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

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Question 24
F

A student increases the concentration of substrate in an enzyme-controlled reaction.

The rate of reaction increases at first and then stays the same.

Why does the rate stop increasing at high substrate concentrations?

[1]
A

All of the active sites are occupied by substrate molecules.

B

The enzyme has been denatured by the extra substrate added.

C

The substrate molecules have run out of kinetic energy.

D

The products have all been used up by the enzyme molecules.

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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