Biochemistry and Cells Part B

Front

What is Passive Transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy. It occurs along the concentration gradient, from areas of high concentration to areas of low concentration.

Front

What is Simple Diffusion?

Back

Simple diffusion is a type of passive transport where small, nonpolar molecules move directly through the phospholipid bilayer of the cell membrane from an area of high concentration to an area of low concentration.

Front

What is Active Transport?

Back

Active transport is the movement of substances across a cell membrane against their concentration gradient, requiring energy (usually in the form of ATP).

Front

What is Facilitated Diffusion?

Back

Facilitated diffusion is a type of passive transport that uses protein channels or carriers to help move molecules from an area of high concentration to an area of low concentration.

Front

What is Osmosis?

Back

Osmosis is the passive transport of water molecules across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is the role of ATP in Active Transport?

Back

ATP provides the energy required for active transport processes, allowing cells to move substances against their concentration gradient.

Front

What happens to the Surface Area to Volume (SA:V) ratio as a cell increases in size?

Back

As a cell increases in size, the SA:V ratio decreases, meaning there is less surface area available for exchange of materials relative to the volume of the cell.

Front

What is Exocytosis?

Back

Exocytosis is the process by which a cell expels materials in vesicles that fuse with the cell membrane, releasing their contents outside the cell.

Front

What is Endocytosis?

Back

Endocytosis is the process by which a cell takes in materials by engulfing them in a vesicle formed from the cell membrane.

Front

What is Bulk Transport?

Back

Bulk transport refers to the movement of large quantities of materials into or out of a cell, which can occur via exocytosis or endocytosis.