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Title: How DNA in a prokaryote different from DNA in a eukaryote? Post by: Fittzi on Sep 7, 2012 How DNA in a prokaryote different from DNA in a eukaryote?
Title: How DNA in a prokaryote different from DNA in a eukaryote? Post by: rjedlicka on Sep 7, 2012 Prokaryotic cells:
Most primitive, earliest form of life Do not have a pre-defined nucleus Chromosomes are dispersed in the cytoplasm Contain no membrane-bound organelles Have circular chromosomes and lack histone proteins Most metabolically diverse Small - typically 0.2-2.0 micrometers in diameter Have a primitive cytosketetal structures or don't have a cytoskeleton at all Smaller (70S) ribosomes Don't undergo meiosis but reproduce sexually by the transfer of DNA fragments through conjugation Eukaryotic cells: More complex, evolved organsims Contain true nuclei in which chromosomes are compacted as chromatin Contain membrane-boundorganelles Have linear DNA and contain histone proteins Larger - typically 10-100 micrometers in diameter Have a complex cytosketeton Larger (80S) ribosom Reproduce sexually with the use of meiosis Title: How DNA in a prokaryote different from DNA in a eukaryote? Post by: Rkamu on Sep 7, 2012 Pro - Single DNA present.
Euk - Organelles also have their own DNA. Pro - It is short, simple and codes for few proteins. Euk - It is complex, longer and codes for large number of proteins. Pro - Not enclosed in nuclear envelope. Euk - DNA is enclosed in nuclear envelope. Pro - Circular DNA is present. Euk - Linear strand of DNA is present. Pro - DNA is not associated with proteins. Euk - DNA proteins are present. Pro - DNA replication starts at one point. Euk - DNA replication starts at multiple origins. Pro - Leaky genes are present on DNA. Euk - Methylation checks the leakage of genes in eukaryotes. Title: How DNA in a prokaryote different from DNA in a eukaryote? Post by: Five1s on Sep 7, 2012 Go with Alone Guy's list, but add this one:
Pro: Most DNA is coding or regulatory Euk: Most DNA has no known function and is probably junk |