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

Question # 1

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 # 2

What happens to an enzyme when it is frozen below 0 oC?

Ans 1: At very low temperature enzyme remain inactive due to fall in availabel activation energy.

Question # 3

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 # 4

Why enzymes are called biological catalyst.

Ans 1: Enzymes are known as biocatalysts because they speed up ad regulate the metabolic pathways in living organisms. Enxymes are mostly proteins that catalyze a chemical reaction in our body. They function as a catalyst that speed up th reaction by lowering the activation energy.

Question # 5

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 # 6

How does pH affect enzyme activity.

Ans 1: Enzymes are sensitive to hydrogen ion concentration of he fuid in which they work. They show maximum acticity at a speecific pH. called their optimum pH.

Question # 7

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 # 8

Which type of enzyme inhibitors inhibit the enzymes without attaching to the active site.

Ans 1: Non-competitive inbibitors do not attache to the active site of an enxyme. Rather, they attach to some other locationof enzyme.

Question # 9

What do you mean by Optimum pH.

Ans 1: Optimum pH is a measure of how acidic or basic a substance or solution is . It is neasured on pH scale of 0 to 14 with 7 being nautral.
Enzymes show maximum aactivity at a specific pH. called their optimum pH

Question # 10

Define co -factors.Give two example.

Ans 1: Some enxymes require non -Protein molecules or ions to work, these molecules or ions are called cofactors. Co factors can either be inorganic e.g metal ions or organic e.g. Flavin and haem.

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Online Short Questions For Chapter 7 "9th Class Biology Urdu Medium Chapter 7 Preparation "

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

Define an enzyme. What is its role in metabolism.

What happens to an enzyme when it is frozen below 0 oC?

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

Why enzymes are called biological catalyst.

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.

How does pH affect enzyme activity.

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

Which type of enzyme inhibitors inhibit the enzymes without attaching to the active site.

What do you mean by Optimum pH.

Define co -factors.Give two example.

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

Define an enzyme. What is its role in metabolism.

What happens to an enzyme when it is frozen below 0 oC?

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

Why enzymes are called biological catalyst.

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.

How does pH affect enzyme activity.

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

Which type of enzyme inhibitors inhibit the enzymes without attaching to the active site.

What do you mean by Optimum pH.

Define co -factors.Give two example.

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

Which protein digestign enxyme functions in acidic medium?

Difference between Intractellular and extracellular enzymes.

Describe lock and key model of enzyme action.

What do you mean by Optimum pH.

Name the factors affecting enzyme activity.

What do you mean by Optimum Temperature

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

Define co -factors.Give two example.

How does pH affect enzyme activity.

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.

9th Biology Urdu Medium Chapter 7 Preperation

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