= the vehicle for transmission of genetic info in all organism
Theory by MJ Schleiden & T Schwann 1839
composed of 1/> cells
Exist before
Vital function
contain Hereditary info
Characteristic
Self-contained & Self-maintening
Need nutrient
nutrient --> energy
Specialized function
Reproduce
Stores its own activity instruction
Use protein as catalyst
Amino acids bind and act as enzyme
Enclosed in plasma membrane across which
nutrient & waste materials must pass
DNA
Components
4 nucleotides : A,C,T,G
A <-> T, C <-> G
Deoxyribose
Phosphat compound
Structure
Double helix
Herited
RNA translation
PROCES ???
Prokaryotes
Cell Structure
Flagella
= long, slender projection composed of
microtubule, serve to propel the cell
Types
Monotrichous
Peritrichous
Amphitrichous
Lophotrichous
Cell Wall
= a fairly rigid layer surrounding the cell
provide structural support, protection, filtering
CLASSES
Gram-negative
inner membralikan -> periplasmic space ->
peptidoglycan -> outer membrane -> porin protein -> LPS
Gram-positive
inner membrane -> peptidoglycan -> teichoic acid
Cell capsule
= layer outside cell wall composed of polysaccharides
serve to protect bacteria from phagoctosis
PLasma membrane
= composed of protein & phospholipid, serve as permeability
barrier, enzyme, transport solutes, energy generation
(combined mitochondria), DNA anchoring, chromatid separation
Pili
= composed of
protein, for DNA
transfer during
conjugation