BIOLOGY 1M03 Lecture Notes - Lecture 1: Alternative Hypothesis, Paramecium, Progenitor Cell
8 Jan 2017
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Thursday january 5th lecture- chapter 1: biology and the tree of life. Key developments: cell theory and the theory of evolution by natural selection. Both these developments are unified by the concepts of ancestry and descent. Evolutionary relationships among species and among cells can be represented by phylogenetic trees. Ho(cid:449) does o(cid:374)e (cid:862)do (cid:271)iolog(cid:455)(cid:863) (cid:271)(cid:455) aski(cid:374)g (cid:395)uestio(cid:374)s, ge(cid:374)e(cid:396)ati(cid:374)g h(cid:455)pothesises a(cid:374)d p(cid:396)edi(cid:272)tio(cid:374)s, and conduct experiments to test them. Biolog(cid:455) is the stud(cid:455) of life(cid:396); (cid:271)ut (cid:449)hat is life(cid:863) Living organisms share these five characteristics (among others) They are made up of one or more membrane-bound units called cells making them either prokaryotic or eukaryotic. They store and process information that is heritable dna and/or rna. They replicate (meaning that they reproduce-sexually or asexually) As populations, they evolve (meaning they change over time) A cell is a highly organized compartment bounded by a plasma membrane (or in some cases a cell wall) that contains concentrated chemicals in an aqueous solution.
