Microbial Growth Flashcards
Macronutrients
what cells require in large amounts
what do they require in large amount ?
- Carbon
- Nitrogen
- Hydrogen
- Oxygen
- Phosphorus
- Sulfur
- Potassium
- Magnesium
- Calcium
- Sodium
Micronutrients
what they require in trace amounts
what they require in trace amounts
-Iron: Fe2+, Fe3+
– Trace metals
Growth factors,they require?
-Vitamins
-Amino acids
-purines
-pyrimidines
other
why do they require that
can’t synthesize them
Some growth factors are the by‐product or waste
of another microorganisms
Growth of the population: increase?
number of cells or biomass.
Most prokaryotes multiply by
binary
fission
the cell grows in size until it
forms a partition (septum)
a partition (septum) that constricts the cells into
2 daughter
cells
Each daughter cell receives
-one copy
of the chromosome, ——sufficient
ribosomes, ——macromolecules,
monomers and other m
the generation time depends?
on the bacteria it’s not always the same
e.g E-coli?
20 min in lab
Cell division requires synthesis of ?
a new cell wall material
but before that it requires his destruction by
autolysins
By what are transported the peptidoglycan subunit across the cytoplasmic membrane ?
Bactoprenol
the division ring?
FtsZ ring
What does the autolysins create at the division ring?
create some gaps in the peptidoglycan
These gaps allow?
rearrangement of the
peptidoglycan and synthesis of a
new cell wall
What are wall bands?
scar between old and
new peptidoglycan
is it only a mechanisme in bacteria,eukaryotes?
no also in Archaea that have a cell wall
