What would happen if a membrane protein were unable to bind to a signaling molecule? A.
Polar molecules would be able to cross the membrane.
B.
The cell nucleus would be filled with harmful chemicals.
C.
Large molecules would not be able to enter the cell.
D.
Messages would not be sent to the inside of the cell.

it c

Explanation:

In such cases, the entire cascade, controlled by that signaling protein, would fail to take place. In other words, that specific metabolic pathway will be diminished, or even completely obliterated.

C Large molecules would not be able to enter the cell.

Explanation:

looks like the answer is     c     to me!