Question

why is the phospholipid bilayer important to cell survival? select the two answers that are correct. □ it acts as a barrier for some, but not all, molecules on either side of it. □ it maintains homeostasis by forming an insulating layer around the cell. □ it blocks small, nonpolar molecules from entering the cell and harming it. □ it anchors nucleotides together as they form molecules of dna. □ it separates the cellular environment from the external environment.

Explanation:

The phospholipid bilayer is selectively permeable, acting as a barrier for some molecules (e.g., large polar molecules) while allowing others (e.g., small nonpolar molecules) to pass, which is key to regulating molecular movement. It also physically separates the cell's internal environment from the external surroundings, a fundamental requirement for maintaining cellular integrity and function. The other options are incorrect: it does not form an insulating layer for homeostasis, does not block small nonpolar molecules, and does not anchor nucleotides in DNA formation.

Answer:

It acts as a barrier for some, but not all, molecules on either side of it.
It separates the cellular environment from the external environment.