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2.2 Animal tissues, organs and organ systems

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Question 24
F

A student put amylase solution into a water bath at 80 °C for 10 minutes. The student then cooled the amylase solution to 30 °C, added starch solution, and tested for starch every 30 seconds for 10 minutes. Starch was still present after 10 minutes.

a.

Explain the result the student obtained.

[3]
b.

The student repeated the investigation using amylase that had been kept at 5 °C for 10 minutes instead of at 80 °C. This time all of the starch was broken down within 10 minutes.

Explain why.

[2]
c.

Give one reason why the student tested for starch every 30 seconds, rather than only at the end of the 10 minutes.

[1]
Markscheme

2.2 Animal tissues, organs and organ systems Questions

  1. GCSE
  2. /Biology
  3. /2.2 Animal tissues, organs and organ systems

179 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.

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