Question

Lactose intolerance and cystic fibrosis are two conditions that affect people based on genetics. Although lactose intolerance and cystic fibrosis are very different from each other, they do have some similarities. Which of the following is/are true about both lactose intolerance and cystic fibrosis?

A. Both affected proteins (CFTR and lactase) span the cell membrane

B. Both affected proteins (CFTR and lactase) are transport proteins

C. Both affected proteins (CFTR and lactase) are found in the same types of cells

D. A and B are both correct

E. A and C are both correct

Answer 1

The answer is option E

CFTR (Cystic Fibrosis Transmembrane Conductance Regulator) is a channel protein that transports ions in the cell membrane.  CFTR is a membrane protein that transports ions. Lactase is a protein that acts as a biological catalyst and facilitates the breaking down of the Lactose. Both CFTR and lactase are found in the epithelial cells. CFTR and Lactase are transmembrane proteins that span the cell membrane.

Therefore the answer is option is E - A and C are both correct

CFTR is a transport protein, but lactase is not a transport protein. Lactase is a biological catalyst. Lactase is a catalytic protein. Therefore option B is incorrect