AMyosin
BTrypsin
CActin
DCollagen
Answer:
A. Myosin
Read Explanation:
A protein with both structural and enzymatic properties is myosin.
Structural Property: Myosin is a key component of muscle fibers, forming the thick filaments that are essential for the physical structure of a muscle. It works alongside actin (the thin filaments) to create the organized structure of the sarcomere, the fundamental unit of muscle contraction.
Enzymatic Property: Myosin also acts as an enzyme, specifically an ATPase. It can hydrolyze ATP (adenosine triphosphate) into ADP and a phosphate group. The energy released from this hydrolysis powers the "power stroke" of the myosin head, which pulls on the actin filament, leading to muscle contraction.
This dual role of being a physical structural element and an enzyme is what makes myosin a unique and fascinating protein.