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

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

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

Question # 1

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 # 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.

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 # 3

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 # 4

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 # 5

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 # 6

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.

Question # 7

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 # 8

Name the factors affecting enzyme activity.

Ans 1: 1) Temprature
2) Substrate Conscentration.
3) pH

Question # 9

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.

Question # 10

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.

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

Set 1

10 Questions
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Set 2

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

Question # 1

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 # 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.

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 # 3

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 # 4

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 # 5

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 # 6

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.

Question # 7

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 # 8

Name the factors affecting enzyme activity.

Ans 1: 1) Temprature
2) Substrate Conscentration.
3) pH

Question # 9

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.

Question # 10

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.

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

Question # 1

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.

Question # 2

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 # 3

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 # 4

Why small quantity of enzyme is engough for catalysing large number of substrate molecules into products.

Ans 1: Because enxymes have high capability to conert giant quantities of substrate into product. Enxymes increase the ate of reactionand remain unaffected by reaction which is being gatalyzed.

Question # 5

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

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

Question # 6

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 # 7

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.

Question # 8

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 # 9

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 # 10

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

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9th Class English Medium Subjects

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

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.

Why enzymes are called biological catalyst.

What do you mean by Optimum pH.

Difference between competitive and non competitive inhibition.

Write affect of change of pH

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

Name the factors affecting enzyme activity.

Define co -factors.Give two example.

Describe lock and key model of enzyme action.

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

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.

Why enzymes are called biological catalyst.

What do you mean by Optimum pH.

Difference between competitive and non competitive inhibition.

Write affect of change of pH

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

Name the factors affecting enzyme activity.

Define co -factors.Give two example.

Describe lock and key model of enzyme action.

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

Write affect of change of pH

Describe lock and key model of enzyme action.

Why enzymes are called biological catalyst.

Why small quantity of enzyme is engough for catalysing large number of substrate molecules into products.

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

Define Metabolism. Difference between catabolism and anabolism.

Define co -factors.Give two example.

Difference between competitive and non competitive inhibition.

Provide an example of a specific enzyme substrate pair.

Difference between Intractellular and extracellular enzymes.

9th Biology Urdu Medium Chapter 7 Preperation

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