BIOLOGY
ENZYMES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Enzyme activity depends on the number of successful collisions between the enzyme and substrate
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Most enzymes are not sensitive to temperature
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Extremes of pH are unlikely to denature an enzyme
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None of the above
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Detailed explanation-1: -Higher temperature generally causes more collisions among the molecules and therefore increases the rate of a reaction. More collisions increase the likelihood that substrate will collide with the active site of the enzyme, thus increasing the rate of an enzyme-catalyzed reaction.
Detailed explanation-2: -Enzymes are biological catalysts which speed up biochemical reactions. According to the most widely accepted theory, enzymes bind to the substrate molecule and form a transition state. During the progress of a reaction the substrates are separated from products by an energy barrier which the substrates need to cross.
Detailed explanation-3: -Enzymes change shape to fit their substrate.: TRUE: The active site can change shape to more tightly bind with the substrate and catalyze the reaction known as induced fit.
Detailed explanation-4: -Enzyme activity can be affected by a variety of factors, such as temperature, pH, and concentration. Enzymes work best within specific temperature and pH ranges, and sub-optimal conditions can cause an enzyme to lose its ability to bind to a substrate.