MCAT Practice Exam Questions and Answers 2022 Thin layer chromatography can use silica plates which are very polar. Will polar or non polar substances have lower Rf values on this plate? A titrati on of a strong acid with a strong base or vice versa has an equivalence point around what pH? What type of bond is usually disrupted during denaturation of proteins? Is uracil a purine or pyrimidine? Are peptide bonds highly reactive? (T/F): Bomb calorimetery is a good way to determine bond enthalpies ...