Unit Test: Homeostasis

Front

What type of transport does not require energy or a protein and moves molecules from high to low concentration?

Back

Passive transport

Front

The diffusion of water is called

Back

Osmosis

Front

The function of the cell membrane's lipid bilayer

Back

semipermable, allows only certain items in/out

Answer explanation

The cell membrane's lipid bilayer serves as a semipermeable barrier, allowing only certain items to pass in and out of the cell. This selective permeability helps maintain the cell's internal environment and regulate the exchange of substances with its surroundings. The other options, generating ATP, packaging items for transport, and producing proteins, are not the primary functions of the lipid bilayer.

Front

This must be true in order for diffusion to occur:
- molecules or particles must have different sizes
- special protein channels must ALWAYS be available
- there must be areas of different concentrations
- energy must be available

Back

there must be areas of different concentrations

Answer explanation

Diffusion is the passive movement of molecules or particles from an area of higher concentration to an area of lower concentration. For diffusion to occur, there must be areas of different concentrations, which creates a concentration gradient that drives the process. The other options are not necessary for diffusion to take place.

Front

When both sides of the membrane reach similar solute concentrations.

Back

equilibrium

Answer explanation

Equilibrium is the correct answer because it refers to the state when both sides of the membrane have reached similar solute concentrations. In this situation, there is no net movement of solute particles, and the system is considered to be in balance. Osmosis is the process that leads to equilibrium, while concentration and randomness are not directly related to this concept.

Front

Facilitated diffusion of water through a selectively permeable membrane

Back

osmosis

Answer explanation

Osmosis is the correct answer because it refers to the facilitated diffusion of water through a selectively permeable membrane. This process allows water molecules to move across the membrane from an area of higher concentration to an area of lower concentration, balancing the solute concentrations on both sides. The other options, pinocytosis, phagocytosis, and exocytosis, are not related to the diffusion of water through a membrane.

Front

During osmosis

Back

water moves from high to low concentration

Front

What is diffusion?

Back

when molecules move from a high concentration to a low.

Front

What is the primary function of osmosis in cells?

Back

To balance water concentration

Front

Which process involves the movement of molecules against a concentration gradient?

Back

Active transport