Types of Compounds. Ionic compounds are compounds composed of ions, charged particles that form when an atom (or group of atoms, in the case of polyatomic ions) gains or loses electrons. 1  A cation is a positively charged ion. 2  An anion is a negatively charged ion.
Porins are members of an extended family of transmembrane proteins found in the outer membrane of gram negative bacteria such as E. coli, or in the outer membranes of mitochondria in eukaryotes. The general porins provide a simple diffusion pathway across the membrane for molecules less than 1 kDa with little substrate selectivity.
Lesson Summary. The group known as globular proteins is one of the three main protein groups based on shape and structure. All globular proteins are water-soluble, with their tertiary level of structure often resembling a globe or sphere.This 'globular' folded shape is crucial to the function of these proteins and their ability to serve a variety of biological roles. To unlock this lesson you must be a Study.com Member.lobular proteins are folded such that their tertiary structure consists of the polar or hydrophilic amino acids arranged on the outside and the nonpolar or hydrophobic amino acids on the inside of the three-dimensional shape.