Biology Review

Front

What is a phospholipid bilayer?

Back

A phospholipid bilayer is a double layer of phospholipids that makes up the cell membrane, providing a barrier that separates the interior of the cell from the external environment.

Front

What is the origin of all cells?

Back

All cells come from pre-existing cells, meaning that new cells are produced by the division of existing cells.

Front

Are plants prokaryotes?

Back

False. Plants are eukaryotes, which means they have a defined nucleus and organelles.

Front

What is endocytosis?

Back

Endocytosis is a type of active transport where the cell membrane engulfs particles to form a vesicle, bringing substances into the cell.

Front

What is the function of the cell membrane?

Back

The cell membrane protects the cell, provides structure, and regulates the movement of substances in and out of the cell.

Front

Define active transport.

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy.

Front

What is passive transport?

Back

Passive transport is the movement of molecules across a cell membrane without the use of energy, typically from an area of higher concentration to an area of lower concentration.

Front

What are the main components of the cell membrane?

Back

The main components of the cell membrane are phospholipids, proteins, carbohydrates, and cholesterol.

Front

What is diffusion?

Back

Diffusion is the process by which molecules spread from an area of high concentration to an area of low concentration until equilibrium is reached.

Front

What role do proteins play in the cell membrane?

Back

Proteins in the cell membrane assist in transport, act as receptors, and provide structural support.