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1.2 What happens in cells (and what do cells need)?

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Question 4

A laboratory is choosing the operating temperature for an amylase preparation. Preliminary results are shown in the table.

Temperature (∘C^\circ\text{C}∘C)Mean reaction time (s)
25185
3582
4546
55126
65294

The laboratory has:

  • amylase solution
  • starch solution
  • pH 7 buffer solution
  • iodine solution
  • a spotting tile
  • test tubes, syringes and dropping pipettes
  • an adjustable water bath and thermometer
  • a stopwatch.

Describe how the laboratory technician could carry out a further investigation to obtain a more precise and reliable estimate of the optimum temperature for this amylase. Use the preliminary results in your answer.

[6]
Markscheme

1.2 What happens in cells (and what do cells need)? Questions

  1. GCSE
  2. /Biology
  3. /1.2 What happens in cells (and what do cells need)?

184 exam-style questions on OCR GCSE Biology 1.2 What happens in cells (and what do cells need)?, covering 1.2.1 Structure of DNA, 1.2.2 Nucleotides and complementary bases, 1.2.3 Protein synthesis, 1.2.4 DNA structure and the proteins made, 1.2.5 Investigating enzymatic reactions, and 1.2.6 Mechanism of enzyme action. Each one has a worked solution and a mark scheme showing where the marks go.

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