What is active transport?
Q: What is active transport?
A: Active transport is when molecules move across a cell membrane from a lower concentration to a higher concentration, requiring energy, often from adenosine triphosphate (ATP).
Q: Why do cells use active transport?
A: Cells use active transport to get what they need, such as ions, glucose, and amino acids.
Q: In general, which way do molecules move?
A: In general, molecules move from an area of higher concentration to an area of lower concentration.
Q: What must be done to get molecules into the cell against the concentration gradient?
A: To get molecules into the cell against the concentration gradient, work must be done.
Q: Where is the work done in active transport?
A: The work is done in special proteins which act as ports in the cell membrane.
Q: Can imports get through the bilipid layer of the cell membrane?
A: No, imports cannot get through the bilipid layer of the cell membrane and must come through the ports in the membrane.
Q: What is often the source of energy for active transport?
A: Often, the source of energy for active transport is adenosine triphosphate (ATP).
