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

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Question 8

A technician adds a solution to a short section of DNA and records the observations shown in the table.

ObservationBefore the solution is addedWhile the solution is present
Base sequence of strand 1ACGTTCACGTTC
Base sequence of strand 2TGCAAGTGCAAG
Arrangement of the strandsjoined togetherseparate

Explain the observations in the table and predict what will happen to the strands when the solution is removed.

[4]
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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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