Which is the best definition of a polymer?
a simple molecule with basic properties and functions
two molecules held together with an ionic bond
a combination of three or more monomer molecules in a chain

Do the following statements describe actin, myosin, both of the proteins or neither of the proteins? (a) contains a binding site for calcium (b) found in the i band (c) exists in a globular (g) form and a filamentous (f) form (d) contains a binding site for atp (e) is a component of the thin filament (f) is a component of the thick filament