9th grade honors biology cell membrane and transport

What is the main function of the cell membrane?

• Regulate passage of substances

• Produce energy

• Store genetic information

• Maintain cell shape

Describe the structure of the cell membrane.

• The cell membrane is a single-layered structure

• The cell membrane is composed of carbohydrates only

• The cell membrane is impermeable to all substances

• The cell membrane is a phospholipid bilayer with embedded proteins.

Explain the difference between active and passive transport mechanisms.

• Active transport requires energy, passive transport does not.

• Active transport involves carrier proteins, passive transport involves channel proteins.

• Active transport occurs through osmosis, passive transport occurs through facilitated diffusion.

• Active transport moves molecules from low to high concentration, passive transport moves molecules from high to low concentration.

Give an example of a passive transport process.

• Facilitated diffusion

• Active transport

• Endocytosis

• Simple diffusion

How does osmosis differ from diffusion?

• Osmosis involves the movement of gases specifically, while diffusion involves the movement of any type of particle.

• Osmosis is a faster process than diffusion due to the involvement of water molecules.

• Osmosis only occurs in living organisms, while diffusion occurs in non-living systems.

• Osmosis involves the movement of water molecules specifically, while diffusion involves the movement of any type of particle.

What is the role of endocytosis in a cell?

• Endocytosis is the process by which cells absorb molecules by engulfing them.

• Endocytosis is the process of releasing molecules from a cell

• Endocytosis is the process of breaking down molecules in a cell

• Endocytosis is the process of creating new molecules in a cell

Discuss the process of exocytosis.

• Exocytosis is the process by which cells break down substances within the cell.

• Endocytosis is the process by which cells release substances from intracellular vesicles into the extracellular space.

• Exocytosis is the process by which cells absorb substances from the extracellular space into intracellular vesicles.

• Exocytosis is the process by which cells release substances from intracellular vesicles into the extracellular space.

How do transport proteins assist in moving molecules across the cell membrane?

• Transport proteins only allow movement of molecules in one direction across the cell membrane.

• Transport proteins act as channels or carriers to facilitate the movement of molecules across the cell membrane.

• Transport proteins break down molecules before moving them across the cell membrane.

• Transport proteins are not involved in moving molecules across the cell membrane.

What happens to a cell placed in a hypertonic solution?

• The cell will remain the same size

• The cell will divide

• The cell will expand

• The cell will shrink or shrivel.

Why is the cell membrane considered selectively permeable?

• It allows certain substances to pass through while restricting the passage of others.

• It is impermeable to all substances.

• It only allows water to pass through.

• It allows all substances to pass through freely.