1 Chronic bronchitis: A form of COPD characterized by a chronic productive cough. 2  Emphysema: Lung damage allows air to be trapped in the lungs in this form of COPD. 3  Difficulty blowing air out is its hallmark. 4  Acute bronchitis: A sudden infection of the airways, usually by a virus.
There are only 46 DNA molecules ( 23 pairs) in human somatic cell. There are about 22000 genes and close to 3.2 billion base pairs in total.
What are the molecules that make up DNA? There are six molecules that make up DNA. These are: a five carbon sugar called deoxyribose, a phosphate group and four nitrogenous bases, which are thymine, guanine, aden â¦ ine, thymine and cytosine.