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

Question # 1

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 # 2

Difference between competitive and non competitive inhibition.

Ans 1: Competitive Inhibition:Some inhibitiors resemble the enxyme's substrate They compete with the substrate to attach to the active site of enxyme. Whe the inhibitor is attached to the active site. It blocks it and oes not allow the substrate to attach.Example:Examples of competitive inhibitors are antibioties. The antibiotic molecules compete with the substrates of bacterial enzymes. They attach to bacterial enzymes and inhibit them.
Ans 2: Non-Competivive inhibition : Some enxyme inhibitio do not have similarity to the substrate. They do not attach to the active site of enxyme. Rather they attach to some other location of enzyme. This attachement change sthe overall shape of enzyme and active site. so, this changed activ esite does not fit substrate and enxyme is inhibited Example: Heavy mtals like ercury and certain drugs used in cancer therapy.

Question # 3

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 # 4

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 # 5

Difference between Intractellular and extracellular enzymes.

Ans 1: Intracellular enzymes.:
Enzymes which remain inside the cell to speed up the reaction are called intracellular enzymes.
Example:
Enzymes of glycolysis working in cytoplasm.
Ans 2: Extractellular enzymes:
Enzymes that work outside the cell are called extracellular enzymes.
Example:
Pepsin enxyme working in he stomach cavity

Question # 6

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 # 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

Provide an example of a specific enzyme substrate pair.

Ans 1: The enxyme protease will not work on starh which is broken down by an enzyme amylase.

Question # 9

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 # 10

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.

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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

What do you mean by saturation of active sites.

Difference between competitive and non competitive inhibition.

Define an enzyme. What is its role in metabolism.

How does pH affect enzyme activity.

Difference between Intractellular and extracellular enzymes.

What do you mean by Optimum pH.

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.

Provide an example of a specific enzyme substrate pair.

Why enzymes are called biological catalyst.

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

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

What do you mean by saturation of active sites.

Difference between competitive and non competitive inhibition.

Define an enzyme. What is its role in metabolism.

How does pH affect enzyme activity.

Difference between Intractellular and extracellular enzymes.

What do you mean by Optimum pH.

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.

Provide an example of a specific enzyme substrate pair.

Why enzymes are called biological catalyst.

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

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

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

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

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

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 saturation of active sites.

Define co -factors.Give two example.

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

Difference between competitive and non competitive inhibition.

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

Why enzymes are called biological catalyst.

9th Biology Urdu Medium Chapter 7 Preperation

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