What is DNA DNA?

DNA Definition Deoxyribonucleic acid , or DNA, is a biological macromolecule that carries hereditary information in many organisms. DNA is necessary for the production of proteins, the regulation, metabolism, and reproduction of the cell .

What do you mean by breathing?

A physical process by which oxygen is taken in and carbon dioxide is given out is called breathing.

What happens to the ribcage when we breathe in?

Ribs get moved up when we breathe in and flatter-r the diaphragm due to which the chest cavity becomes larger. Hence, the air is sucked into the lungs and fills the expanded alveoli. Haemoglobin binds with the oxygen and carries it along the blood in the body.

How was DNA discovered?

DNA was isolated and discovered chemically before its functions became clear. DNA and its related molecule, ribonucleic acid (RNA), were initially identified simply as acidic molecules that were present in the nucleus.