| A | B |
|---|
| Measure of hydrophobicity— | free energy required to transfer each segment of a polypeptide from nonpolar to polar solvent |
| Porins | Transmembrane domains composed of β- strands |
| Lipid-Anchored Proteins | Covalently attached to lipids |
| Peripheral Membrane Proteins | Non-covalently associated with hydrophilic heads of outer or inner leaflet and Important structural proteins |
| Membrane Carbohydrates | Carbohydrate residues linked to lipids and proteins, Mediate, Carbohydrate moieties of lipids and proteins always face toward |
| Carbohydrate residues linked to lipids and proteins | Short chains and Varied residues |
| Mediate | interactions between cell and environment and Sorting of proteins to cellular compartments |
| Carbohydrate moieties of lipids and proteins always face toward | the extracellular space on plasma membrane and the intra-organelle space |
| Movement Across Membranes | Simple diffusion and Protein-mediated movement |
| Transport Proteins | Transport hydrophilic molecules and Integral membrane proteins and Can move molecules down or against chemical and electrical gradients |
| Uniport Transport | Glucose via GLUT transporters and Water via aquaporins |
| Km (Michaelis constant) | is measure of affinity of receptor for substrate |
| Km is molarity at which half | of transporter sites are occupied by substrate |
| The smaller the Km, the greater | the affinity for substrate and transporter site |
