evolution of cell

when something lives inside another thing symbiotically organism eats another organism but its not fully digested it can layer leading theory for origin of euk

The host eats the endosymbiot. The endosym reproduces inside Then the host divides and takes some of the endosym with it in each divide

All things are made of cells Cells are basic unit of struct for living things Cell have hereditary info that is passed on All cells come from preexisting cells - this one is not highlighted in the slids so maybe not as important?

DNA-> RNA-> protein 1 Replication - existing DNA become new Dna 2 transcription - new DNA makes new RNA, transcribes 3 Translation - RAN makes new proteins

Wanted to see if in hadean conditions and inorganic things could become organic things showed abiogenesis

Top down - RNA and Ribosome came first - We know that the simplest forms of life are RNA based, so lets start there - all life now has ribosomes Bottom up - chemical chimera - Look at probability and stability and see if other things are more likely - In a computational model if you have RNA, DNA building blocks you get a more stable and realistic premise - Its a hybrid molec of RNA and DNA supported by recent research

everything living now has ribosomes, found across all domains Pure RNA can arrive abiogenetically RNA can be genetic mat but also catalyst to make DNA, it’s a stepping stone

primary - when something eats another thing that stays alive inside secondary - when the thing that has a thing inside gets eaten by another thing, likely origin of euk

protoeuk eats cyanobacterium, becomes plastid once it is integrated in, that is primary endosym one of the vesicle wall surrounding the plastid is lost first protoeuk is eaten by a bigger thing, that is secondary endosym the first protoeuk becomes a plastid and has a vestigial nucleus the inner ones lose genes

Early cells may have started as something with virus-like genetic elements? possible that it replicated like a retrovirus?