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 small cracks and holes where the plaster is still firmly attached to the lath or after you have repaired a loose wall with adhesive, you can cover cracks by first attaching self-adhesive fiberglass tape or a metal screen cut to the size of a hole.irst, lath attached to the wall studs. While lath can be made of metal and stone, you will most likely encounter wood lath. Wood lath consists of a series of horizontal wood strips, approximately 2 inches wide, with a small gap between each slat.