Question

Select all of the following that correctly describe plant cell membranes?

1) They are composed of a phospholipid bilayer
2) They regulate the movement of substances in and out of the cell
3) They contain proteins that help with cell signaling
4) They are permeable to all molecules
5) They provide structural support to the cell

Answer 1

Plant cell membranes are composed of a phospholipid bilayer, contain proteins for cell signaling, regulate substance movement, and provide structural support, but are not permeable to all molecules as they are selectively permeable.

Step-by-step explanation:

The plant cell membranes can be correctly described by the following statements:

1. They are composed of a phospholipid bilayer.
2. They regulate the movement of substances in and out of the cell.
3. They contain proteins that help with cell signaling.
4. They provide structural support to the cell.

However, the statement that they are permeable to all molecules is incorrect. Cell membranes are selectively permeable, meaning they allow certain substances to pass through while blocking others to maintain homeostasis within the cell.