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The ATPase enzyme is found in the heads of myosin cross-bridges. The I-band is composed of actin. During muscle contraction, actin moves over myosin. Troponin plays a role in linking with myosin cross-bridges.

1. True
2. False
3. Partially true
4. None of the above

Correct answer: False

Solution

The statement is false because troponin does not directly establish a connection with myosin cross bridges. Instead, it regulates the binding of myosin to actin by controlling the position of tropomyosin on the actin filament.

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