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IB Biology HL C1.2.7 Hl Nad As Hydrogen Carrier Questions

Learn how NAD accepts hydrogen during oxidation, becomes NADH, and carries electrons and protons to the electron transport chain in IB Biology HL C1.2.7.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how NAD accepts hydrogen during oxidation or dehydrogenation and is reduced to NADH.
  • Explain how reduced NAD carries electrons and protons to the electron transport chain.
  • Use NADH as a hydrogen or electron donor when explaining a reduction reaction in a metabolic pathway.

IB Biology HL C1.2.7 Hl Nad As Hydrogen Carrier Questions question 1

[Maximum number: 2]

Succinate is industrially produced by continuous fermentation. It is used as a raw material in the production of flavour enhancers, drugs and industrial chemicals. One method of increasing the production of succinate is to genetically modify E. coli to express high levels of formate dehydrogenase (FDH1). This results in the production of higher concentrations of NADH. The engineered pathway is shown as a bold dotted line in the image.

Figure for Question IB Biology HL C1.2.7 Hl Nad As Hydrogen Carrier Questions question 1 — IB Biology HL

Question (a)

(a)

Using the diagram, suggest a reason for high concentrations of NADH favouring the production of succinate.

[ 1 ]

Question (b)

(b)

Predict one metabolite other than succinate that will be produced in greater amounts if the amount of NADH available is increased.

[ 1 ]
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