Question

multiple choice question
the structure that contains binding sites for atp and actin is:
o the cross - bridge
o troponin
o tropomyosin
o the myosin head

Explanation:

The myosin head has binding sites for ATP and actin. During muscle - contraction, the myosin head binds to actin (forming cross - bridges) and also hydrolyzes ATP for energy. Cross - bridge is the connection formed when myosin head binds to actin. Troponin and tropomyosin are regulatory proteins involved in muscle contraction but do not have binding sites for both ATP and actin.

Answer:

the myosin head