CourseCourseConceptConceptDocsDocuments

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

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

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Identify NAD as a hydrogen/electron carrier and NADH as its reduced form in respiration.
  • Explain how NAD accepts hydrogen or electrons during oxidation/dehydrogenation and is reduced to NADH in respiration.
  • Use NADH evidence to explain reducing-agent or electron-donor roles in respiration and related pathways.

Learn this topic

Study C1.2.7 (HL)—NAD as hydrogen carrier conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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 ]
All question bank results loaded