cell theory: The scientific theory that all living organisms are made of cells as the smallest functional unit.
The cell theory includes three main ideas:
All living things are made of cells.
A cell is the smallest unit of life.
All new cells arise from existing cells.
Organisims that are made up of a single cell are said to be unicellular, some examples are bacteria, amoeba and paramecium.
While cells that are made up of many cells are multicellular, some examples are plant , animal and fungi.
Some cells are prokaryotic, which means their genetic material e.g DNA, lies freely in the cytoplasm and they do not have membrane bound organelles such as nucleus mitochondria or chloroplast.
Some cells are Eukaryotic, which means their genetic material e.g DNA, is surounded by a Nuclear membrane and they have membrane bound organelles. Most eukaryotic cells are multicellular.
label the bacteria
A) genetic material-large loop of DNA
B) pili
C) ribosomes
D) food granule
E) prokaryotic flagellum
F) plasmid DNA
G) cytoplasm
H) plasma membrane
I) cell wall
J) capsule or smile layer
Prokaryotes :
lack complex membrane boundorganelles such as mitochondria, chloroplast and ER.
Have ribosomes (70 s), but these are smaller than in eukaryotes.
Ribosomes are always free in the cytoplasm rather than attached to membranes.
Cell wall is made up of peptidoglycan (murein)
It is a large molecule that Contains amino acids and sugars
Capsule- protection against immune systemSecreted slime
