Cells have proteins called receptors that bind to signaling molecules and initiate a physiological response. Different receptors are specific for different molecules. Dopamine receptors bind dopamine, insulin receptors bind insulin, nerve growth factor receptors bind nerve growth factor, and so on.hosphate groups can be added to multiple sites in a single protein, and a single protein may in turn be the substrate for multiple kinases and phosphatases. At any one time, a cell is receiving and responding to numerous signals, and multiple signal transduction pathways are operating in its cytoplasm.
Definition of macropore. : a pore (as in coal) of comparatively large size; especially : a pore in soil of such size that water drains from it by gravity and is not held by capillary action.
CH 5. Structure & Function of Large Molecules: Macromolecules. Molecules of Life. All living things are made up of four classes of large biological molecules: carbohydrates, lipids, proteins, and nucleic acids. Macromolecules are large molecules composed of thousands of covalently connected atoms. Molecular structure and function are inseparable. Macromolecules: Polymers built from Monomers A polymer is a long molecule consisting of many similar building blocks. These small building-block molecules are called monomers. Three of the four classes of lifeâs organic molecules are polymers: Carbohydrates Proteins Nucleic acids Synthesis & Breakdown of Polymers A dehydration reaction occurs when two monomers bond together through the loss of a water molecule.