Chapter 8.3 Cell Transport Quiz

What is homeostasis?

• The process by which particles move from an area of higher concentration to an area of lower concentration

• A state of relatively constant internal physical and chemical conditions

• The movement of water across a cell membrane

• The active transport of substances into a cell

Answer explanation

Homeostasis is a state of relatively constant internal physical and chemical conditions, making it the correct choice.

Tags

NGSS.HS-LS1-3

NGSS.HS-LS1-7

What is diffusion?

• The active transport of substances into a cell

• The movement of water across a cell membrane

• The process by which particles move from an area of higher concentration to an area of lower concentration

• A state of relatively constant internal physical and chemical conditions

Answer explanation

Diffusion is the process by which particles move from an area of higher concentration to an area of lower concentration.

How do solute particles behave in water?

• They remain stationary and do not interact with each other

• They move constantly and collide with one another, tending to spread out randomly

• They clump together and settle at the bottom

• They move to the top of the water and float

Answer explanation

Solute particles in water move constantly, collide with each other, and tend to spread out randomly.

Tags

NGSS.MS-PS1-4

What is the tendency of particles in diffusion?

• To move from an area where they are less concentrated to an area where they are more concentrated

• To move randomly without any predictable pattern

• To move from an area where they are more concentrated to an area where they are less concentrated

• To remain in an area of equal concentration

Answer explanation

Particles in diffusion tend to move from an area where they are more concentrated to an area where they are less concentrated, following a concentration gradient.

What is passive transport?

• The movement of substances across a membrane requiring energy input from the cell

• The active transport of substances using cellular energy

• The diffusion of substances across membranes without requiring the cell to use additional energy

• The process by which cells maintain a higher concentration of solutes inside the cell

Answer explanation

Passive transport is the diffusion of substances across membranes without requiring the cell to use additional energy.

What is the role of proteins in the cell membrane during facilitated diffusion?

• They consume the cell's energy to transport molecules.

• They act as carriers or channels to make it easy for certain molecules to cross.

• They prevent any molecules from crossing the cell membrane.

• They produce new molecules to be transported across the membrane.

Answer explanation

Proteins in the cell membrane act as carriers or channels to facilitate the diffusion of certain molecules.

Does facilitated diffusion require the use of the cell's energy?

• Yes, it requires significant energy.

• Yes, but only a minimal amount of energy.

• No, it does not require any use of the cell's energy.

• It depends on the type of molecule being transported.

Answer explanation

Facilitated diffusion does not require any use of the cell's energy as it relies on the concentration gradient to move molecules across the cell membrane.

What type of molecules are typically transported through facilitated diffusion?

• Molecules that can easily cross the membrane without assistance.

• Only small, nonpolar molecules.

• Molecules that cannot cross the membrane and pass through special protein channels.

• Gases like oxygen and carbon dioxide exclusively.

Answer explanation

Facilitated diffusion involves the transport of molecules that cannot cross the membrane on their own and require special protein channels for passage.

Why can't water easily diffuse through the cell membrane?

• Because the cell membrane is permeable to all molecules.

• Because the cell's lipid bilayer is hydrophilic.

• Because the cell's lipid bilayer is hydrophobic.

• Because water is a large molecule.

Answer explanation

Water can't easily diffuse through the cell membrane because the cell's lipid bilayer is hydrophobic, repelling water molecules.

What are aquaporins?

• Enzymes that break down water molecules.

• Water channel proteins that facilitate the diffusion of water.

• Lipids that make the cell membrane hydrophilic.

• Transporters for all types of molecules.

Answer explanation

Aquaporins are water channel proteins that facilitate the diffusion of water across cell membranes, allowing for efficient water transport.