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(A) The graph shows a bell-shaped curve,which is characteristic of the effect of $pH$ or temperature on enzyme activity.Enzyme activity increases with

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Enzyme activity $-$ $pH$

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(A) The graph shows a bell-shaped curve,which is characteristic of the effect of $pH$ or temperature on enzyme activity.Enzyme activity increases with an increase in $pH$ or temperature up to an optimum point and then decreases as the enzyme gets denatured.In contrast,the effect of substrate concentration on enzyme activity typically shows a hyperbolic curve,where activity increases and then plateaus (reaches $V_{max}$).Looking at the options,both $A$ and $D$ represent bell-shaped curves (Enzyme activity vs $pH$ or Temperature).However,in standard textbook representations,$pH$ is often plotted on the $X$-axis and enzyme activity on the $Y$-axis for this specific bell-shaped curve pattern.Therefore,$X$-axis represents $pH$ and $Y$-axis represents enzyme activity.

The given graphical representation relates to enzyme activity under three conditions ($pH$,temperature,and substrate concentration). What do the given axes $X$ and $Y$ represent?
$X$-axis $-$ $Y$-axis

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The given graphical representation relates to enzyme activity under three conditions ($pH$,temperature,and substrate concentration). What do the given axes $X$ and $Y$ represent?$X$-axis $-$ $Y$-axis