Biology 9th Class Chapter 7(Bioenergetics) Online Short Questions with Answers Preparationj

Question # 1

Describe lock and key model of enzyme action.

Ans 1: Emil Fischer proposed the lock and key model of enzyme action. The active site has particulr rigid shape into which the specific substrate fits exacely. The substrate is imagined being like a key whose shape is complementary to the enzyme or lock. Once the product is formed no longer fits into the active site nand escapes into the surrounding medium. The active site is free to combine again with another substrate molecule.

Question # 2

What is teh active site of enzyme? State its importance in enxyme speciaficity.

Ans 1: Only a small portion of enzyme molecule is directly involved in catalysis. This catalytic region is known as active site. It recognizes and binds substrates and then carries out biochemical reactions.

Question # 3

Define Metabolism. Difference between catabolism and anabolism.

Ans 1: Metabolism:
Metabolism is the sum of all chemical reactions that occur with an organism to sustain life.
Ans 2: Catabolism :
Dfine:
It involves the breakdown of complex molecules into simpler ones, releasing energy in the process.
Example:
Cellular respiration i.e. oxidation of food into CO2 and H2O to get energy
Lipolysis i.e. break-down of lipids into fatty acids and glycerol, which can be used for energy production.
Ans 3: Anabolism:
Define: Involves building up complex molecules from simpler ones, thsi process consumes energy.
Example:
i. Photosynthesis i.e. conversion of carbon dioxide and water into glucose andoxygen using sunlight.
ii. Protein syntesis i.e. formation of proteins form amino acids, which are vital for cell structure and function.

Question # 4

Which type of metabolism demands input of energy. Give an examples

Ans 1: Anabolism demands input of energy photosyntheiss. i.e., conversion of carbon dioxide and water into glucose and oxygen using sunlight.

Question # 5

Why are enxyme specific and why can't each one speed up many different reactions.

Ans 1: Each enzyme is specific to a chemicla reaction as it contains an active site which is the area of an enzyme that has specific shape which differs from one enxyme to another.

Question # 6

What do you mean by saturation of active sites.

Ans 1: When all the active sites of the enzymes are occupied and adding more substrate molecule do not find free active siges, this state is called saturation of active sites and the reaction rate does not increase.

Question # 7

According to induced fit model. the active site is flexible. Does it mean that any substrate can attach with this flexible active site? If not , then explain.

Ans 1: Enzymes are very specific for the substrate. One enzyme can act on a particular substrate because ative sites posses specific geometric shapes that fit with specific substrates, According to induced fit model, the active site is slightly flexible but not flexible enough that any substrate can attach with active site.

Question # 8

Define an enzyme. What is its role in metabolism.

Ans 1: Define: Enzymes are biologicla catalysts that speed up chemical reactions in living organisms without being consumed in the process. They ar eprimarily proins and highly specific to their substrates.
Ans 2: Role:Enzymes play an important role in controlling cellular metaboiism. An enzyme function sby lowering the activation enery of a chemicla reaction inside the cells. Activation enery is the minimum amount of energy needed to from or break chemical bounds and convert reactants to products.

Question # 9

Provide two examples of enzymes that operate optimally at specific pH.

Ans 1: Pepsin work in acidic medium trypsin works in alkaline medium.

Question # 10

Write affect of change of pH

Ans 1: Change in pH can affect the ionization of the amino acids t the active site down enzyme activity o blocks it comletely. Differente enzymes have differente optimum pH values. For example, Pepsin works in acidic medium while trypsin works in alkaline medium.

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Biology (New Book) - 9th Class Biology Urdu Medium Chapter 7 Preparation

Describe lock and key model of enzyme action.

What is teh active site of enzyme? State its importance in enxyme speciaficity.

Define Metabolism. Difference between catabolism and anabolism.

Which type of metabolism demands input of energy. Give an examples

Why are enxyme specific and why can't each one speed up many different reactions.

What do you mean by saturation of active sites.

According to induced fit model. the active site is flexible. Does it mean that any substrate can attach with this flexible active site? If not , then explain.

Define an enzyme. What is its role in metabolism.

Provide two examples of enzymes that operate optimally at specific pH.

Write affect of change of pH

Prepare Complete Set Wise Questions For Chapter 7 "9th Class Biology Urdu Medium Chapter 7 Preparation "

Set 1

Set 2

9th Class Biology Urdu Medium Chapter 7 Preparation - Set 1

Describe lock and key model of enzyme action.

What is teh active site of enzyme? State its importance in enxyme speciaficity.

Define Metabolism. Difference between catabolism and anabolism.

Which type of metabolism demands input of energy. Give an examples

Why are enxyme specific and why can't each one speed up many different reactions.

What do you mean by saturation of active sites.

According to induced fit model. the active site is flexible. Does it mean that any substrate can attach with this flexible active site? If not , then explain.

Define an enzyme. What is its role in metabolism.

Provide two examples of enzymes that operate optimally at specific pH.

Write affect of change of pH

9th Class Biology Urdu Medium Chapter 7 Preparation - Set 2

According to induced fit model. the active site is flexible. Does it mean that any substrate can attach with this flexible active site? If not , then explain.

What do you mean by Optimum Temperature

Difference between Intractellular and extracellular enzymes.

Which protein digestign enxyme functions in acidic medium?

Why are enxyme specific and why can't each one speed up many different reactions.

Name the factors affecting enzyme activity.

What do you mean by Optimum pH.

Define an enzyme. What is its role in metabolism.

Provide two examples of enzymes that operate optimally at specific pH.

What is teh active site of enzyme? State its importance in enxyme speciaficity.

9th Biology Urdu Medium Chapter 7 Preperation

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