Asked by Jacqueline Effler on May 25, 2024
Verified
Troponin
A) has two subunits.
B) is part of the myosin myofilament.
C) is a long, flexible protein.
D) has a calcium-binding site.
E) binds to ATP.
Troponin
Globular protein component of the actin myofilament.
Calcium-Binding
Referring to the capability of certain proteins or molecules to bind calcium ions, which is important for various biological functions.
ATP
Adenosine Triphosphate, a molecule that carries energy within cells for metabolism and is considered the energy currency of life.
- Explain the process of muscle contraction and the roles of key proteins involved.
Verified Answer
JC
Jacob CourtneyMay 30, 2024
Final Answer :
D
Explanation :
Troponin is a complex of three regulatory proteins that is integral to muscle contraction in skeletal and cardiac muscle, but not smooth muscle. It is attached to the protein tropomyosin and lies within the groove between actin filaments in muscle tissue. One of its subunits has a specific site that binds to calcium ions, which causes a conformational change that allows for muscle contraction. It does not have just two subunits (it has three: TnC, TnI, and TnT), is not part of the myosin myofilament (it's associated with actin), is not described as a long, flexible protein in this context, and does not bind to ATP (that's a function of myosin).
Learning Objectives
- Explain the process of muscle contraction and the roles of key proteins involved.