|
Title: Provide evidence to substantiate the hypothesis that eukaryotic cells evolved fr Post by: colleen on Apr 11, 2012 Provide evidence to substantiate the hypothesis that eukaryotic cells evolved from prokaryotic cells.
Title: Re: Provide evidence to substantiate the hypothesis that eukaryotic cells evolved fr Post by: CEPA on Apr 11, 2012 One theory is the Endosymbiont Hypothesis which is: Two bacteria (both prokaryote) were in the presence of each other. One was either engulfed or invaded the cell. In both cases, the prokaryote had its DNA put into the DNA of the bacteria and then new new generations had the new organelle as well.
Five supporting evidences for the Endosymbiont Hypothesis: MITOCHONDRIA and CHLOROPLASTS · have two membranes · have their own DNA in the form of a circular chromosome · have their own ribosomes · have ribosomes are more similar to bacterial than eukaryotic ribosomes. · reproduce themselves when the cell divides (Nuclear DNA does not have recipe for mitochondria or chloroplasts) Title: Re: Provide evidence to substantiate the hypothesis that eukaryotic cells evolved fr Post by: colleen on Apr 11, 2012 Wow that was quick! Marking solved :D
|