Cell Structure and Function Notes PPT/PDF

 

Cell Structure
& Function

Cell
Theory

         
All
living things are made up of cells.

         
Cells
are the smallest working units of all living things.

         
All
cells come from preexisting cells through cell division.

         
The study of cells from its basic structure to
the functions of every cell organelle is called Cell Biology. Robert Hooke was
the first Biologist who discovered cells.

Definition
of Cell

A cell is
defined as the smallest, basic unit of life that is responsible for all of
life’s processes.

Characteristics
of Cells

·        
Provide structure and support to the body of an
organism.

·        
The cell interior is organised into different
individual organelles surrounded by a separate membrane.

·        
The nucleus (major organelle) holds genetic
information necessary for reproduction and cell growth.

·        
Every cell has one nucleus and membrane-bound
organelles in the cytoplasm.

·        
Mitochondria, a double membrane-bound organelle is
mainly responsible for the energy transactions vital for the survival of the
cell.

·        
Lysosomes digest unwanted materials in the cell.

·        
Endoplasmic reticulum plays a significant role in
the internal organisation of the cell by synthesising selective molecules and
processing, directing and sorting them to their appropriate locations.

Two
Types of Cells

1.      
Prokaryotic
(no nucleus)
                                            2. Eukaryotic (contains a nucleus)

Prokaryotic
Cell

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