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

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Question 7

Researchers study a double-stranded DNA fragment from a coral. They separate the two strands and analyse one strand only.

On this strand, 18% of the bases are adenine (A) and 22% of the bases are thymine (T).

Calculate the percentage of the bases in the complete double-stranded fragment that are adenine, and the percentage that are guanine.

Show your working.

[3]
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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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