Cell Homeostasis

Which homeostatic process requires energy to move particles across the plasma membrane?

• active transport

• passive transport

Which homeostatic process moves particles against a concentration gradient?

• active transport

• No idea

Which statement describes the ability of the cell membrane to allow various substance to move through it?

• The cell membrane is selectively permeable.

• The cell membrane is NOT selectively permeable.

Which best describes dynamic equilibrium?

• Particles are moving into and out of the cell, but their concentrations remain stable.

• Particles are moving into and out of the cell, but their concentrations remain INSstable.

Which best describes the difference between osmosis and diffusion?

• Diffusion is the movement of particles from a high to low particle concentration, while osmosis is the movement of water from a high to a low water concentration.

• Diffusion DOES NOT HAVE movement of particles from a high to low particle concentration, while osmosis is the movement of water from a high to a low water concentration.

Reptiles and birds excrete waste as an insoluble white solid that is called uric acid. How does this help them to maintain internal homeostasis in hot climates?

• by retaining water

• by retaining heat

How does the contractile vacuole in a single-celled organism function to maintain homeostasis?

• It pumps water out of the cell.

• It pumps water into the cell.

Which solution would most likely cause a plant placed in it to become firmer and more rigid?

• hypotonic

• hypertonic

Molecules naturally move from areas of _______ to ______ concentration.

• lower to higher
• higher to lower

Identify the characteristic: When a dog is too hot, he will sweat through his paws and pant to cool himself down.

• Reproduce

• Made of cells

• Share similar chemicals

• Homeostasis