Question

the diffusion of water across a selectively permeable membrane is called

osmotic pressure.

osmosis.

facilitated diffusion.

active transport.

diffusion is the movement of molecules from

an area of low concentration to an area of high concentration.

an area of high concentration to an area of low concentration.

an area of equilibrium to an area of high concentration.

all of the above

which of the following is released during cellular respiration?

oxygen

air

energy

lactic acid

Explanation:

First Question:

To solve this, we recall the definitions:

• Osmotic pressure is the pressure needed to stop osmosis.
• Osmosis is the diffusion of water across a selectively permeable membrane.
• Facilitated diffusion is the transport of substances via proteins across a membrane (not specific to water).
• Active transport requires energy and moves substances against concentration gradients (not water diffusion in this context). So the correct term for water diffusion across a selectively permeable membrane is osmosis.

Diffusion is the passive movement of molecules. By definition, molecules move from an area of high concentration to an area of low concentration (down the concentration gradient) to reach equilibrium. The other options describe non - diffusion or incorrect directions. So diffusion is the movement from high to low concentration.

During cellular respiration (aerobic, mainly), glucose and oxygen are used, and carbon dioxide, water, and energy (ATP) are produced. Oxygen is used (not released), air is a mixture (not a product), lactic acid is a product of anaerobic respiration in some cases, but energy (ATP) is released in both aerobic and anaerobic respiration. So energy is released during cellular respiration.

Answer:

B. osmosis

Second Question: