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.
A macromolecule simply is a larger molecule made of many smaller molecules. There are four types of macromolecules a) Proteins are co â¦ mposed of amino acids b) Carbohydrates are made of sugars c) Nucleic acids are composed of nucleotides. function of a protein macromolecule is: Moving things in and out of cells. Transporting other molecules in the body Protein macromolecule makes up the connective tissue i â¦ n tendons.