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

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Question 25
F

Enzymes are biological catalysts.

The Figure shows an enzyme and three different molecules, P, Q and R.

Figure

image

a.

Name the part of the enzyme labelled X.

[1]
b.

Which molecule, P, Q or R, is the substrate of this enzyme?

[1]
c.

State what is meant by a catalyst.

[1]
d.

Explain why this enzyme cannot break down molecule P.

[2]
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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