These macromolecules are polar [polar: having different ends] because they are formed by head to tail condensation of polar monomers. Let's look at the three major classes of macromolecules to see how this works, and let's begin with carbohydrates.
Bostwick Steel Lath Company advertisement for steel truss loop type metal lath in 1920. A lath or slat is a thin, narrow strip of straight-grained wood used under roof shingles or tiles, on lath and plaster walls and ceilings to hold plaster, and in lattice and trellis work.
Metal Out Plus. For Swimming Pools. Controls iron staining and scale formation. Dissolved metals and minerals (such as iron, calcium, manganese and magnesium) in pool water. and corrosion of metal pool fittings will often cause staining and/or scaling. Metal Out Plus is an. aqueous solution of hydroxyethylidene-diphosphonic acid (HEDP) that is best used for metallic.