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Page 1: Deoxyribo- nucleic Acid is made up of nucleotides

DNA

Page 2: Deoxyribo- nucleic Acid is made up of nucleotides

DNA Structure

Deoxyribo-nucleic Acid is made up of nucleotides

Page 3: Deoxyribo- nucleic Acid is made up of nucleotides

Nucleotides have 3 parts› Deoxyribose (sugar)

› Phosphate group› Nitrogenous base

Page 4: Deoxyribo- nucleic Acid is made up of nucleotides

Deoxyribose and Phosphate are in all nucleotides, but there are 4 different nitrogenous bases› Adenine› Guanine› Cytosine› Thymine

Page 5: Deoxyribo- nucleic Acid is made up of nucleotides

All nitrogenous bases contain rings

Adenine and Guanine contain 2 rings and are called Purines

Cytosine and Thymine contain 1 ring and are called Pyrimidines

Remember the phrase:› Pure As Gold

Page 6: Deoxyribo- nucleic Acid is made up of nucleotides

DNA History In 1953, Scientists

Watson and Crick made a model of DNA as a double helix – the spiral staircase shape.

When untwisted looks like a ladder

The sides of the ladder are the backbone and alternate with deoxyribose and phosphate

Page 7: Deoxyribo- nucleic Acid is made up of nucleotides

The bases bond the two strands in the middle

A purine always bonds with a pyrimidine so the length is the same

They are bonded together by hydrogen bonds

Page 8: Deoxyribo- nucleic Acid is made up of nucleotides

Complementary Base Pairing

Cytosine always bonds with Guanine› Hint: (C and G

are letters that look alike)

Adenine always bonds with Thyamine› Hint: (A and T

are letters made of straight lines)

Page 9: Deoxyribo- nucleic Acid is made up of nucleotides

What is the complementary base sequence of this strand of DNA?

Page 10: Deoxyribo- nucleic Acid is made up of nucleotides

The order and sequence of these bases is what makes each of us different from one another and different from other species


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