Question 1

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)  18E) C) and D)
F) A) and B) B

Question 2

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 oxygenE) A) and B)
F) A) and C)

Question 3

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)  aldolaseE) B) and D)
F) A) and D)

Question 4

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 phosphorylationE) A) and B)
F) A) and C) D

Question 5

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 CO₂E) A) and B)
F) A) and C)

Question 6

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.E) A) and D)
F) B) and C)

Question 7

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.E) C) and D)
F) A) and B)

Question 8

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 photosynthesisE) None of the above
F) A) and C)

Question 9

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)  CO₂E) B) and D)
F) B) and C)

Question 10

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.E) A) and C)
F) B) and C)

Question 11

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

Accepted Answer

A)  NAPDH
B)  NADP+
C)  NAD?
D)  NADHE) B) and C)
F) A) and B)

Question 12

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)  ferredoxinE) None of the above
F) A) and B)

Question 13

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.E) A) and B)
F) A) and C)

Question 14

In which of the following organelles does photosynthesis take place?

Accepted Answer

A)  chloroplasts
B)  ribosomes
C)  membranes
D)  photoplastsE) All of the above
F) A) and B)

Question 15

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 CO₂E) B) and D)
F) A) and B) C

Question 16

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 plantsE) A) and B)
F) None of the above

Question 17

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 lightE) B) and C)
F) None of the above

Question 18

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 channelE) None of the above
F) A) and C)

Question 19

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 transductionE) None of the above
F) A) and B)

Question 20

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 potentialE) C) and D)
F) A) and B)

Exam 20: Photosynthesis

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

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

Which of the following terms defines photophosphorylation?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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⁺

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In which of the following organelles does photosynthesis take place?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified