Cell Transport Practice

What is facilitated diffusion?

• Facilitated diffusion is the active transport of molecules against their concentration gradient.

• Facilitated diffusion requires energy for the transport of molecules.

• Facilitated diffusion is the passive transport of molecules through the membrane with the help of specific proteins.

• Facilitated diffusion occurs only in plant cells and not in animal cells.

Compare diffusion and osmosis

• Diffusion requires a semi-permeable membrane, whereas osmosis does not.

• Diffusion occurs only in gases, whereas osmosis occurs in liquids.

• Diffusion is the general movement of molecules, whereas osmosis specifically involves the movement of water across a membrane.

• Osmosis is the movement of all types of molecules, whereas diffusion is only for water.

A cell shrinks in a ______________ solution

What is the fluid mosaic model?

• A framework for understanding cellular respiration.

• The fluid mosaic model is a conceptual model that describes the structure and behavior of cell membranes.

• A theory about the genetic code of organisms.

• A model that describes the process of photosynthesis.

How do cells support the movement of materials?

• The cell membrane controls what enters and exits the cell.

• Cells rely solely on gravitational force for the movement of materials.

• Cells transport materials only through mechanical means.

• Mitochondria produce energy for the cell.

Tags

NGSS.MS-LS1-2

NGSS.MS-LS1-7

Which process does this image show?

• Active Transport

• Osmosis

• Facilitated Diffusion

• Diffusion

Passive transport always moves with the concentration gradient.

• True

• False

What is a concentration gradient?

• A concentration gradient is the rate at which a substance moves through a medium.

• A concentration gradient refers to the temperature difference between two areas.

• A concentration gradient is the total amount of a substance in an area.

• A concentration gradient is the difference in concentration of a substance between two areas.

Tags

NGSS.HS-LS2-4

Water always flows to a ________________ solution to reduce

What is the relationship between osmosis and equilibrium?

• Osmosis reaches equilibrium by equalizing solute concentrations on both sides of the membrane.

• Osmosis occurs only in the presence of a vacuum, not in equilibrium.

• Equilibrium is achieved without the movement of water or solutes.

• Osmosis prevents equilibrium by maintaining different solute concentrations.