Actin filaments are bound into bundles of parallel filaments by the proteins
A) filamin and spectrin.
B) troponin and tropomyosin.
C) profilin and thymosin.
D) $\alpha$-actinin and fimbrin.

Question

Quizplus · Accepted Answer

F1F1F1S1F1F1F10-actinin and fimbrin are the proteins that bind actin filaments into bundles of parallel filaments. Filamin and spectrin are involved in cross-linking actin filaments, troponin and tropomyosin are involved in regulating muscle contraction, and profilin and thymosin are involved in regulating actin polymerization.

Actin Filaments Are Bound into Bundles of Parallel Filaments by the Proteins