Students also form a logical argument about the cause of a color change inside of a dialysis tubing bag. Substances react in characteristic ways with other substances. In this activity, the characteristic reaction of iodine with starch is used to observe the process of smaller iodine molecules moving into the membrane. The physical properties of compounds reflect the nature of the interactions among their molecules. The size of molecules control their interaction with sephadex resin.
Carbon atoms bond to form a variety of structures, including molecules that are essential to life.
Proteins are one class of these biochemical molecules. In the extension, students use blood protein as a source of the macromolecule. Page maintained by Steve Gentle, Research Associate.