Question

How do small molecules move through the membrane?

A. They are flipped across by the proteins
B. They move through tiny pores
C. They can't pass at all

Answer 1

Hello

B. They move through tiny pores

Answer 2

`\boxed {\tt B. \ They \ move \ through \ tiny \ pores}`

Step-by-step explanation:

Cell membranes are selectively permeable, which means certain molecules can pass in and out, but others cannot.

One factor is size. Small molecules can move through openings in the membrane, but bigger ones cannot pass and usually need assistance from carrier proteins.

Therefore, the best answer choice is B. They move through tiny pores