What parts of a nucleotide make up the back bone of a nucleic acid?

Body systems are not completely independent they integrate and work together describe one example of the integration between body systems

At which location in earth’s interior does the top density continue to increase as thickness decreases?

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