|alshinawy||التاريخ: الثلاثاء, 2013-03-12, 12:45 PM | رسالة # 1|
|The Cell: It is the building unit of the body of the living organism. |
Or It is the unit of structure and function in the living organism.
There are two kinds of cells:
1- Plant cell 2- Animal cell
* (1) The plant Cell *
The plant cell consists of:
1- Cell wall 2- Plasma membrane
3- Cytoplasm 4- Nucleus
5- Plastids (chloroplast) 6- Sap Vacuole
* (2) The Animal Cell*
The animal cell consists of:
1- Plasma Membrane 2- Cytoplasm
3- Nucleus 4- Small vacuoles
* Compare between animal and plant cell
Points of comparison Plant cell Animal cell
1- Cell wall
2- Cell membrane
All cells are units contain:
1- Nucleus: organizes the biological operations inside the cell and it is in charge of cell division.
2-Cytoplasm: Fill the space and biological operation are acted by it.
3- Plasma Membrane: surrounds the cell and controls the substances entering into the cell or leaving it.
* Unicellular organisms:
There are a lot of unicellular micro-organisms around us which can't be seen by the naked eyeالعين المجردة such as bacteria and yeast.
* Its structureتركيبه:
Consists of nucleus, cytoplasm and a wall that determines the cell shape.
* Economic importanceالأهمية الاقتصادية of Yeast fungus:
1. Making bread. 2. Making alcoholصناعة الكحول.