BIOL 112 Lecture Notes - Lecture 2: Peptide, Symbiogenesis, Cell Theory

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11 Sep 2018
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Cell theory - cell is the fund6ment6l unit of life th6t m6de up org6nisms 6nd come from pre-existing cells. An org6nism c6n be m6de up of one or multiple cells. Different cells c6n h6ve both different sh6pes 6nd sizes. Cell functions: store 6nd tr6nsmit inform6tion - dna stores inform6tion, replic6te (i) tr6nscription: synthesis of rna from 6 dna templ6te. Endosymbiotic theory - all cells 6re thought to h6ve evolved from 6n univers6l. 6ncestor cell some org6nelles in euk6ryotic cells resemble engulfed prok6ryotic cells (endosymbionts) e. g. chloropl6st 6nd mitochondri6 h6ve double membr6nes, multiply by bin6ry fission, circul6r dna. Q. st6y sm6ll ch6nge sh6pe incre6se surf6ce 6re rel6tive to volume. e. g. long & thin, microvilli comp6rtment6lize e. g. chloropl6st for photosynthesis, nucleus for replic6tion & tr6nscription, mitochondri6 for respir6tion. Molecules movement e. g. cytopl6smic stre6ming in pl6nts where 6ctin-myosin inter6ction move cytopl6sm 6round cell.

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