Biochemistry In response to changes in Ca2+ concentration, which of the following Ca2+ binding protein can modify the activity of many enzymes & proteins? A Calmodulin B Collagen C Kinesin D Elastin 💡 Explanation In response to changes in Ca2+ concentration, which of the following Ca2+ binding protein can modify the activity of many enzymes & proteins? ✓ Correct Answer: A. Calmodulin