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

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Question 1

A base-counting instrument analyses all the DNA in one seaweed cell. It records 7.50 × 109 bases altogether, including 2.13 × 109 thymine (T) bases.

Use these readings to calculate how many cytosine (C) bases are present. Write the result in standard form, correct to 2 significant figures.

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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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