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.
For other uses, see Metal (disambiguation) . A metal (from Greek Î¼Î­ÏÎ±Î»Î»Î¿Î½ metallon, mÃ©tallon, mine, quarry) metal is a (material an, element, compound or) alloy that is typically, hard, opaque, shiny and has good electrical and thermal. conductivityhen a metal ore is an ionic compound of that metal and a non-metal, the ore must usually be smelted â heated with a reducing agent â to extract the pure metal. Many common metals, such as iron, are smelted using carbon as a reducing agent.