Question

which statement best describes how channel and carrier proteins in the plasma membrane are similar? 1. both allow for the flow of molecules into and out of a cell. 2. both directly connect the membrane to the nucleus of a cell. 3. both use energy to continuously move water molecules out of a cell. 4. both cause the phospholipid bilayer to form a rigid membrane for a cell.

Explanation:

Channel and carrier proteins are membrane - transport proteins. Their main function is to facilitate the movement of molecules across the plasma membrane, either into or out of the cell. They do not directly connect the membrane to the nucleus, do not use energy specifically to move water molecules out of the cell (osmosis is the main process for water movement and not directly related to these proteins' main function in this context), and do not cause the phospholipid bilayer to form a rigid membrane.

Answer:

1. Both allow for the flow of molecules into and out of a cell.