1)What is a cell membrane ?
2)differentiate between protaryotic cell and eukaryotic cell.
2)differentiate between protaryotic cell and eukaryotic cell.
1. The cell membrane, also known as the plasma membrane, is a double layer of lipids and proteins that surrounds a cell and separates the cytoplasm (the contents of the cell) from its surrounding environment. It is selectively permeable, which means that it only lets certain molecules enter and exit. It can also control the amount of some substances that go into or out of the cell. All cells have a cell membrane.
2 Prokaryotic Cell
Eukaryotic cell
Size is 0.1- 5.0 um
Size is 5-100 um
Nucleus is absent
Nucleus is present
Membrane bound nucleus absent.
Membrane bound Nucleus is present.
One chromosome is present, but not true chromosome plastids
More than one number of chromosomes is present.
Unicellular
Multicellular
Lysosomes and Peroxisomes absent
Lysosomes and Peroxisomes present
Microtubules absent
Microtubules present
Endoplasmic reticulum absent
Endoplasmic reticulum present
Mitochondria absent
Mitochondria present
Cytoskeleton absent
Cytoskeleton present
Ribosomes smaller
Ribosomes larger
Vesicles present
Vesicles present
Golgi apparatus absent
Golgi apparatus present
Chloroplasts absent; chlorophyll scattered in the cytoplasm
Chloroplasts present in plants
Submicroscopic in size Flagella is present made up of only one fibre
Microscopic in size, membrane bound
Cell wall chemically complexed
Cell wall is present in plants and fungi and chemically simpler
Vacuoles absent
Vacuoles absent
Permeability of Nuclear membrane is not present
Permeability of Nuclear membrane is selective
Sexual reproduction is absent
Sexual reproduction is present
Endocytosis and exocytosis are absent.
Endocytosis and exocytosis occurred
It may have pili and fimbriae.
Pili and fimbriae are absent
Transcription occurs in the cytoplasm
Transcription occurs inside the nucleus.
The cell membrane, also known as the plasma membrane, is a double layer of lipids and proteins that surrounds a cell and separates the cytoplasm (the contents of the cell) from its surrounding environment. It is selectively permeable, which means that it only lets certain molecules enter and exit. It can also control the amount of some substances that go into or out of the cell. All cells have a cell membrane.
2| Prokaryotic Cell | Eukaryotic cell |
| Size is 0.1- 5.0 um | Size is 5-100 um |
| Nucleus is absent | Nucleus is present |
| Membrane bound nucleus absent. | Membrane bound Nucleus is present. |
| One chromosome is present, but not true chromosome plastids | More than one number of chromosomes is present. |
| Unicellular | Multicellular |
| Lysosomes and Peroxisomes absent | Lysosomes and Peroxisomes present |
| Microtubules absent | Microtubules present |
| Endoplasmic reticulum absent | Endoplasmic reticulum present |
| Mitochondria absent | Mitochondria present |
| Cytoskeleton absent | Cytoskeleton present |
| Ribosomes smaller | Ribosomes larger |
| Vesicles present | Vesicles present |
| Golgi apparatus absent | Golgi apparatus present |
| Chloroplasts absent; chlorophyll scattered in the cytoplasm | Chloroplasts present in plants |
| Submicroscopic in size Flagella is present made up of only one fibre | Microscopic in size, membrane bound |
| Cell wall chemically complexed | Cell wall is present in plants and fungi and chemically simpler |
| Vacuoles absent | Vacuoles absent |
| Permeability of Nuclear membrane is not present | Permeability of Nuclear membrane is selective |
| Sexual reproduction is absent | Sexual reproduction is present |
| Endocytosis and exocytosis are absent. | Endocytosis and exocytosis occurred |
| It may have pili and fimbriae. | Pili and fimbriae are absent |
| Transcription occurs in the cytoplasm | Transcription occurs inside the nucleus. |
