`alpha` - 1 antitrypsin is

Options

A. an antacid.
B. an enzyme
C. used to treat arthritis
D. used to treat emphysema

Answer

D

Explanation

Transgenic animals that produce useful biological products can be created by the introduction of the portion of DNA (or genes) which codes for a particular product such as human protein (`alpha`-1-antitrypsin) used to treat emphysema.