Troponin, a major protein in thin filaments, is a globular protein with three polypeptide subunits. Which of the following is NOT a function of the troponin?
A. One subunit binds to calcium ions.
B. One subunit attaches troponin to actin.
C. One subunit binds tropomyosin and helps position it on actin.
D. One subunit binds to potassium ions.
Ans: D. One subunit binds to potassium ions.
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A cell has engulfed a substance from the extracellular material and has migrated to a lymph node to interact with a helper T cell. Which of the following statements best describes this cell?
A. This is a cytotoxic T cell that interacts with the helper T cell through an MHC class II molecule. B. This is a cytotoxic T cell that interacts with the helper T cell through an MHC class I molecule. C. This is an antigen-presenting cell that interacts with the helper T cell through an MHC class I molecule. D. This is an antigen-presenting cell that interacts with the helper T cell through an MHC class II molecule.
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