Bacterial growth Flashcards
how do bacteria reproduce and what do they create
asexually by binary fission
create two genetically identical cells
why do bacteria need an optimum temperature and pH to grow in
optimum enzyme activity
increases rate of reaction and growth
what do bacteria need an optimum oxygen concentration (or no oxygen if bacteria are anaerobic) to grow in
for aerobic respiration to release energy for growth
why do bacteria need an optimum concentration of glucose and nitrogen to grow in
glucose is used for respiration to release energy
nitrogen is used to make amino acids to make proteins for growth and to make RNA
why do bacteria need moisture/water for growth
for ell functions e.g. hydrolysis
define generation time
how long it takes between new cells forming and cell division
what are the four phases in order of the growth of bacterial culture
lag phase
log phase
stationary phase
death phase
what occurs during the lag phase during the growth of bacterial culture
no increase in number of cells
cells adjust to the conditions
what occurs during the log phase during the growth of bacterial culture
number of cells increases
cells divide at the fastest rate possible for the conditions - doubling each time
what occurs during the stationary phase during the growth of bacterial culture
no increase in number of cells
glucose is depleted
waste products build up
change in pH
what occurs during the death phase during the growth of bacterial culture
number of cells decreases
number of cells dying is greater than number of new cells formed
