interaction activity

It is an active association between the individuals of same species for mutual benefits, also called as social organisat..

Activation of Adaptive Immunity - Antigens are processed by antigen presenting cells like macrophages. The processed antigen is presented on the surface of these cells. A group of T-cells called T helper cells specifically interacts with the presented antigen and becomes ac..

It is an intraspecific cooperative interaction, in which activity of an individual is influenced by some behaviour of another individual. It is a means of exchange of information among the members of the species. Informatory signals may be visual, auditory, chemical and tacti..

B and T lymphocytes have specific receptors on their surface. In B cells, this receptor is the antibody produced by that cell. When this receptor interacts with the antigenic determinant specific to it, the B lymphocyte becomes activated and divides to form a clone of cell..

Clonal Selection - B and T lymphocytes have specific receptors on their surface. In B cells, this receptor is the antibody produced by that cell. When this receptor interacts with the antigenic determinant specific to it, the B lymphocyte becomes activated and divides to form a ..

Two German biologists M.J.Schleiden (1838) and Theodore Schwann (1839) proposed the cell theory (or cell doctrine), which unified the ideas prevailing at that period on the organisation in plants and animals. The cell theory states that All living organisms are composed of minute structures called ..

It was suggested by Emil Fischer in 1894. According to this view, the enzyme molecule operates by chemically uniting with the substrate molecule, forming an enzyme-substrate complex. The enzyme molecule provides a uniquely structured template on which the substrate molecules can become attached an..

) Enzymes bind the substrate by multiple weak interactions. These weak interactions are electrostatic bonds, hydrogen bonds, van der Waals' forces and hydrophobic interactions. van der Waals' forces become significant in binding only when many substrate species can com..

Force and Inertia - An interaction which causes an acceleration is called a force. Only when we push a ball does it begin to move. A ball lying on a horizontal floor doesn't start to move all by itself. For that matter, take a parked a car on a horizontal road. Only when we activateh..

Soil - The word soil is derived from a Latin word solum meaning ground . It is a stratified mixture of inorganic and organic materials, both of which are products of decomposition. Inorganic component of soil i.e. mineral constituents are derived from the soil forming rocks, by fragmentation or wea..