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

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Question 13

Scientists analyse a short fragment of double-stranded DNA from a seal. The fragment contains 260 adenine (A) bases and 190 guanine (G) bases.

How many bases does the fragment contain in total?

[1]
A

710710710

B

900900900

C

450450450

D

640640640

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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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