Which protein is known for catalyzing chemical reactions at the cell membrane?

Which protein is known for catalyzing chemical reactions at the cell membrane?

• A. Enzymatic Proteins
• B. Carrier Protein
• C. Channel Protein
• D. Receptor Protein

Answer: (A)

Membrane-bound enzymes catalyze chemical reactions right at the cell surface, making them the proteins that actually speed up reactions in that location. Among the options, only enzymatic proteins have catalytic activity; they are the ones that lower the activation energy of a reaction happening at the membrane. Channel proteins form pores to let substances pass through; they don’t change chemical bonds themselves. Carrier proteins change shape to shuttle substances across the membrane but don’t catalyze chemical transformations. Receptor proteins bind signals to initiate a response, but they don’t catalyze chemical reactions. A good example is a membrane enzyme like Na+/K+ ATPase, which hydrolyzes ATP to drive ion transport, or brush border enzymes on intestinal cells that break down disaccharides at the membrane. So enzymatic proteins are the ones known for catalyzing chemical reactions at the cell membrane.

Membrane-bound enzymes catalyze chemical reactions right at the cell surface, making them the proteins that actually speed up reactions in that location. Among the options, only enzymatic proteins have catalytic activity; they are the ones that lower the activation energy of a reaction happening at the membrane.

Channel proteins form pores to let substances pass through; they don’t change chemical bonds themselves. Carrier proteins change shape to shuttle substances across the membrane but don’t catalyze chemical transformations. Receptor proteins bind signals to initiate a response, but they don’t catalyze chemical reactions.

A good example is a membrane enzyme like Na+/K+ ATPase, which hydrolyzes ATP to drive ion transport, or brush border enzymes on intestinal cells that break down disaccharides at the membrane. So enzymatic proteins are the ones known for catalyzing chemical reactions at the cell membrane.