Prokaryotic metabolism Flashcards
photoautotroph
cells that gain energy from the sun and carbon from CO2
chemoautotrph
cells that gain energy from inorganic molecules and carbon from CO2
photoheterotroph
cells that gain energy from the sun and carbon from organic sources
chemoheterotroph
cells that gain both energy and carbon from organic sources
cell fission
the process of reproduction used by prokaryotic cells where first DNA is replicated then the cell elongates then it splits
describe cell population growth over time
initially there is a lag phase caused by cells needing to adapt to new conditions, then cell population grows exponentially before it steadies out and eventually begins to decline
MGT
mean generation time, the time taken for a cell population to double
Aerobics
cells that require oxygen for respiration
obligate anaerobes
cells that respire anaerobically and are killed by oxygen
facultative anaerobes
cells that respire aerobically or anaerobically
microaerophiles
require low oxygen levels (5-10%)
aerotolerant anaerobes
respire anaerobically but aren’t affected by O2 levels
Respiration
using a external electron acceptor to oxidize substrates completely to CO2
lithotrophes
cells that use inorganic substrates as electron acceptors
organotrophes
cells that use organic substrates as electron acceptors
