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How and why could this have occurred?

Nucleic acid certain protein cell membranes certain carbohydrates

What is gene expression control that occurs after the generation of rna

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