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 structure and the properties of the substances.

Front

Which organisms do NOT have a cell wall?

Back

Protists are organisms that do not have a cell wall, unlike fungi and plants.

Front

What is phagocytosis?

Back

Phagocytosis is a type of endocytosis where a cell engulfs large particles or other cells using pseudopods.

Front

Can water cross the cell membrane unassisted?

Back

Yes, a small amount of water can cross the membrane unassisted due to its small size.

Front

What is the primary component of the cell wall in some prokaryotes?

Back

Peptidoglycan is the primary component of the cell wall in many prokaryotes.

Front

Which molecule passes through the membrane most easily?

Back

Carbon dioxide passes through the membrane most easily due to its small size and nonpolar nature.

Front

What is the role of cholesterol in the cell membrane?

Back

Cholesterol helps to stabilize the fluidity of the cell membrane, making it less permeable to very small water-soluble molecules.

Front

What is the difference between passive and active transport?

Back

Passive transport does not require energy and moves substances down their concentration gradient, while active transport requires energy to move substances against their concentration gradient.

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a selectively permeable membrane.

Front

What is the function of the cell membrane?

Back

The cell membrane protects the cell, provides structure, and regulates what enters and exits the cell.