Summary
nucleic acids biology summary
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- OCR
summary on topic of nucleic acids in module 2 of a level biology including protein synthesis, dna semi-conservative replication, DNA, RNA
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Nucleic acidsBIOLOGY
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Notes
DNA
Purines : A, G
Double carbon ring structure
Pyrimidine : T, C (U in RNA)
Single carbon ring structure
Base pairing
● Small pyrimidine binds with large purine (constant distance btw DNA backbones =
parallel polynucleotide chains)
● DNA has equal amounts of A + T and C + G
● 2 strands held together through hydrogen bonding btw complementary bases
● 2 anti-parallel polynucleotide strands twist
● PO₄ ³- at C5 of pentose sugar forms a phosphodiester bond (covalent) with OH group at
C3 of other nucleotide
● Sugar-phosphate backbone
● Catalysed by DNA polymerase
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