Use of Biological Resources

Worked examples (5)

• 1Describe the use of yeast in brewing (5 marks, Paper 1)
• 2Required practical — investigating respiration in yeast (6 marks, Paper 1)
• 3Describe the production of yoghurt (5 marks, Paper 1)
• 4Explain why fermenter conditions are carefully controlled (6 marks, Paper 2)
• 5Explain how glasshouses increase crop yield (5 marks, Paper 1)

Model answers (4)

• ✓Model answer — Adapted from 4BI1/1B Jan 2024 Q8(b)
• ✓Model answer — Adapted from 4BI1/2B May/Jun 2024 Q8(c)
• ✓Model answer — Adapted from 4BI1/2B Jan 2024 Q8(b)
• ✓Model answer — Adapted from 4BI1/2B Jan 2024 Q8(c)

Worked examples (4)

• 1Describe selective breeding for high milk yield (5 marks, Paper 1)
• 2Compare selective breeding and natural selection (4 marks, Paper 2)
• 3Explain inbreeding depression in pedigree dogs (5 marks, Paper 2)
• 4Selective breeding of wheat for disease resistance (5 marks, Paper 1)

Model answers (4)

• ✓Model answer — Adapted from 4BI1/2B Jan 2024 Q9(a)
• ✓Model answer — Adapted from 4BI1/2B May/Jun 2024 Q9(b)
• ✓Model answer — Adapted from 4BI1/2B Jan 2024 Q9(c)
• ✓Model answer — Adapted from 4BI1/2B May/Jun 2024 Q9(c)

Worked examples (4)

• 1Describe how GM bacteria are used to produce human insulin (8 marks, Paper 2)
• 2Explain how restriction enzymes work (5 marks, Paper 2)
• 3Advantages of GM insulin over animal insulin (4 marks, Paper 2)
• 4Discuss the benefits and risks of GM crops (6 marks, Paper 2)

Model answers (4)

• ✓Model answer — Adapted from 4BI1/2B Jan 2024 Q10(a)
• ✓Model answer — Adapted from 4BI1/2B May/Jun 2024 Q10(b)
• ✓Model answer — Adapted from 4BI1/2B Jan 2024 Q10(c)
• ✓Model answer — Adapted from 4BI1/2B May/Jun 2024 Q10(a)

Worked examples (4)

• 1Describe the steps of micropropagation (6 marks, Paper 2)
• 2Describe how cuttings are used to clone plants (4 marks, Paper 1)
• 3Describe how Dolly the sheep was cloned (8 marks, Paper 2)
• 4Discuss the ethical issues of animal cloning (5 marks, Paper 2)

Model answers (4)

• ✓Model answer — Adapted from 4BI1/2B Jan 2024 Q11(a)
• ✓Model answer — Adapted from 4BI1/2B May/Jun 2024 Q11(b)
• ✓Model answer — Adapted from 4BI1/2B Jan 2024 Q11(c)
• ✓Model answer — Adapted from 4BI1/2B May/Jun 2024 Q11(c)