7.2 Proteins in the cell and on its surface receive signals from other cells. â¢ There are usually several amplifying steps betweenthe binding of a signal molecule to a cell surfacereceptor and the response of the cell.ecause these proteins may constituteless than 0.01% of the total mass of protein in a cell, puri-fying them is analogous to searching for a particular grainof sand in a sand dune! However, two recent techniqueshave enabled cell biologists to make rapid progress in thisarea. 7.1 Cells signal one another with chemicals.
A macromolecule is a very large molecule commonly created by polymerization of smaller subunits (monomers). They are typically composed of thousands or more atoms.
Macromolecules in foods What are 'macromolecules'? Macro --> Large ; + Molecules = Large Molecules Macromolecules are molecules containing a large number of atoms. formed by a process known as polymerization (compounds are built by joining smaller ones together) smaller units (monomers) joined together to form polymers.