BIO 141: Life over time and mass extinctions

Bacteria

no nucleus

membranes composed of unbranched fatty acids attached to glycerol by ester linkages

cell wall contains peptiddoglycan

unique rRNA

Archaea

no nucleus

membranes composed of branched hydrocarbon chains attached to glycerol by ether linkages

cell wall contains no peptidoglycan

unique rRNA

Eucarya

nucleus

membranes composed of unbranched fatty acids attached to glycerol by ester linkages

if cell wall present, contains no peptidoglycan

unique rRNA

t or f Bacteria and Eukarya have the same hydrocarbon chains

true

t or f bacteria and archaea can form a monophyletic group

false

formation of planet earth

4.6 billon years ago

first oceans and continents

4.4 billion years ago

first evidence of life

happened after first oceans and continents

rise of atmospheric oxygen

appeared after evidence of life

first eukaryote

appeared after oxygen

first animals

after eukaryote

first land plant

after animals

animals move to land

after land plant

evidence of dino

after animals move to land

permo-triassic mass extinction

after dino

first mammal

after mass extinction

opening of atlantic ocean

after mammal

extinction of dinos

after opening of atlantic ocean

rise of himalayan mountains

after extinction of dinos

first human

after mountains

extinction of wooly mammoths

after first humans