The plasma membrane (select all that are true):

Question

BlackTom AI · Accepted Answer

When evaluating statements about the plasma membrane, it helps to recall its basic structure and functions.
Option 1: 'Restricts movement of materials in and out of the cell' — This is accurate. The plasma membrane is selectively permeable, containing channels, carriers, and a phospholipid bilayer that regulate what enters and exits the cell.
Option 2: 'Is often a triple layer comprised of lipids' — This is incorrect. The membrane is best described as a phospholipid bilayer, not a trilayer; the two leaflets of lipids form the fundamental barrier, with embedded proteins, cholesterol, and other molecules.
Option 3: 'Prevents essential nutrients from escaping' — This is true in the sense that the membrane helps retain nutrients inside the cell by restricting passive diffusion of many solutes; it maintains internal conditions by selective permeability and active transport mechanisms for nutrients.
Option 4: 'Contains hydrophobic tails pointing outward' — This is false. The hydrophobic (fatty acid) tails face inward, away from water, forming the interior of the bilayer, while the hydrophilic heads face the aqueous environments on either side of the membrane.
Thus, the true statements are those describing selective movement regulation (Option 1) and retention of essential nutrients via selective permeability (Option 3), while Options 2 and 4 misstate membrane structure or orientation.

The plasma membrane (select all that are true):

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