When you are defining terms such as 'active transport' or 'carrier proteins' and you talk about the movement of substances across membranes, would it be correct to say 'plasma membrane' or 'membrane' in general?
eg. - Active transport is the movement of dissolved substances across
the plasma membrane, which requires energy in order to move against a concentration gradient (from a region of relatively low solute concentration to a region of relatively high solute concentration)
or:Active transport is the movement of dissolved substances across
a membrane, which requires energy in order to move against a concentration gradient (from a region of relatively low solute concentration to a region of relatively high solute concentration)?
Thanks!