Unformatted text preview: 113. Award: 1.00 point Problems? Adjust credit for all students. Match each protein with the appropriate ﬁlament. Elastic
Myosin Myosin Myosin Thick Filaments
Myosin heads Actin
Myosin heads Thin Filaments
Actin Troponin Active sites Neither Thick Nor Thin Filaments Dystrophin
Active sites Tropomyosin Dystrophin Elastic ﬁlament Elastic ﬁlament Explanation:
Thick filaments are about 15 nm in diameter. Each is made of 200500 hundred molecules of a protein called myosin. A myosin molecule
is shaped like a golf club, with two chains intertwined to form a shaftlike tail and a double globular head projecting from it at an angle.
The heads on one half of the thick filament angle to the left, and the heads on the other half angle to the right; in the middle is a bare
zone with no heads. Thin filaments, 7 nm in diameter, are composed primarily of two intertwined strands of a protein called fibrous (F)
actin. Each F actin is like a bead necklace—a string of subunits called globular (G) actin. Each G actin has an active site that can bind to
the head of a myosin molecule. A thin filament also has 40 to 60 molecules of yet another protein called tropomyosin. References Classification eBook & Resources Section: 11.02 ...
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- myosin heads