A plasma membrane is composed of what?

Answer 1

phospholipid bilayer can consists of a phosphate group, gylcerol and 2 fatty acids. It is selectively permeable which means that it only allows certain molecules in and others out. Molecules that are allowed in are those that are small and polar meaning that both molecules have differents charges on them attracting them to each other. The structure of the molecule has 2 hydrophobic tails and a hydrphilic head. the head would be the the one to attach itself to the other molecule because it is polar. in other words the hydrophilic head will turn in the direction of the cell wall because of its polar ways and difference in charges between the two. and the tails would point inward to each other because they are hydrophobic so they would keep as far awat from water as possible and by turning to each other they are doing so. Hydrophobic means water hating/ afraid of water hydrophilic means water loving.

Answer 2

A plasma membrane is a bilayer composed of phospholipids. These phospholipids have hydrophilic head which contains phosphate and glucose. Stemming from the head are two tails of fatty acids, monomers of lipids, and are hydrophobic. These tails bond with other tails from the phospholipids on the other side of the membrane and form one united membrane. The membrane is also studded with various enzymes that help transport things inside and outside of the cell. Carbohydrates usually stem from these enzymes and serve as indicators to other cells, which help cells identify each other.

Pretty much that first sentence is all you need to know, though. (:

Answer 3

A plasma membrane is composed mainly of phospholipid molecules, which are arranged in a double layer called the lipid bilayer. Embedded within this bilayer are proteins that help maintain the structure and function of the membrane. Additionally, there may be other molecules such as cholesterol and carbohydrates present in the plasma membrane.