Science And Technollgy Part_1

Biology CELL

WHAT IS CELL?

All living organisms on earth are divided in pieces called cells. Cells are small compart-ments that hold all of the biological equipments necessary to keep organisms. Cells carry out all the basic functions of life: growth, metabolism and r e pr o- duct ion . There are someorganisms like amoeba consists of a single cell. This single cell increasein size and when it attains a certain size, it divides into two separates individuals. In case of multi cellular organisms, the cell also divides into two parts, but the two parts remaining joined this process is repeated crore of times so that body mass is built up. In this process some cells become specialized to perform specific functions but other retains their capacity for cell division throughout life.

WHO GAVE THE CELL THEORY?

The term cell was coined by Robert Hooke in 1665. In 1838 matthias schleiden, German botanist proposed the idea that all plants consists of cells. In 1839, The Eodor Schwann a German zoologist asserted that all plant and animals are made up of cells. This finding forms the basis of cell theory.

COMPONENTS OF CELL?

In the living organisms there are two types of cellular organizations. If we look at very simple organisms like bacteria and blue-green algae, We will discover cells that have no defined nucleus, these are prokaryotes cells. The cells which have definite nucleus are known as eukaryote. But the things which both have in common is that there are compartments surrounded by some type of membranes. These are called cell membranes.