In a motility assay, investigators attach myosin motor proteins to a glass slide and then add actin filaments. once the filaments have bound to myosin, what can be expected to occur?

 The correct answer is :  In the presence of ATP, the filaments will glide toward their minus ends

Explanation:  During muscle contraction, the myosin and actin filaments do not change in length. Actin filaments are important because they perform several major functions in some types of cells including muscle contraction.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

the answers are a and c