BIOLOGY 1A03 Lecture Notes - Lecture 4: Dna Supercoil, Streptococcus, Phosphodiester Bond

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BIOLOGY 1A03 Full Course Notes
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BIOLOGY 1A03 Full Course Notes
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Identify dna as the hereditary molecule in the cell. Describe the structure and function of rna. The dna of bacteria is contained in a circular chromosome, folded into many loops. Bacteria often have small circles of additional dna called plasmids. Bacteria have both a plasma membrane and a cell wall. In e. coli, the nucleoid consists of about 100 loops, each with about 50 kb of negatively supercoiled dna. When the dna in a loop unwind and the dna duplex forms a relaxed double helix. This supercoiling preserves the double helix structure and compacts the dna. Over 400 bacterial strains have been completely sequenced as of 2013 into a small space. Streptococcus, strings of spheroidal or coccoidal bacteria. Heat-killed bacteria is dead and therefore no longer harmful: observations, s-strain virulent bacteria = mouse dies of pneumonia, r-strain nonvirulent bacteria = mouse remains healthy, killed virulent bacteria = mouse remains healthy.

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