Question

hacker: clearly, the health of the cells has improved! compared to the situation when you entered the lab, how has adding the transporter proteins contributed to healthier cells?
a) the cell now lets molecules through non - selectively
b) the cell membrane is now a selective barrier
c) the cells now have different types of lipids
d) the cell is now a separate compartment

Explanation:

Transporter proteins help regulate the movement of molecules across the cell - membrane, which is a selective barrier. They do not make the cell non - selectively let molecules through. Adding transporter proteins does not directly change the types of lipids in the cell, and the cell is already a separate compartment by nature of having a cell - membrane.

Answer:

B. The cell membrane is now a selective barrier