NUCLEIC ACIDS:.

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Presentation transcript:

NUCLEIC ACIDS:

NUCLEIC ACIDS = DNA & RNA Found in the nucleus of cells Contains hereditary information Chromosomes are made of DNA

NUCLEOTIDES!! Are the building blocks of DNA and RNA. They are made up of: Phosphate base sugar

NUCLEOTIDE CHAINS DNA and RNA are made of many nucleotides joined together. This is one nucleotide!

DNA CHAIN What nucleotides form the “backbone” of the chain? Phosphates Sugars

Sugar & Phosphate Backbone face inward in specific pairs DOUBLE HELIX Sugar & Phosphate Backbone = On the outside The bases face inward in specific pairs What do you notice about the base pairs?

DNA RNA Structure Sugar Bases Double Stranded “Double Helix” Single Stranded “Single Helix” Sugar Deoxyribose Ribose Bases Adenine (A) Guanine (G) Cytosine (C) Thymine (T) Uracil (U) Helix

DNA VS RNA Which bases are ONLY in RNA? Which bases are ONLY in DNA?

This is how bases ALWAYS pair in DNA: BASE PAIRING This is how bases ALWAYS pair in DNA: A-T G-C

A-U G-C BASE PAIRING Based on the way DNA pairs … How do you think the bases ALWAYS pair in RNA? A-U G-C