MCB 2210 Lecture 3: MCB 2210.001 (1-23-2015)
3 Apr 2016
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Announcements: on the fridays that we have an exam, there will be no lecture. Best evidence suggests that there"s a common ancestry for all living organisms on. Earth: because the fundamental processes in organisms are similar, come from a common cell , closely related species have similar sequences in their genes for a particular trait, whereas species that aren"t related are more different in the sequences. Best guess for how the first cell arose: a soup of organic molecules were created abiotically, rna: genetic material that has both catalytic (like proteins) and information encoding (like dna) capabilities. Because it could do both, it was probably the first polynucleotide formed. Its role has changed since the evolution of dna as the storage medium for info and proteins as the catalytic molecules. It"s an intermediary between the two: prokaryotes arose first because they are simpler. They are more complex thus need more genes. So nucleus evolved to keep track of larger genome.
