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IB Biology HL 1.2.7 NAD as hydrogen carrier Question Bank

Practise IB Biology HL 1.2.7 by applying nad as hydrogen carrier concepts to exam-style questions.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • identify the relevant biological structure, process or evidence
  • apply the correct biological mechanism to the question
  • evaluate the result using data, adaptation or ecological reasoning

C1.2.7 (HL)—NAD as hydrogen carrier question 1

[Maximum number: 1]

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 C1.2.7 (HL)—NAD as hydrogen carrier question 1 — IB Biology HL

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

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