-Evolved earlier than Eukaryotic cells.
-Smaller and simpler than Eukaryotic cells as don't have a nucleus/membrane-bound organelles.
~70s Ribosomes, Slime Capsule, nucleoid, cell wall, cell membrane, mesosomes, plasmids, flagella

CYTOPLASM
~[S] No membrane bound organelles, Contains dissolved substances and enzymes.
~[F] Cytoskeleton=present, but composed of diff proteins than Eukaryotic cytoskeleton.

Ribosomes
~[S] Smaller 70s Ribosomes
~[F] Synthesise proteins.

Circular DNA
~[S] Single molecule of circular DNA, NOT ASSOCIATED with Histone proteins, Located in the Nucleoid, No Nucleus.
~[F] Contains the genetic information for the replication of bacterial cells.

Cell Wall
~[S] Made of Murein (peptidoglycan), polymer of polysaccharides and peptides (glycoproteins).
~[F] Physical Barrier that Excludes certain substances. Protects against: Mechanical Damage, Osmotic lysis.

Plasmid
~[S] Small, circular, double-stranded DNA molecules found in the cytoplasm. Separate from main DNA strand.
~[F] Contain genes which may aid the survival of bacteria in adverse conditions, e.g. produce enzymes which break down enzymes. These genes=passed from one bacterial cell to another during conjugation, where bacterial cells exchange genes.

Capsule
~[S] Mucilaginous slime layer.
protects bacteria from other cells
helps groups of bacteria stick together for protection
prevents the cell from drying out.

flagellum
Composed of a protein: tubulin
Diff interna; structure to flagella in Eukaryotes

Cell surface membrane:

Pili
shorter and straighter than flagella. HAIR LIKE STRUCTURES

Some bacteria have one or more flagella
used to move cells (motile)

	Criado por Abdul Raja mais de 8 anos atrás

AS BIO :D

Prokaryotic Cells.