BIOS41_Lecture7_01282008

BIOS41_Lecture7_01282008 - contains about 30,000 genes in a...

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BIOS 41 Biology Core I: Cellular and Molecular Spring 2008 Professor J. A. Sands Lecture 7, January 28 DNA and Chromosomes (Chapter 5)
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05_02_DNA.jpg DNA is made of four nucleotide building blocks .
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05_06_compl_pairs.jpg Base pairs in DNA
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05_07_base pairing.jpg A short section (four base pairs) of double helical DNA .
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05_08_major_minor_gr.jpg Space- filling model showing 1.5 turns of DNA double helix. Diameter = 2 nm Length of one complete turn of double helix (10 base pairs) = 3.4 nm
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05_13_chromo_banding.jpg Unique banding patterns allow the identification of each human chromosome. This set of chromosomes
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Unformatted text preview: contains about 30,000 genes in a total of about 3 billion base pairs of DNA. So, on average there are about 10 genes per million base pairs. 05_17_cell cycle.jpg Replication and segregation of chromosomes occur through an ordered series of stages, called the cell cycle . 05_20_less compact.jpg DNA in interphase is less compact than that in mitotic chromosomes. 05_22_8_histone.jpg Experimental analysis shows that nucleosomes contain DNA wrapped around a protein core of eight histone molecules . 05_24_Chromatin pack.jpg Chromatin packing occurs on several levels....
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This note was uploaded on 04/19/2008 for the course BIOS 41 taught by Professor Sands during the Spring '08 term at Lehigh University .

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BIOS41_Lecture7_01282008 - contains about 30,000 genes in a...

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