Season 1: Of Genes and Germs Episode 2: DNA Structure

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Presentation transcript:

Season 1: Of Genes and Germs Episode 2: DNA Structure Series: Genetics Season 1: Of Genes and Germs Episode 2: DNA Structure Objective: Create a model to show the basic structure of a DNA molecule Bell Ringer: get out your notebook and signed syllabus

Watson and Crick determined the 3-D structure of DNA.

Watson and Crick determined the 3-D structure of DNA. They realized that DNA is a double helix

Watson and Crick determined the 3-D structure of DNA. They realized that DNA is a double helix backbone on the outside

Watson and Crick determined the 3-D structure of DNA. They realized that DNA is a double helix backbone on the outside bases on the inside.

DNA is composed of nucleotides.

DNA is composed of nucleotides. Each nucleotide has three parts.

DNA is composed of nucleotides. Each nucleotide has three parts. a phosphate group

DNA is composed of nucleotides. Each nucleotide has three parts. a phosphate group a deoxyribose sugar

DNA is composed of nucleotides. Each nucleotide has three parts. a phosphate group a deoxyribose sugar a nitrogen-containing base

The nitrogen containing bases are the only difference in the four nucleotides.

Nucleotides always pair in the same way.

Nucleotides always pair in the same way. Chargaff's Rule:

Nucleotides always pair in the same way. Chargaff's Rule: A pairs with T

Nucleotides always pair in the same way. Chargaff's Rule: A pairs with T C pairs with G

Nucleotides always pair in the same way. Chargaff's Rule: A pairs with T C pairs with G

DNA Model Activity Follow the instructions on the packet Due by end of class

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