Indicate whether each of the following descriptions better applies to equilibrium sedimentation (E) or velocity sedimentation (V). Your answer would be a four-letter string composed of letters E and V only, e.g. EEEE. ( ) It separates subcellular components based on their buoyant density. ( ) It can conveniently separate 15N-containing and 14N-containing DNA. ( ) It uses a shallow sucrose gradient to stabilize the sedimentation bands against convection. ( ) In this method, subcellular components may either move up or down to form discrete bands.