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level: 1.5 Origin of Cells

Questions and Answers List

level questions: 1.5 Origin of Cells

QuestionAnswer
what is abiogenesis?theory that living cells came from non living matter
What is a function of a cell?maintain an internal environment that is optimal for metabolic reaction such as self replication
4 stages of abiogenesis?non living synthesis of simple organic molecules assembled into complex polymers some polymers formed the ability to self replicate = inheritance packaged into membranes with a different internal chemistry to surroundings (protobionts)
What is the milley-urey experiment? (6)recreated the conditions of pre biotic earth with a closed system of flasks and tubes water boiled to vapor at high temps vapor mixed w gases in a reducing atmosphere (no oxygen) mixture exposed to electrical discharge (lightning as e source) cooled and left to condense condensed mixture had organic molecules
What is biogenesis theory? (3)conditions needed for non living synthesis of cells doesn't exist on modern earth = living cells can't come independently by abiogenesis bec cells can only be formed by dividing from pre existing cells from Pasteur
What was Pasteur's experiment for biogenesis? (4)broth was boiled to kill existing micro-organisms (Sterilize) as the broth cooled water collects this seals the mouth of flask = no growth if neck is broken, air carries microorganisms into broth= contamination
What is endosymbiosis? (2)a cell that lives inside another cell w mutual benefit euks are from pros vis endosymbiosis pros became engulfed and remained undigested =euk cell
evidence of endosymbiosis from mitochondria and chloroplasts? MAD DRMembranes = double membrane Antibiotics = can be influenced by certain antibiotics Division = reproduce in a fission like process DNA = have their own DNA (naked + circular) Ribosomes = have 70S ribosomes