cell the basic unit of life

Introduction to cell biology:

Cell is the basic component of human life. All life processes owe because only of cell and its activities.

The biological sciences based on cell theory which states as

Ø  All cells exist from pre-existing cells.

Ø  Cell is the basic structural and functional unit of life.

Ø  All living organisms are made up of one or more cells.

So here we will discuss about animal cell in detail and about its organelles.

First of all I will briefly explain here the animal cell and from which it is made up of.

Ø Glyoxysomes

Ø  Cell membrane

Ø  Cytoplasm

Ø  Centrosomes

Ø  Mitotic apparatus

Ø  Lysosomes

Ø  Flagella

Ø  Nucleus

Ø  Vacuoles

Ø  Storage products

We will discuss one by one all these in our next section

Types of cell:

There are two types of cell present in organisms.

Ø  Eukaryotic cell

Ø  Prokaryotic cell

The organisms containing prokaryotic cells are known as prokaryotes.

The organisms containing eukaryotic cells are known as eukaryotes.

Eukaryotic cell is more complex and advanced form of cell. Prokaryotic cell is old and predominant type of cell that was found in bacteria in the past. Here we will discuss that what things or features defines an eukaryotic cell and one by one we will go through all the details of organelles found in the eukaryotic cell. Following is the brief summary of structures found in the eukaryotic cell.

·         Well defined nucleus:

·         DNA which is present in nucleus. It is of linear type.

·         Membrane bounded organelles are present

·         Ribosomes which are large(80 S)

·         Cytoskeleton

·         Cell wall which is made up of cellulose or chitin.

·         Cell membrane in which sterols are present

·         Cell division is by mitosis or meiosis.

·         Histone proteins are present

·         Flagellum is present having composition tubulin protein.

·         Example include animal and plant cell.