IB Flashcard: B2.1 (Cells)

Front

What process allows oxygen to pass across the cell membrane?

Back

Simple Diffusion

Front

What are the components of phospholipids?

Back

Hydrophilic phosphate head & hydrophobic hydrocarbon tail

Front

What is an intrinsic or integral protein in a membrane diagram?

Back

B.

Front

What is molecule X in the plasma membrane diagram?

Back

Cholesterol

Front

What are the parts of the cell membrane indicated in the diagram?

Back

A.

Front

Define osmosis.

Back

The movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is active transport?

Back

The movement of molecules across a membrane against their concentration gradient, requiring energy.

Front

Explain facilitated diffusion.

Back

The process of passive transport of molecules across a membrane via specific transmembrane integral proteins.

Front

What role do glycoproteins play in the cell membrane?

Back

They are involved in cell recognition and signaling.

Front

What is the function of cholesterol in the plasma membrane?

Back

To maintain membrane fluidity and stability.