________________
(E-2)
Definitions First of all let us refresh our memory about a few 'technical-words', used or required to be used in the following articles or investigations
Atom: Smallest unit of an element. It consists of a nucleus & electrons around it.
Bio-cell: It is the basic unit of our body part or tissue, containing a nucleus in the cell-wall.
Charge: like a magnet, electricity has two charges, positive and negative electric charge.
Covalent bond: Bonding of molecules is due to sharing of electrons between them, i.e. An electron orbits nuclei of both the atoms.
Chromosomes: These are located in the nucleus of a cell. These are made up of DNA & RNA. A human cell has 23 pairs of chromosomes. Each chromosome has a controlling and maintaining function for a specific part of the body.
DNA & RNA: These are chemical acids and have double helical thread-like structure in the chromosomes. They contain 4 types of chemical compounds called ACTG.
Gene: A portion of the above "thread” is called “gene". A gene carries a complete code of instructions required for a specific function of a part of the body.
Electron: It is the smallest, indivisible particle of the atom. It revolves around the nucleus of the atom and carries a unit negative charge.
Em-field: When current flows through a conductor, it is surrounded by a fielf of force, called electro-magnetic field.
Enzymes: These are proteins with a specific function. The life activity is connected with enzymes.
Es-field: static electric charge is always surrounded by an electrostatic field, e.g. TV-screens collect static-charge and exhibit Es-field. When we take our hand nearer to the screen, our hairs are raised.
Electro-vacancy: In the atomic structure, if the outer orbit contains less no. Of electrons then it could contain, it would have a vacancy for electrons.
Jain Education International
For Private & Personal Use Only
www.jainelibrary.org
