Chapter 7.1, Problem 4MI

Summary Introduction

To determine:

Three main ideas of cell theory.

Introduction:

The cell theory expresses that all natural living beings are made out of cells; cells are the unit of life and all life originate from prior life. In early nineteenth century, two researchers, M. Schleiden in 1838 and T. Schwann in 1839 set up the cell hypothesis and said that the cell is the essential unit of life.

Explanation of Solution

The cell theory is so settled today that it structures one of the binding together standards of science.

The three ideas of cell theory is:

1. All organisms are composed of one or more cells

It says that all living being on this planet are composed of cell either unicellular or multicellular. The unicellular organisms have a single cell while the multicellular organisms have more than one cell. Higher multicellular organism have different type of cells in a single body. Example: Human being who have liver cell, nerve cell, blood cells, etc.

2. The cell is the basic unit of life of an organisms.

The cell is the basic unit of an organisms as cell itself a complete organism for some species.

Example: Bacteria

3. All cells arise from the previous cells.

Nucleus which is the brain of cell and also contain the hereditary material divides the parent cell into two daughter cells via cell division. It shows that all cells arise from the pre-existing cells. There are different mode of division in prokaryotes and eukaryotes.