Physiology A small ca+2 binding protein that modifies the activity of many enzymes and other proteins in response to changes of ca2+ concentration, is known as A Cycline B Calmodulin C Collagen D Kinesin 💡 Explanation A small ca+2 binding protein that modifies the activity of many enzymes and other proteins in response to changes of ca2+ concentration, is known as ✓ Correct Answer: B. Calmodulin