MGY377H1- Final Exam Guide - Comprehensive Notes for the exam ( 90 pages long!)

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Bacteria cells range from 1-2 microns in size. This tree is generated by looking at the ribosomal rna and it maps them based on the rrna relatedness. The blue box is everything we can see with the naked eye. We are far more related to corn than ecoli is to another bacteria. At the molecular level, the genetic diversity between bacteria is immense. Viruses are (cid:1005)(cid:1004) fold (cid:373)ore a(cid:271)u(cid:374)da(cid:374)t tha(cid:374) (cid:271)a(cid:272)teria. These (cid:448)iruses do(cid:374)"t i(cid:374)fe(cid:272)t hu(cid:373)a(cid:374)s, the(cid:455) i(cid:374)fe(cid:272)t bacteria, they are bacteriophages. In terms of biomass, trees are the do(cid:373)i(cid:374)a(cid:374)t for(cid:373) of (cid:271)io(cid:373)ass. Theres 10x more bacteria cells than humans cells in them. The earliest members of microbial life are the protobacteria. 4 billion years ago, we see evidence in the fossil record not because we can see little dots, but because of the effect on the dead environment. When earth cooled, there was no free molecular oxygen, the world had no oxygen in its atmosphere for a long time.