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

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Question 23

A cell is preparing to copy a section of one of its DNA molecules.

Which statement describes the change needed before the genetic code can be copied?

[1]
A

Every base separates from the sugar in its nucleotide.

B

Hydrogen bonds along each sugar-phosphate backbone are broken.

C

Hydrogen bonds between paired bases on the two strands are broken.

D

Each sugar-phosphate backbone separates into individual nucleotides.

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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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