ANIMAL PHYSIOLOGY
GAS EXCHANGE IN HUMANS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Temperature increases the reaction rate of respiration
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Germinating seeds will not respire at room temperature
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Temperature increases the reaction rate until the enzymes are irreversibly denatured and the reaction stops
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All reactions will occur at all temperatures
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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: -Like most chemical reactions, the rate of an enzyme-catalyzed reaction increases as the temperature is raised. A ten degree Centigrade rise in temperature will increase the activity of most enzymes by 50 to 100%.
Detailed explanation-3: -Answer and Explanation: The correct option is (a). Enzyme reaction rates are increased by increasing temperature until they reach the point of denaturation at 40-60 degree Celcius.
Detailed explanation-4: -Because enzymes are proteins, they are denatured by heat. Therefore, at higher temperatures (over about 55°C in the graph below) there is a rapid loss of activity as the protein suffers irreversible denaturation.