Tropomyosin molecules are threadlike proteins that lie end to end alongside the groove of the actin spiral.

Name: Tropomyosin molecules are threadlike proteins that lie end to end alongside the groove of the actin spiral.
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This is a correct statement. Tropomyosin molecules are long, thin proteins that are coiled around the actin filament and help regulate muscle contraction by covering and uncovering the myosin-binding sites on actin during muscle activity.

Tropomyosin Molecules Are Threadlike Proteins That Lie End to End