(FREE) 2.9 (i), (ii) - Structure of DNA & Complimentary Base Pairings - IAL Biology - Edexcel

IAL Biology (Edexcel) - Unit 1 (Topic 2)

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2.9 (i), (ii) - Know the basic structure of mononucleotides (deoxyribose or ribose linked to a phosphate and a base, including thymine, uracil, adenine, cytosine or guanine)
and the structures of DNA and RNA (polynucleotides composed of mononucleotides linked by condensation reactions to form phosphodiester bonds)

Know how complementary base pairing and the hydrogen bonding between two complementary strands are involved in the formation of the DNA double helix

Introduction to the structure of DNA as in 2.9 (i). Includes the following:

• Steps to draw pentose sugar, phosphate group (with phosphoester bonding), and nitrogenous base
• Different purines and pyramidines
• Complimentary base bairing
• Polynucelotide formation
• Practice exam questions (PEQ)

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