Final answer:
The Henderson-Hasselbalch equation can be used to find the percentage of deprotonated cysteinyl side chains at pH 7.4.
Step-by-step explanation:
The Henderson-Hasselbalch equation is used to determine the ratio of conjugate acid to conjugate base in a buffer solution.
For cysteinyl side chains, the Henderson-Hasselbalch equation can be used to find the percentage of deprotonated molecules at pH 7.4.
The equation is:
pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the deprotonated form and [HA] is the concentration of the protonated form.
By substituting the values into the equation, we can calculate the percentage of deprotonated cysteinyl side chains at pH 7.4.