Biology 1001A Lecture Notes - Endoplasmic Reticulum, Homochirality, Extremophile
9 Jul 2013
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4. 6 bya old age of start of life on earth. Bacteria, archaea, eukaryotes characterisitics of luca although we have luca (last universal common ancestor), it doesn"t mean that life started form one form. Before, prokaryotes consisted of the bactera and archaea put together; however, this is nonsense b/c bac and arch are not related. Archaea and eukaryotes are much more closely related!!!! Pro means anteriority, although there is no evidence that prok came before euk! Also, prok suggest directionality (simple to complex) although this is not nec how evolution works. reductive evolution explanation for rise of bacteria and archaea. It is possible that luca was a proto-euk. So, it is also possible that bacteria and archaea streamlined themselves; this means that they got rid of endoplasmic reticulum, nuc envelope, etc. Now, bacteria have much faster rates of reprod. And both bac and arch can be extremophiles. advantages of evolutionary simplification (streamlining). leaner, meaner fighting machines relationship between homochirality and life.
