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  RED BLOOD CELLS Red blood cell are also called red blood corpuscles,   haematids, erythroid cells or erythrocytes .It is the most abundant cellular component of blood which helps to carry oxygen from the lungs to the tissues. The mature human red blood cell is small, round and biconcave. It appears dumbbell-shaped. The cell is flexible and assumes a bell shape as it passes through extremely small blood vessels. It is covered with a membrane composed of lipids and proteins and contains hemoglobin—a red iron-rich protein. The cells develop in the bone marrow and circulate for about 100–120 days in the body before their components are recycled by macrophages. Red cells contain a special protein called hemoglobin, which helps carry oxygen from the lungs to the rest of the body and then returns carbon dioxide from the body to the lungs so it can be exhaled. Blood appears red because of the large number of red blood cells, which get their color from the hemoglobin. Mature red bl...

                            DNA WORLD WHAT IS DNA ? DNA is  Deoxyribo Nucleic Acid. It is a  self-replicating material in every living organism.  It is a carrier of all genetic information of a person  needed for organisms to develop, grow, survive, and reproduce. It’s a one long molecule that contains our genetic “code,” or recipe. This recipe is the starting point for our development, but DNA’s interaction with outside influences such as our lifestyle, environment, and nutrition ultimately form the human being. DISCOVERY OF DNA In 1866 – Before the many significant discoveries and findings, Gregor Mendel, who is known as the “Father of Genetics,” was actually the first to suggest that characteristics are passed down from generation to generation. Mendel coined the terms we all know today as recessive and dominant. In 1869 – Friedrich Miescher identified the “nuclein” by isolating a molecule from ...