Cysteine proteases work on the similar principle as shown by serine proteases. Cysteine proteases use a thiol group, which is activated by its proximity to a histidine
residue. Therefore, these enzymes have a catalytic diad, not triad as in serine proteases. Propose a mechanism for cysteine protease action on peptide substrate through formation of the acyl-enzyme intermediate (Stop at this point).​

the volume of fluid displaced would equal the volume of the gas. use a gas syringe - this is a laboratory instrument that can be used to withdraw a certain volume of gas from a closed system or to measure the volume of gas from a chemical reaction.

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?