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Hormones are the chemical messengers of the body. They are defined as organic substances secreted into blood stream to control the metabolic and biological activities. These hormones are involved in transmission of information from one tissue to another and from cell to cell. These substances are p..

Question: The site of oxidation in a cell is the _____. 1. mitochondrion 2. endoplasmic reticulum 3. golgi apparatus 4. ribosome Answer: ..

Question: What are the functions of the female reproductive system? Answer: The main functions of the female reproductive system are: 1) to produce eggs 2) receive the sperms 3) provide the site for fertilization 4) implantation of the growing embryo and development of the foetu..

Humoral Immune System - The plasma b - cells produce a lot of anti-bodies, which circulate in the lymph. Each person can make 10 7 to 10 8 different kinds of antibody molecules so that there is an antibody for any antigen. The plasma membrane of each B cell should be sensitised by contact with a sp..

Control of Air Pollution - Air pollution can be controlled either at source or at the dispersal stage of various pollutants. Although, the problem of controlling air pollution at source is not easy, it can be reduced to some extent by taking steps such as: Use of modern techniques for efficient red..

It is the name given to the theory proposed by Charles Darwin (1809-1882). It is also known as the theory of natural selection. He formulated this theory along with another English biologist, Alfred Russel Wallace (1823-1913) in the year 1858. fig. 5.6 - Charles Darwin This theory is the resul..

I Cannot Remember my Mother - 'I Cannot Remember my Mother' is a gentle nostalgic poem written by 'Guru' Rabindranath Tagore. Tagore is one of the greatest poets of modern India (1861 - 1941). The national anthem of India was composed by him. His song 'Amaar Sonar Bangla' is the national anthem of ..

) 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 come simultaneously close to many..

>RNA cannot undergo replication and have to be synthesised only from DNA. Enzymes are basically proteins that function as biological catalysts. Enzymes carry on their catalytic action by lowering the activation energy required for a reaction to proceed. Sometimes an enzyme may have non-protein pros..

. It is possible to detect the differences at tandem-repeat sites with gel electrophoresis, a laboratory technique that uses an electric field to force molecules through a viscous gel. In this case, it separates the DNA fragments according to their length. Size alone dictates how..