CELL - THE UNIT OF LIFE
1. Introduction to the Cell
Definition of a Cell:
A cell is the basic unit of life, capable of performing all the essential functions needed to sustain life.
From bacteria to humans, every living being is made up of cells.
Importance of Cells:
Cells provide structure to organisms, carry out metabolic activities, produce energy, and ensure
growth, repair, and reproduction. They are fundamental to understanding life and biological
processes.
2. Types of Cells
Prokaryotic Cells:
Do not have a nucleus or membrane-bound organelles (e.g., bacteria).
Eukaryotic Cells:
Have a well-defined nucleus and membrane-bound organelles (e.g., animal and plant cells).
3. Organelles and Their Functions
1. Cell Membrane
A thin, flexible outer covering that protects the cell.
It controls what enters and exits the cell, maintaining balance (homeostasis).
2. Nucleus
The control center of the cell containing DNA.
Regulates gene expression and cell activities like growth and reproduction.
1. Introduction to the Cell
Definition of a Cell:
A cell is the basic unit of life, capable of performing all the essential functions needed to sustain life.
From bacteria to humans, every living being is made up of cells.
Importance of Cells:
Cells provide structure to organisms, carry out metabolic activities, produce energy, and ensure
growth, repair, and reproduction. They are fundamental to understanding life and biological
processes.
2. Types of Cells
Prokaryotic Cells:
Do not have a nucleus or membrane-bound organelles (e.g., bacteria).
Eukaryotic Cells:
Have a well-defined nucleus and membrane-bound organelles (e.g., animal and plant cells).
3. Organelles and Their Functions
1. Cell Membrane
A thin, flexible outer covering that protects the cell.
It controls what enters and exits the cell, maintaining balance (homeostasis).
2. Nucleus
The control center of the cell containing DNA.
Regulates gene expression and cell activities like growth and reproduction.
