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

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Question 37
H

Pepsin is an enzyme with an optimum pH of 2.

Which statement explains why the rate of reaction of pepsin decreases when the pH is raised from 2 to 6?

[1]
A

The molecules have less kinetic energy, so there are fewer collisions.

B

The substrate is denatured, so it can no longer be broken down.

C

The enzyme is used up more quickly, so fewer molecules are left.

D

The shape of the active site changes, so fewer substrates can bind.

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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