Question

The main function of plasma membrane

• A. Maintain cell shape and size
• B. Control of all cellular activity
• C. Regulate the flow of materials into and out of the cell
• D. Store cell material

Answer 1

The correct option is C Regulate the flow of materials into and out of the cell

Cell Membrane Functions

• Form specialized compartments by selective permeability
  • Unique environment
  • Creation of concentration gradients
  • pH and charge (electrical, ionic) differences
• Asymmetric protein distribution
• Cell-Cell recognition
• Site for receptor molecule binding for cell signalling
  • Receptor binds ligand (such as a hormone)
  • Induces intracellular reactions
• Controls and regulates reaction sequences
  • Product of one enzyme is the substrate for the next enzyme
  • Can "line up" the enzymes in the proper sequence