nucleic acids into to dna. video

Nucleic Acids Into to DNA

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Nucleic Acids

Into to DNA

Video

• http://youtu.be/zwibgNGe4aY

http://youtu.be/zwibgNGe4aY

Page 3: Nucleic Acids Into to DNA. Video

DNA

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

Page 4: Nucleic Acids Into to DNA. Video

Nucleotides

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

Page 5: Nucleic Acids Into to DNA. Video

4 types of nucleotides

Pyrimidines• Thymine (T)• Cystine (C)

Purines• Adenine (A)• Guanine (G)

Single-ring structure Double-ring structure

Differ only in the nitrogenous bases

Page 6: Nucleic Acids Into to DNA. Video

Nucleotides

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

Page 7: Nucleic Acids Into to DNA. Video

Nucleotides

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

Page 8: Nucleic Acids Into to DNA. Video

The Double Helix

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

Page 9: Nucleic Acids Into to DNA. Video

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

Page 10: Nucleic Acids Into to DNA. Video

Double Helix

• Purines bind with the pyrimidines– Adenine Thyamine A—T

– Guanine Cystosine G—C

Called complementary bases

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