BIO SCI 97 Chapter Notes -Interphase, Plos Biology, Mitosis
30 Jan 2014
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The exon shuffle model works because introns do not code for protein and do not have a reading frame. Bacteria: bacterial chromosomes are densely packed to form a small region called the nucleoid, two features allow dna compaction, proteins help organize the dna into a series of tight loops, the circular dna undergoes supercoiling. Bacteria isn"t isn"t relaxed but is supercoil and helps pack dna into a limited region. Depending on which way you wound the dna in it is either positive or negative. Dna forms into small loops bounded by smc proteins and then they are formed into larger loops. Smc structural maintenance of chromosome proteins bind dna. More dna per cell in eukaryotes than bacteria. Same sort of process super coiling and binding proteins. A eukaryotic chromosome has one dna double helix, associated with a diverse array of proteins. The dna and associated proteins of a chromosome are called chromatin.
