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

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Question 19

A genomic analysis of a double-stranded DNA plasmid extracted from a novel halophilic archaeon reveals that 18% of the nucleotides contain the purine base adenine (A).

What are the expected percentages of the remaining nitrogenous bases in this plasmid sample?

A

Thymine (T) 32%32\%32%, Guanine (G) 32%32\%32%, Cytosine (C) 18%18\%18%

B

Thymine (T) 18%18\%18%, Guanine (G) 32%32\%32%, Cytosine (C) 32%32\%32%

C

Thymine (T) 32%32\%32%, Guanine (G) 18%18\%18%, Cytosine (C) 18%18\%18%

D

Thymine (T) 18%18\%18%, Guanine (G) 18%18\%18%, Cytosine (C) 46%46\%46%

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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