9th Class Biology Chapter 7 Online MCQ Test With Answers PDF (Bioenergetics)

Biology 9th Class Urdu Medium Chapter 7 Online Test

Sr. #	Questions	Answers Choice
1	The biochemical reactions in which larger molecules are synthesized are called.	Anabolism Catabolism Metabolism Digestive reactions
2	The biochemical reactions in which larger molecules are synthesized are called.	Catabolism Metabolism Anabolism Digestive rections
3	Set of biochemical reactions that occur in living organisms in order to maintain life is called.	Catabolism anabolism Metabolism Mutualism
4	What is TRUE . according to the induced fit model of enzyme action.	Enzyme's active site change shape to bind the substrate. Substrate must fit the enzyme perfectly before binding No shape changes occur durring binding Enzyme is inactivated during the process.
5	An enzyme works best at a pH of 7.4. It is places in an acidic solution with a pH of 4.0.How will this affect the enzyme.	The substrate will become inactive in an acidic environment the enzyme wil gain additional active sites The enzyme will catalyse reactions faster due to increased H ions The activ esite will be modified reducing substrate binding
6	How does competitive inhibitor affect enzyme action	attaches with the substrate Changes enzyme shape Attaches and blocks the active site Blocks the cofactors
7	How does increasing temperatue affect enzyme activity.	Increase actiity to a point Always decreases activity Makes enzymes non functional No effect on enzyme
8	Prosthetic groups are.	Required by all enzymes Protins in nature Tightly bound to enzyme Loosely attached with enzymes
9	Enzyme are specific in their action becasue.	Their active sites fit specific substaratres They are alwyas proteins They are consumed in reactions They work only at high temperatures
10	What can happen if an enzyme is exposed to temperature that is highr than its optimal temperature.	Enzyme activity rate will increase Enzyme's shape will change potentially reducing its activity Enzyme will speed up the reaction and remain stable Enzyme will become a substrate itself
11	Which best defines an enzyme.	A chemical that breaks down food A hormone that regulates metabolism A protein that speeds up reactions A molecule that stores energy
12	Primarily, all enzymes are.	Proteins Nucleic acids Carbohydrates Lipids

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