Protocells, Bacteria, Archaea Flashcards
Minimal requirements for protocells
Abiogenesis
Compartmentalization
Catalysis
Complexity
Self replication
Nucleic acids (compartmentalization?)
No. Fatty acids likely to have been abundant
Proteins (self-replication)
Cannot self-replicate
Ribozyme
RNA that catalyzes a chemical reaction
Cell theory
All living organisms are comprised of cells
The cell is the basic structural unit of life
Alls cells came from pre-existing cells (ie no spontaneous generation)
Gram + bacteria
Uniformly dense cell wall consisting primarily of peptidoglycan
Dyes blue
Gram - bacteria
Very thin peptidoglycan layer and outer membrane - together make up cell envelope
Prokaryotes
Bacteria
Archaea
“Before the nut”
Eukaryotes
Eukarya
Has nucleus
“Good nut”
Bacteria and Archea
Small typically ~1-2 um
No membrane bound organelles
Single circular chromosomes
Have cell walls
Peptidoglycan
Peptido - protein
Glycan - sugars
(ie carbohydrate)
Bacteria has this in their cell walls
Transcription/translation in bacteria
Transcription and translation are simultaneous
+ Fast
-no time for quality control (may lead to dysfunctional proteins)
