| 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 DR | Membranes = 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 |
