a
the optimum temperature is attained
b
the ph of the medium is altered
c
there is an increase in substrate concentration
d
the atmospheric pressure is altered
Explanation
Correct Option
bNo explanation available
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Derek644222
2 years ago
An enzyme reaction may begin to decline when B. the pH of the medium is altered. Enzymes have an optimal pH at which they function most effectively. When the pH deviates from this optimal range, it can denature the enzyme and reduce its activity, leading to a decline in the reaction rate. Changes in temperature, substrate concentration, or atmospheric pressure may also affect enzyme activity, but altering the pH is specifically known to have a significant impact.
so option B is correct 
