Which of these statements about enzymes is true? Select all correct answers.
a. Enzymes can help break chemical bonds.
b. Enzymes always change their shape when they bind
to a molecule.
c. Enzymes can break down a variety of different
substances.
d. An enzyme’s shape is related to the shape of the
substrate it binds to.

b. Enzymes always change their shape when they bind  to a molecule.

d. An enzyme’s shape is related to the shape of the  substrate it binds to.

Explanation:

Enzymes are proteins that are secreted by special cells in living organisms. They are the organic catalysts of biochemical reactions.

The role of the enzyme in the enzyme catalyzed reaction is to bring reactants together on its surface so as to have better interactions.

Enzymes have the capability to fit the substrate into an induced fit position.

The process by which enzymes change shape in a reaction is called the induced fit.

This way an enzyme holds the substrate tightly for the reactions to occur.

after a the power stroke, adp is released, but the cross-bridge formed is still in place. atp then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.