Discuss active transport with a relevant diagram.

Active transport is a biological process that moves molecules across cell membranes from regions of lower concentration to regions of higher concentration, contrary to the natural direction of diffusion. This process requires energy, typically derived from adenosine triphosphate (ATP), to transport substances against their concentration gradient.

Mechanism:

1. Energy Source: Active transport relies on ATP or another source of energy to move molecules. This energy is necessary because moving substances against their gradient is energetically unfavorable.

2. Transport Proteins: Integral membrane proteins, known as pumps, are involved in active transport. These proteins undergo conformational changes to bind, transport, and release molecules across the membrane.

3. Types of Active Transport:

   • Primary Active Transport: Directly uses energy from ATP hydrolysis. Example: The sodium-potassium pump (Na+/K+ pump) maintains high intracellular potassium and low sodium concentrations.
   • Secondary Active Transport: Uses energy from the electrochemical gradient created by primary active transport. It includes:
     • Symporters: Move two or more ions or molecules in the same direction.
     • Antiporters: Move ions or molecules in opposite directions.

Diagram Explanation:

1. Cell Membrane: Represented as a lipid bilayer with embedded proteins.
2. Transport Protein (Pump): A protein spanning the membrane, responsible for moving ions.
3. ATP Molecule: Provides the energy needed for the pump.
4. Ions/Molecules: Indicate the substances being transported.

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