Cooperativity is a feature of allosteric systems, but not all cooperative binding interactions involve allostery. TRUE FALSE A system is considered 'ultrasensitive' if the output response occurs over an ~100-fold range of input signal strength. TRUE FALSE .An important aspect of phosphor-peptide recognition by SH2 domains is an invariant aspartate side chain that has favorable interactions with the negatively charged phosphate group on the peptide. TRUE FALSE . When considering the mechanism of protein-ligand binding, the concept of conformational capture suggests that the conformation of the protein required for ligand binding exists as one of many nearly isoenergetic conformational states. TRUE FALSE