Biology

Introduction of cell

What is cell?

The cell (from Latin cella, meaning "small room") is the basic structural, functional, and biological unit of all known living organism. Cells are the smallest unit of life that can replicate independently, and are often called the "building blocks of life". The study of cells is called cell biology.

Cell Theory

The three tenets to the cell theory are as described below:

  1. All living organisms are composed of one or more cells.
  2. The cell is the most basic unit of life.
  3. All cells arise from pre-existing, living cells.

History of microscope

The first microscope to be developed was the optical microscope, although the original inventor is not easy to identify. Evidence points to the first compound microscope appearing in the Netherlands in the late 1500s, probably an invention of eyeglass makers there: Hans Lippershay (who developed an early telescope) and Zacharias Janssen(also claimed as the inventor of the telescope). There are other claims that the microscope and the telescope were invented by Roger Bacon in the 1200s, but this is not substantiated. Giovanni Faber coined the name microscope for Galileo Galilei' s compound microscope in 1625 (Galileo had called it the "occhiolino" or "little eye").
The Inner Life of the Cell

Discussion

Describe your personal impression on cell. Share your opinions with your classmates. Have a short speech in your group on the topic which you are interested in.