Membrane Transport

Front

What is active transport?

Back

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

Front

What is the primary energy source for active transport?

Back

The primary energy source for active transport is ATP (adenosine triphosphate).

Front

What is exocytosis?

Back

Exocytosis is a form of active transport where materials are expelled from a cell through vesicles that fuse with the plasma membrane.

Front

What is endocytosis?

Back

Endocytosis is a process by which cells engulf substances from their external environment, bringing them into the cell.

Front

What does selectively permeable mean?

Back

Selectively permeable refers to a property of cell membranes that allows certain molecules to pass through while blocking others.

Front

What is the fluid mosaic model?

Back

The fluid mosaic model describes the structure of the cell membrane as a mosaic of various proteins that float in or on the fluid lipid bilayer.

Front

What is an isotonic solution?

Back

An isotonic solution is one where the concentration of solutes is equal inside and outside the cell, resulting in no net movement of water.

Front

What is a hypertonic solution?

Back

A hypertonic solution has a higher concentration of solutes compared to the inside of the cell, causing water to move out and the cell to shrink.

Front

What is a hypotonic solution?

Back

A hypotonic solution has a lower concentration of solutes compared to the inside of the cell, causing water to move in and the cell to swell.

Front

What is the role 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.