Lecture11bio

Lecture11bio - BIOLOGY 1001 Monday, February 25, 2008...

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BIOLOGY 1001 Monday, February 25, 2008 Lecture 11 Chapter 9 DNA: the molecule of heredity How Did Scientists Discover That Genes Are Made of DNA? Griffith Discovers Transformation Figure 9-1 What is the transforming material? Treated cell extracts with protein, carbohydrate, RNA, and DNA digesting enzymes. Only cell extracts treated with DNA-digesting enzymes lost their transforming ability. DNA transforms bacteria. Nucleotide Bases in DNA Nucleotides contain a phosphate, deoxyribose sugar, and N- Containing base. Page 151 A Nucleotide Strand Always assembled from the P end to the S end. Covalent bond between the sugar of one nucleotide and the phosphate of a second. Clicker Question: What is the complement of this nucleic acid strand? (AGCTG) Answer: TCGAC Watson-Crick Model of DNA Structure
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Base Pairing in DNA Chargaff’s Rule A=T C=G 2 Hydrogen Bonds
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Lecture11bio - BIOLOGY 1001 Monday, February 25, 2008...

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