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IB Biology HL C1.1 Enzymes and Metabolism Question Bank

Practise IB Biology HL C1.1 by explaining enzyme specificity, metabolic reactions, rate evidence, inhibition and feedback control in biological pathways.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • explain enzyme specificity through active-site chemistry, substrate binding and induced fit
  • distinguish anabolic reactions that build molecules from catabolic reactions that release smaller products
  • interpret enzyme-rate graphs using temperature, pH, substrate concentration and controlled variables
  • distinguish competitive and non-competitive inhibition using binding sites and substrate-concentration graphs
  • explain feedback inhibition when an end product binds allosterically to regulate an earlier pathway enzyme

Covered syllabus points

C1.1.1—Enzymes as catalystsC1.1.2—Role in metabolismC1.1.3—Anabolic and catabolic reactionsC1.1.4—Enzymes as globular proteinsC1.1.5—Induced-fit bindingC1.1.6—Molecular motionC1.1.7—Relationships between structure and functionC1.1.8—Effects on enzyme activityC1.1.9—Measuring enzyme reactionsC1.1.10—Effect of enzymes on activation energyC1.1.11 (HL)—Intracellular vs. extracellular enzymesC1.1.12 (HL)—Heat generationC1.1.13 (HL)—Cyclical and linear pathways in metabolismC1.1.14 (HL)—Allosteric sites and non-competitive inhibitionC1.1.15 (HL)—Competitive inhibitionC1.1.16 (HL)—Feedback inhibitionC1.1.17 (HL)—Mechanism-based inhibition

C1.1 Enzymes and metabolism question 1

[Maximum number: 4]

Outline the action of enzymes.

C1.1 Enzymes and metabolism question 2

[Maximum number: 6]

Question (a)

(a)

Identify the following processes as either anabolism or catabolism by placing a tick ( ✓ ) in the correct box.

Table for Question (a) — IB Biology HL
[ 2 ]

Question (b)

(b)

Outline the importance of enzymes to metabolic processes.

[ 4 ]

C1.1 Enzymes and metabolism question 3

[Maximum number: 1]

What is an example of anabolism?

A

Formation of peptides after protein digestion

B

Formation of glucose and fructose from sucrose

C

Formation of maltose from two glucose molecules

D

Formation of glycerol and fatty acids from triglycerides

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