Lecture 15 Self-replicating molecules

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RNA world hypothesis

the idea that RNA systems self-replicated in previous ages and evolved into the current genetic duplication processes we have now

chemical natural selection

ribosome replication not accurate, select for ribosome variants that are better at linking nucleotides

Semi-autonomous organelles

mitochondria and chloroplasts; contains come of their own DNA, RNA, and ribosomes, reproduce in cells by fission, resemble free-living bacteria

Mitochondria

produce chemical energy from sugars and other compounds

chloropasts

in plants and some protists, site for energy production from sunlight

endosymbiont

theory for semi-autonomous organelles

symbiosis

organisms living together in direct and intimate contact

chromatin

strands of chromosomes

nucleolus

sites of rRNA synthesis, assembly of large & small ribosomal subunits

nuclear pore

active transport complex of many types of proteins

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