What type of movement occurs across this membrane?

Question

In the image, the dashed line represents a membrane separating two solutions that is selectively permeable to solutes. The solution on the left is Solution A (50 mg/mL). The solution on the right is Solution B (75 mg/mL). 

 (I can’t insert the image, but Sol. A has dots spread out and on the other side of the dashed line, there are more dots, closer together. 

What type of movement, if any,is occurring across the membrane?

a. Active transport

b. Diffusion

c. Osmosis

d. Facilitated diffusion 

Answer 1

Please use this table to answer this questions. Do protein transporters or energy (ATP) are involved? What choices you can eliminate? If we have membrane but no protein transporters or energy (ATP) involved, what your choice would be?

Features	Diffusion	Osmosis	Facilitated	Active (against concentration gradient with input of energy)
Energy needed	No	No	No	Yes (adenosine triphosphate ATP)
Mediator or transporter proteins	No	No	Yes (transporter proteins)	Yes (transporter proteins)
Direction	a solute in a solvent from higher to lower concentration region *example: solute: salt; solvent:water	diffusion of water or a solvent or solute through a semipermeable membrane from higher to lower concentration region	from higher to lower concentration region	from lower to higher concentration region