Question

Transport proteins are required for

• A. Diffusion
• B. Osmosis
• C. Facilitated transport
• D. Facilitated transport and active transport

Answer 1

The correct option is D Facilitated transport and active transport

• A transport protein is a protein that serves the function of moving other materials within an organism. Transport proteins are vital to the growth and life of all living things.
• Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special transport. Some molecules and ions such as glucose, sodium ions and chloride ions are unable to pass through the lipid bilayer of cell membranes.
• Inactive transport specialized transmembrane recognize the substance and allow it to access to cross the membrane, when it otherwise would not, either because it is one to which the phospholipid bilayer of the membrane is impermeable or because it is moved against the concentration gradient.