Question

questions 9 and 10 refer to the following. for the following questions: graphs i - iv depict the effect of ph on the activity of four different hydrolytic enzymes. 10 the most likely explanation for the results shown in graph i is that a ph affects the shape of the active site of the enzyme b ph affects the temperature of the reaction c the enzyme has a quaternary structure d the enzyme has disulfide bonds e ph affects the primary structure of the enzyme

Explanation:

Enzyme activity is highly dependent on the shape of its active - site. pH can alter the ionization states of amino - acid residues in the enzyme, which in turn affects the shape of the active site and thus the enzyme's activity. Temperature is not directly affected by pH in this context. Quaternary structure and disulfide bonds are not the most direct reasons for the pH - activity relationship shown. The primary structure is the amino - acid sequence and is not directly modified by pH in a way that would explain this activity curve as directly as the active - site shape change.

Answer:

A. pH affects the shape of the active site of the enzyme