Question

pre-lab video coaching activity: diffusion and osmosis
4 parts | -- of 1 point
place the term in the appropriate blanks in the sentences about diffusion and osmosis. make certain each sentence is complete before submitting your answer.
show instructions
passive

1. during osmosis, water moves

its concentration gradient.
active

1. diffusion and osmosis are

processes.
down
lower

1. osmosis is the movement of a solvent from an area of

concentration to an area of
concentration across a selectively permeable membrane.
up
higher

1. diffusion is the movement of solutes from an area of

concentration to an area of
concentration.

Explanation:

Question 1

Osmosis is the movement of water across a semipermeable membrane. Water moves down its concentration gradient (from higher water concentration to lower water concentration, which is equivalent to moving down the gradient of water potential). So the term here is "down".

Diffusion and osmosis do not require energy input. They are passive processes as they rely on the natural concentration gradient and do not need ATP or other energy sources to occur. So the term is "passive".

In osmosis, the solvent (usually water) moves from an area of higher solvent concentration (which is lower solute concentration) to an area of lower solvent concentration (higher solute concentration) across a selectively permeable membrane. So the first blank is "higher" (solvent concentration) and the second is "lower" (solvent concentration, or higher solute concentration).

Answer:

down

Question 2