of the following statements regarding the light reactions of photosynthesis is correct?

Accepted Answer

A) There are 2 distinct photosystems linked together by a mechanism similar to electron transport. 
B) The source for electrons is located in the stroma of the thylakoid. 
C) The Mn complex is the primary electron acceptor and is located on photosystem I. 
D) Plastoquinone is a fixed electron transporter in the system located in the inner membrane. 
A) There are 2 distinct photosystems linked together by a mechanism similar to electron transport. 
B) The source for electrons is located in the stroma of the thylakoid. 
C) The Mn complex is the primary electron acceptor and is located on photosystem I. 
D) Plastoquinone is a fixed electron transporter in the system located in the inner membrane.

Question 20

Which of the following structures is formed in chloroplasts when the thylakoid membrane is organized into paired folds?

Accepted Answer

A) stroma 
B) lamellae 
C) porin 
D) calcium channel 
A) stroma 
B) lamellae 
C) porin 
D) calcium channel

Exam 20: Photosynthesis

Which of the following is NOT involved in the production of biochemical energy from light?

How many CO₂ molecules (X)are required to balance this reaction? 12 NADPH + 12 H⁺ + 18 ATP + X CO₂ + 12 H₂O → C₆H₁₂O₆ + 12 NADP⁺ + 18 ADP + 18 Pᵢ

Which of the following is the photochemical event that is the essence of photosynthesis?

Where do electrons from water ultimately flow to,via PSI and PSII?

Which of the following is NOT a property of photosystem II (PSII)?

In which of the following organelles does photosynthesis take place?

Light-dependent electron flow with the production of ATP can occur without the formation of NADPH.Which of the following photosystems is involved in this cyclic photophosphorylation?

Which of the following terms defines photophosphorylation?

Many chlorophyll molecules absorb light and direct the energy to the reactive centres.Which of the following describes the term for the transfer of this absorbed energy?

Which of the following is a property of both the P700 and the P680 reaction centres?

Which of the following is NOT accomplished in the dark reactions of photosynthesis?

Which of the following statements regarding the enzyme rubisco is correct?

Which of the following two components constitute the proton-motive force?

Which of the following represents the molecules of A and B in the reaction sequence below? Chl + hv → Chl* Chl* + A → Chl.⁺ + A- Chl⁺ + A- → Chl.⁺ + B⁺

Which of the following sets of pathways is similar between plants and animals?

Which of the following is NOT a feature of cyclic photophosphorylation?

Which of the following best explains the involvement of light reactions in photosynthetic plants?

Which of the following enzymes catalyzes the reaction below? Sedoheptulose-7-P + glyceraldehyde-3-P ↔ xylulose-5-P + ribose-5-P

Which of the following statements regarding the light reactions of photosynthesis is correct?

Which of the following structures is formed in chloroplasts when the thylakoid membrane is organized into paired folds?

The Facts of Life: Chemistry Is the Logic of Biological Phenomena

Water: the Medium of Life

Thermodynamics of Biological Systems

Amino Acids

Proteins: Their Primary Structure and Biological Functions

Proteins: Secondary, tertiary, and Quaternary Structure

Carbohydrates and the Glycoconjugates of Cell Surfaces

Lipids

Lipid Biosynthesis

Membranes and Membrane Transport

The Reception and Transmission of Extracellular Information

Enzymes Kinetics and Specificity

Mechanisms of Enzyme Action

Enzyme Regulation

Molecular Motors

Nutrition and the Organization of Metabolism

Glycolysis

The Tricarboxylic Acid Cycle

Electron Transport and Oxidative Phosphorylation

Gluconeogenesis, glycogen Metabolism, and the Pentose Phosphate Pathway

Fatty Acid Catabolism

Nitrogen Acquisition and Amino Acid Metabolism

Nucleotides and Nucleic Acids

Structure of Nucleic Acids

Synthesis and Degradation of Nucleotides

Recombinant Dna: Cloning and Creation of Chimeric Genes

DNA Metabolism: Replication, recombination, and Repair

Transcription and the Regulation of Gene Expression

Protein Synthesis

Post-Transcriptional Regulation of Gene Expression

Completing the Protein Life Cycle: Folding, processing, and Degradation

Metabolic Integration and Organ Specialization

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