Molecules that have a atomic weight of ______ can not enter the cell membrane?

Answer 1

This question is misleading. You'll have to check over your specific text or class notes to find out what your teacher was thinking.

Atomic weight is not the only, nor the primary factor, in determining what passes through a cell membrane. Polarity plays at least as important a role, but membrane transports exists for polar molecules and for large molecules. Substances for which transports exist vary from system to system.

Answer 2

is it weight?

i thought it was size like microns etc..

although perhaps it is the basis of rate of displacement

I don't see how weight enters the picture..

on the contrary an infintismal amount of weight can be contained inside a cell. (of course finding something small enough to fit inside without breaking the structure is another matter)

if the entire universe then revolved around the center of that mass, then the cell would form like a sphere around the atomic grain. (like a blackhole..)

what grade/course is it for?