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2.2 Stem cells

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Question 20
H

Macular degeneration is a condition in which cells in the retina of the eye die. This causes loss of sight.

Scientists have developed a treatment for macular degeneration. The Figure shows the stages in the treatment.

Figure

image

a.

Explain why embryonic stem cells are used in this treatment.

[2]
b.

In a trial, 12 patients were given this treatment.

  • The sight of 8 patients improved.
  • 1 patient developed an eye infection.
  • None of the patients developed a tumour.

Calculate the percentage of patients whose sight improved. Give your answer to the nearest whole number.

[2]
c.

A doctor said: "This trial proves that the treatment is safe for everyone with macular degeneration."

Evaluate the doctor's statement.

[3]
Markscheme

2.2 Stem cells Questions

  1. GCSE
  2. /Biology
  3. /2.2 Stem cells

46 exam-style questions on Edexcel GCSE Biology 2.2 Stem cells, covering 2.2.1 Function of stem cells and meristems and 2.2.2 Benefits and risks of stem cells. Each one has a worked solution and a mark scheme showing where the marks go.

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