What is a membrane domain?
Lipid rafts were originally defined as membrane domains, i.e., ordered structures created as a consequence of the lateral segregation of sphingolipids and differing from the surrounding membrane in their molecular composition and properties.
What are the names of the two plasma membrane domains?
Consequently, the plasma membranes of many epithelial cells are divided into distinct apical and basolateral domains that differ in function and protein composition (Figure 12.12).
What is the Tm of a membrane?
The tympanic membrane (TM), also known as the ear drum, is located between the ear canal and the middle ear. Normally it completely separates these two spaces, preventing air or fluid from moving across these two spaces.
What are 3 key proteins embedded in the plasma membrane?
The three main types of proteins embedded in the cell membrane are receptors, channels and markers. Explain the function of each.
What is a membrane spanning domain?
Transmembrane domains (TMDs) consist predominantly of nonpolar amino acid residues and may traverse the bilayer once or several times. A length of helix of 18–21 amino acid residues is sufficient to span the usual width of a lipid bilayer (Fig.
What is the Golgi apparatus function?
A Golgi body, also known as a Golgi apparatus, is a cell organelle that helps process and package proteins and lipid molecules, especially proteins destined to be exported from the cell.
What feature of the plasma membrane contributes to its fluidity?
The mosaic nature of the membrane, its phospholipid chemistry, and the presence of cholesterol contribute to membrane fluidity.
What is flexing of hydrocarbon chains?
flexing of hydrocarbon chains. a. There are two properties of phospholipids that affect how tightly they pack together: the length of the hydrocarbon chain and the number of double bonds. The degree of packing, in turn, influences the relative mobility of these molecules in the membrane.