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
mitochondria and chloroplasts; contains come of their own DNA, RNA, and ribosomes, reproduce in cells by fission, resemble free-living bacteria
produce chemical energy from sugars and other compounds
in plants and some protists, site for energy production from sunlight
theory for semi-autonomous organelles
organisms living together in direct and intimate contact
strands of chromosomes
sites of rRNA synthesis, assembly of large & small ribosomal subunits
active transport complex of many types of proteins
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