Nucleic Acids Into to DNA

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DNA Genetic information Deoxyribnucleic acid (DNA) – Stored in the nucleus of the cell – a polymer made up of nucleotides

Nucleotides Building block of nucleic acids The monomer of nucleic acids – Only 4 types – Made up of 3 parts Sugar Phosphate group Nitrogenous base

4 types of nucleotides Pyrimidines Thymine (T) Cystine (C) Purines Adenine (A) Guanine (G) Single-ring structureDouble-ring structure Differ only in the nitrogenous bases

Nucleotides Joined together by a covalent bond between sugar and phosphate group – Backbone – Nitrogenous bases line up along backbone

Nucleotides Polymers can form many different sequences – Vary in sequence & length – Unlimited possible combinations

The Double Helix Watson and Crick – Created the model – 2 strands wound about each other – This twisted shape known as the Double Helix

Double Helix Sugar-phosphate group is on the outside Nitrogenous bases are on the inside forming hydrogen bonds Watson & Crick realized the pairs were purposeful – Based on size and ability to form a bond

Double Helix Purines bind with the pyrimidines – Adenine  ThyamineA—T – Guanine  CystosineG—C Called complementary bases