Practice 8.1 Metabolism with authentic IB Biology exam questions for both SL and HL students. This question bank mirrors Paper 1A, 1B, 2 structure, covering key topics like cell biology, genetics, and ecology. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.
Paper
Level
Question 1
SLPaper 2
1.[6]
Draw and label a diagram of the carbon cycle.
2.[4]
Outline the effect of carbon dioxide concentration on the rate of photosynthesis and how this can be measured by carbon dioxide uptake.
3.[5]
Explain how carbon dioxide is produced in anaerobic and in aerobic respiration.
Question 2
SLPaper 1A
Which of the following is considered an anabolic reaction in cellular metabolism?
Question 3
HLPaper 1A
Isoleucine will inhibit the reaction pathway shown below when the concentration of isoleucine exceeds the cell requirements.
threonine intermediate I intermediate II intermediate III intermediate IV isoleucine
Which enzyme does isoleucine inhibit?
Question 4
HLPaper 1A
What is the mechanism of sodium-potassium pumps in neurons that generates a resting potential by active transport?
Question 5
HLPaper 1A
Enzyme activity has been measured for two enzymes at different pH values.
At which pH is one enzyme optimal and the other enzyme denatured?
Question 6
HLPaper 2
1.[8]
Explain the reactions that occur in the matrix of the mitochondrion that are part of aerobic respiration.
2.[4]
Outline the differences between aerobic and anaerobic respiration.
3.[5]
The process of respiration involves many enzyme catalysed reactions. Describe what would happen to these enzymes if they were exposed to increasing temperatures.
Question 7
SLPaper 1A
Which variable has the least effect on enzyme activity?
Question 8
HLPaper 2
1.[3]
Outline the control of metabolism by end-product inhibition.
2.[3]
Outline the functions of rough endoplasmic reticulum and Golgi apparatus.
3.[7]
Explain how hydrophobic and hydrophilic properties contribute to the arrangement of molecules in a membrane.
Question 9
HLPaper 1A
The following graph shows energy changes with and without enzymes during a chemical reaction. Which letter represents the activation energy required to carry out this reaction without an enzyme catalyst?
Question 10
HLPaper 1A
Which of the following statements about pyruvate is true?