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

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Question 1
60%

A section of double-stranded DNA is analysed to find the percentage of each of the four bases present. It is found that 22% of the DNA bases are adenine.

What is the percentage of the other bases in this section of DNA?

A

22%22\%22% Cytosine, 28%28\%28% Guanine, 28%28\%28% Thymine

B

28%28\%28% Cytosine, 28%28\%28% Guanine, 22%22\%22% Thymine

C

22%22\%22% Cytosine, 22%22\%22% Guanine, 56%56\%56% Thymine

D

28%28\%28% Cytosine, 22%22\%22% Guanine, 28%28\%28% Thymine

Markscheme

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)?

72 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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