Question

cystic fibrosis is a genetic disorder that creates excessive mucus in human organs. what is a person with this disorder missing? an important protein easily obtained through food the contractile proteins used in muscle movement the gene that codes for an important cell membrane protein an important organ that breaks down mucus

Explanation:

Cystic fibrosis is a genetic disorder. Genetic disorders are related to genes. The CFTR gene (which codes for a cell - membrane protein) is mutated in cystic fibrosis. Proteins obtained through food (if missing) would not be a genetic disorder. Contractile proteins (like actin and myosin) are related to muscle movement and not to cystic fibrosis. There is no specific organ solely for breaking down mucus in the context of this disorder.

Answer:

the gene that codes for an important cell membrane protein