Cell Structure - Prokaryotes Flashcards
which structures are always present in prokaryotic cells (7)
cytoskeleton (simple)
cytoplasm
ribosomes
cell wall
plasma membrane
nucleoid
circular DNA
which structures are sometimes present in prokaryotic cells
flagellum
infolding on plasma membrane
mesosome
plasmid
capsule
pili
what is the cell wall in prokaryotes made of
cross-linked peptidoglycan
what is the nucleoid
area where DNA is found
what is the purpose of the flagellum
movement
what is the purpose of the infolding of plasma membrane
may form a photosynthetic membrane or carry out nitrogen fixation
what is the purpose of the mesosome
associated with DNA during cell division, helps with formation of new cell walls, site of aerobic respiration
what is the purpose of the plasmid
can confer antibiotic resistance
what is the purpose of the pili
for attachment to other cells or surfaces, involved in sexual reproduction
what is the size of prokaryotes
1-5micrometres
what are the sizes of eukaryotic cells
10-40 micrometres (animal)
40-100micrometres (plant)
are there mitochondria and chloroplasts in prokaryotes
no
what size of ribosomes are present in prokaryotes
70S
is the DNA in prokaryotes associated with histones
no. unlike in eukaryotes
do the flagella in prokaryotes have microtubules
no
