molecular identification tags such as phosphate group added to the Golgi prouducts aid in sorting by acting like ZIP codes on mailing labels.
Biology 8TH EDITHION ( CAMPBELL ET. AL 2008)
Carbohydrates
Proteins are large biological molecules consisting of one or more chains of amino acid residues.
Proteins and lipids
Micromolecules are larger molecules joined together by smaller organic molecules .
The phenomena of formation of large carbon compounds by the addition of small molecules is called polymerization and the molecules are come under macromolecules as they possess molecular weight several to hundred thousands
Oxygen passes through the membrane by diffusion. Most other molecules must be transported (carried) across by proteins which reside within the cell membrane.
Carbohydrates
proteins
Usually proteins are the molecules doing the selection of what other molecules get into or out of a cell.
when proteins help molecules move across the membrane, it it called Facilitated Diffusion
Channel proteins, a type of transport proteins to the cells, move molecules from outside of the membrane to the inside
Globular proteins.
A cell membrane is made up of lipids (the lipid bilayer) was well as glycoprotiens and glycocalyses. The proteins can be on either or bothe sides of the lipid bilayer, allowing for various types of transport through the "semi-permeable membrane." The proteins on the surface may be used for identification purposes.
Protein molecules are responsible for membrane transport. In passive transport diffusion is the phenomenon in which molecules flow naturally from areas of high concentration to lower concentrations.
Proteins
this is the cell membrane made primarily of lipid molecules with proteins incorporated into it that aid in transport of molecules across the membrane
Membrane proteins have a variety of functions. They relay signals between the cell's inside and outside environments. Transport proteins move the molecules across the membrane.
There are two main roles of the membrane proteins. Membrane proteins act as channels across the lipid bilayer. They also act as carrier molecules that transfer substances across the membrane.