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The average pH inside part of the small intestine is about 6.5. The activity levels of four enzymes at various pH ranges are shown in the table.

\begin{tabular}{|l|l|l|l|l|}
\hline
\multicolumn{1}{|c|}{pH range} & \multicolumn{1}{|c|}{Enzyme I activity} & \multicolumn{1}{|c|}{Enzyme II activity} & \multicolumn{1}{|c|}{Enzyme III activity} & \multicolumn{1}{|c|}{Enzyme IV activity} \\
\hline
[tex]$2-4$[/tex] & Inactive & Inactive & High & Low \\
\hline
[tex]$4-6$[/tex] & Inactive & Low & Low & High \\
\hline
[tex]$6-7$[/tex] & Low & High & Inactive & Low \\
\hline
[tex]$7-9$[/tex] & High & Low & Inactive & Inactive \\
\hline
[tex]$9-11$[/tex] & Low & Inactive & Inactive & Inactive \\
\hline
\end{tabular}

Based on the information shown, which enzyme would work best in the small intestine?

A. Enzyme I
B. Enzyme II
C. Enzyme III
D. Enzyme IV



Answer :

GinnyAnswer
To determine which enzyme would work best in the small intestine, we need to consider the pH range in which the enzyme displays the highest activity. The average pH of the small intestine is about 6.5.

Given the table of enzyme activities:

[tex]\[ \begin{array}{|c|c|c|c|c|} \hline \text{pH range} & \text{Enzyme I activity} & \text{Enzyme II activity} & \text{Enzyme III activity} & \text{Enzyme IV activity} \\ \hline 2-4 & \text{Inactive} & \text{Inactive} & \text{High} & \text{Low} \\ \hline 4-6 & \text{Inactive} & \text{Low} & \text{Low} & \text{High} \\ \hline 6-7 & \text{Low} & \text{High} & \text{Inactive} & \text{Low} \\ \hline 7-9 & \text{High} & \text{Low} & \text{Inactive} & \text{Inactive} \\ \hline 9-11 & \text{Low} & \text{Inactive} & \text{Inactive} & \text{Inactive} \\ \hline \end{array} \][/tex]

The relevant pH range for the small intestine (pH = 6.5) would be "6-7". We will examine the activities of each enzyme within this pH range:

- Enzyme I: Low activity
- Enzyme II: High activity
- Enzyme III: Inactive
- Enzyme IV: Low activity

From this analysis, Enzyme II shows high activity in the pH range of 6-7, which corresponds to the average pH of the small intestine (6.5).

Therefore, the enzyme that would work best in the small intestine is:

B. Enzyme II

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