AP Bio Insta-Review Topic 2.5*: Membrane Permeability

Front

What is membrane permeability?

Back

Membrane permeability refers to the ability of a membrane to allow substances to pass through it. It is influenced by the membrane's composition and the properties of the substances.

Front

Which type of molecules can easily cross the cell membrane unassisted?

Back

Small, nonpolar molecules can easily cross the cell membrane unassisted due to their size and lack of charge.

Front

What is peptidoglycan and where is it found?

Back

Peptidoglycan is a polymer that makes up the cell wall of some prokaryotes, providing structural support and protection.

Front

What is chitin and its role in fungi?

Back

Chitin is a structural polysaccharide that makes up the cell wall of fungi, providing rigidity and protection.

Front

What organelle is responsible for breaking down waste materials and cellular debris?

Back

Lysosome is the organelle that fuses with products from phagocytosis to break down waste materials.

Front

What is the function of channel proteins in the cell membrane?

Back

Channel proteins facilitate the passage of specific molecules, such as water, across the cell membrane.

Front

What is the difference between carrier proteins and channel proteins?

Back

Carrier proteins change shape to transport substances across the membrane, while channel proteins provide a passageway for specific molecules.

Front

What factors affect membrane permeability?

Back

Factors include the size and polarity of molecules, temperature, and the presence of specific proteins in the membrane.

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

Define selective permeability.

Back

Selective permeability is the property of a membrane that allows certain substances to pass while restricting others.