Question

what determines if a molecules can pass through the membrane? *

size

charge

polarity

all of the above

Explanation:

Cell membranes are selectively permeable. Small non - polar molecules (e.g., oxygen) can pass through easily. Larger molecules (e.g., some proteins) may have difficulty. Charged molecules (e.g., ions) and polar molecules (e.g., glucose) have more restricted movement. So size, charge, and polarity all play a role.

Answer:

All of the above.