Uniporter

Definition

A uniporter is a type of membrane transport protein that facilitates the movement of a single type of molecule or ion across a cell membrane down its concentration gradient. Uniporters are essential for passive transport processes within cells.

5 Must Know Facts For Your Next Test

1. Uniporters transport molecules without using cellular energy (ATP).
2. They move substances from areas of high concentration to low concentration.
3. Uniporters are specific to the type of molecule they transport.
4. They play a crucial role in maintaining cellular homeostasis.
5. Glucose transport into cells is a common example of uniporter activity.

Review Questions

• What type of molecule movement does a uniporter facilitate?
• How does the concentration gradient affect the function of a uniporter?
• Can you provide an example of a substance transported by a uniporter?

Related terms

Symporter: A membrane transport protein that moves two different molecules or ions in the same direction across the membrane.

Antiporter: A membrane transport protein that moves two different molecules or ions in opposite directions across the membrane.

Facilitated Diffusion: The process by which molecules pass across the membrane through cell membrane channels without energy input from the cell.