text: One protein required for a type of this process contains a DDE motif of three acidic residues.
full_question: One protein required for a type of this process contains a DDE motif of three acidic residues. Molecules with zirconium or titanium centers are alkylated before their methyl groups are abstracted by methylaluminoxane to form catalysts for this process. Products of this process are dissolved in a solution which is then placed on a salt cell and evaporated to form a film in IR spectroscopy. One important “ceiling” describing this process is calculated by setting the change in Gibbs free energy equal to zero and solving for that parameter at which equilibrium is achieved. Benzoyl peroxide breaks into two free radicals in the beginning of one type of this process. In this process, active sites must be transferred from one molecule to another through propagation before termination occurs. For ten points, name these reactions which come in chain growth and step growth varieties.
first_sentence: One protein required for a type of this process contains a DDE motif of three acidic residues.