ANIMAL PHYSIOLOGY
DIGESTION IN HUMANS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Enzymes speed up the rate of chemical reaction.
|
|
|
Enzymes change to a new substance after reaction.
|
|
|
In lock and key hypothesis, key is enzyme.
|
|
|
Enzyme is sensitive to temperature and concentration.
|
Detailed explanation-1: -The answer is enzymes. Enzymes in our bodies are catalysts that speed up reactions by helping to lower the activation energy needed to start a reaction.
Detailed explanation-2: -Answer and Explanation: The answer is A. Enzymes increase the rate of chemical reaction by lowering activation energy barriers. Enzymes are biological catalysts.
Detailed explanation-3: -(i) Enzymes do not alter the overall change in free energy for a reaction. (ii) Enzymes are proteins whose three dimensional shape is key to their functions. (iii) Enzymes speed up reactions by lowering activation energy. (iv) Enzymes are highly specific for reactions.
Detailed explanation-4: -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-5: -Answer and Explanation: In the multiple choice, the truestatement is: Enzyme catalysis D. decreases the change in the free energy of activation..