Evolution of the cell, Biology

EVOLUTION OF THE CELL

All the living organisms are made up of cells. A living cell may be defined as a compartment enclosed by a membrane that consists of several chemical constituents and is capable of propagating itself by division. Activity of an organism is dependent on the activities of its cells, individually and collectively. Basic structures and functions are common in all cells with certain differences according to their specific needs. As you have already studied in Unit 12 of the Foundation Course in Science and Technology, there are two stages in evolution of the cell; chemical evolution and biological evolution. Chemical evolution started with the formation of organic molecules on the earth which had no life until then. We call it pre-biotic earth. Some of these early molecules developed the ability of producing an exact copy of their own self by self-replication. We can mark this event as the origin of life. Later on, during the course of biological evolution, molecular aggregates organized and formed the cell which was different from the cell as it exists today. We shall trace these events which are based partly on speculation and partly on experimental evidence.

Posted Date: 12/8/2012 7:39:36 AM | Location : United States







Related Discussions:- Evolution of the cell, Assignment Help, Ask Question on Evolution of the cell, Get Answer, Expert's Help, Evolution of the cell Discussions

Write discussion on Evolution of the cell
Your posts are moderated
Related Questions
Give three examples of reflex actions. Examples of reflex actions are alter in size of the pupil of the eye in response to light intensity, blinking in response to foreign par

Define Renal Function & cardiovascular - change related with ageing? Changes associated with the cardiovascular and renal function: The progressive accumulation of athermanous

character & classfication of phylum analys

DIGESTION Digestive enzymes break down food particles into smaller units. You will seeĀ  that the final breakdown products of protein digestion are single amino acids or small c

Q. What is the difference between carriers of HIV and AIDS patients? A person be able to be a carrier of the HIV without necessarily being affected by the immunodeficiency synd

Define the first step to envision the pattern of deformation. The first step in the analysis is to envision the pattern of deformation that would accompany such a failure. In t

How different are oxyhemoglobin and hemoglobin? Where is it expected to find a higher concentration of oxyhemoglobin, in peripheral tissues or in the lungs? Oxygen-bound hemogl

what is hydrostatic skeleton?

The plasma membrane consists mainly of: 1. Phospholipids embedded in a protein bilayer 2. Proteins embedded in a phospholipid bilayer 3. Proteins embedded in a polymer of

Open or Blunderbuss Apex or divergent roots The mechanical cleaning & shaping of teeth with blunderbuss canal apex are very difficult if not impossibly orthogratly due to 1