AP Biology Unit 2 Review Qs

Front

What is osmosis?

Back

Osmosis is the movement of water across a selectively permeable membrane from an area of high water concentration to an area of low water concentration.

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, typically along a concentration gradient.

Front

What is the fluid mosaic model?

Back

The fluid mosaic model describes the structure of cell membranes as a mosaic of various components (lipids, proteins, carbohydrates) that are fluid and can move laterally within the layer.

Front

What role do carbohydrates play in the plasma membrane?

Back

Carbohydrates are located on the exterior surface of the plasma membrane and are involved in cell recognition and signaling.

Front

Why is active transport necessary?

Back

Active transport is necessary to move substances against their concentration gradient, which requires energy, to maintain cellular homeostasis.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses transport proteins to help move substances across the membrane without energy.

Front

What is the significance of membrane fluidity?

Back

Membrane fluidity allows for flexibility, movement of proteins, and the ability to self-heal, which is crucial for cell function.

Front

What is a selectively permeable membrane?

Back

A selectively permeable membrane allows certain molecules to pass through while blocking others, maintaining the internal environment of the cell.

Front

What is the difference between diffusion and osmosis?

Back

Diffusion is the movement of solutes from high to low concentration, while osmosis specifically refers to the movement of water.

Front

What is the role of transport proteins?

Back

Transport proteins facilitate the movement of substances across the cell membrane, either passively or actively.