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.
Small circular molecules of DNA in bacteria are called? The circular DNA molecules that can be found in bacteria are called plasmids. Plasmids are a separate DNA molecule that can replicate independently of chromosomal DNA. Pla â¦ smids are commonly used in Biology classes to teach students about splicing.