Which statement about actin is not true?
A. There are two actin genes, one for F-actin and one for G-actin.
B. Monomeric G-actin polymerizes to form F-actin.
C. Actin filaments are polar (the ends can be distinguished).
D. Actin can bind ATP.
E. Actin is a common protein in nonmuscle cells.
Answer: A. There are two actin genes, one for F-actin and one for G-actin.
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