• Biochemistry,  Q & A

    Q & A ON WATER AND MINERAL SALT

    Q1.  What is the approximate percentage (in mass) of water in the human body? Is this percentage expected to be larger in the adult or in the old individual?  Ans: Approximately 65% of the human individual mass is water. The brain, for example, has around 90% of water in mass, the muscles, 85%, and the bones have between 25% and 40% of water. Younger adult individuals have proportionally more water in mass than older individuals. Q2.  What are the main biological functions of water? Ans: Water is the fundamental solvent for chemical reactions of living beings; it is the main means of substance transportation in the cell and between cells…

  • Biochemistry,  Cell biology,  Genetics

    WHAT IS DNA?

    Deoxyribonucleic acid (DNA) is a molecule that carries most of the genetic instructions used in the development, functioning, and reproduction of all known living organisms and many viruses. DNA is a nucleic acid; alongside proteins and carbohydrates, nucleic acids compose the three major macromolecules essential for all known forms of life. DNA  stores instructions for making other large molecules, called proteins. These instructions are stored inside each of your cells, distributed among 46 long structures called chromosomes. These chromosomes are made up of thousands of shorter segments of DNA, called genes. Each gene stores the directions for making protein fragments, whole proteins, or multiple specific proteins. DNA is well-suited to…