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  • AQA
  • A Level Biology
  • Unit 4 - Genetic information, variation and relationships between organisms
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Summary Ch 8 DNA, genes and protein synthesis notes A* AQA A Level Biology

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2020/2021 Written for academic year
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Unit 4 - Genetic information, variation and relationships between organisms
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A set of thorough and concise notes created and used by an A* grade student to revise DNA, genes and protein synthesis (ch 8 from the A Level AQA Biology course). The notes are detailed and clearly explain the topic by breaking each process down into steps. It includes clear and detailed diagrams and includes all content from ch 8 of the AQA A Level Biology specification and textbook.

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8.1 Genes and the
genetic code

,What is a gene?
• Gene = section of DNA that contains the coded information for
making polypeptides or functional RNA
• Gene locus = location of the gene on a chromosome


DNA triplets  Amino acids  Polypeptide

, Why triplets?
• There are 20 amino acids
• There need to be enough different combinations of bases to code f
20 amino acids
• It couldn’t be one base coding for one amino acid because this wou
only make 4 combinations
• It couldn’t be 2 bases per amino acid because this would make only
16 combinations
• It had to be 3 – this made 64 combinations
• Therefore, most amino acids have multiple triplets that can code fo
them
Connected book
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Glenn Toole, Susan Toole AQA Biology A Level Student Book
Publisher: januari 2015 ISBN: 9780198351764 Edition: 1

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Study Level
A/AS Level
Subject
A Level Biology
Summarized whole book?
No
Which chapters are summarized?
Ch 8 dna, genes and protein synthesis
Uploaded on
May 28, 2022
Number of pages
28
Written in
2020/2021
Type
Summary
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Subjects

  • aqa
  • a level
  • biology
  • ch 8
  • dna
  • genes
  • protein synthesis
  • transcription
  • translation
  • splicing
  • a
  • notes

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