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

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Question 31

Enzyme R breaks down substrate S. A student measures the rate of this reaction at different pH values.

pHRate of substrate S broken down / mg min−1^{-1}−1
818
123

Explain the difference in the rate at pH 12 compared with pH 8.

[3]
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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