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Biology question on enzymes
Choose the👉 “BEST & RIGHT” answers from the following questions .
- An enzyme known as catalase converts Hydrogen peroxide (H²O²) into water (H²O) & oxygen (O²) , in this reaction , which one is the substrate ?
A. Catalase
B. Hydrogen peroxide
C. Water & oxygen
D. Water
- Which one of the following classes of enzymes digests carbohydrates ?
A. Amylases
B. Lipases
C. Proteases
D. Nucleases
- Identify the statement that more correctly explains why each cell contains so many different types of enzymes? Enzymes are ……..
A. Consumed in the process of catalysis .
B. Used over & over again .
C. Specific to their substrates.
D.Easily synthesised in the cell.
- W\c of the following properties of enzymes make it possible that a single enzyme molecule can act on many substrate molecules ?
A. Enzymes are proteins.
B. Enzymes lower the energy of activation.
C. Enzymes are reused over & over again .
D. Enzymes are specific .
- Enzymes in our body generally have ….
A. Same pH & same optimum temperature.
B. Same pH but different optimum temperature.
C. Different pH but same optimum temperature.
D. Different pH & different optimum temperature.
- W\c of the following statements regarding coenzymes is incorrect ?
A. Every coenzyme is a cofactor & every cofactor is a coenzyme .
B. Every coenzyme is a cofactor but every cofactor is not coenzyme .
C. Most coenzymes are nucleotides & are composed of vitamins.
D. Coenzymes are the Active constituents of enzymes.
- In w\c of the following points does the induced fit model of enzyme action differ from the lock & key model ?
A. Enzyme lowers the energy of activation.
B. Substrate binds at the active site of the enzyme.
C. During the reaction an enzyme substrate complex is formed.
D. The shape of the substrate & the active site are complementary .
- What is the dependent variable in testing the effect of temperature on enzyme activity ?
A. Enzyme
B. Temperature
C. Rate of reaction
D. Time
- In competitive inhibition , w\c one of the following factors determines the rate of the inhibition ?
A. The reaction temperature
B. The enzyme concentration
C. The substrate concentration
D. The ratio of the inhibitor to enzyme concentration.
10 . Enzymes involved in feedback inhibition are called …..
A. Allosteric enzymes
B. Coenzymes
C. Holo-enzymes
D. Apoenzymes
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Biology Brief explanation for each questions above 👆👆
- Catalase is an enzyme that coverts H²O² (substrate) in to H²O & O² ( products ) .
I.e, the substrate is H²O²
Therefore, The answer is B - amylase digest carbohydrates , lipase acts on lipids, protase on proteins & nuclease digest nucleic acids
Therefore, The answer is A - Because enzymes are specific in their action, so cells need to have different types of enzymes for each type of Substrate .
Therefore, The answer is C - It is for the reason that enzymes can be reused over and over again that a single enzyme can act upon many substrates .
Therefore, The answer is C - Enzymes secreted & functioning in an organism generally works under the same temperature but different pH .
Therefore, The answer is C - Cofactors include coenzymes, prosthetic groups & metal ions . Most of coenzymes are nucleotides and are composed of vitamins .
Therefore , The answer is A - According to induced fit model the active site doesn’t have a rigid lock & key confirmation . The binding of the substrate molecule to the enzyme molecule induces to modify the shape of the active site so that it becomes complementary to the substrate molecule .
Therefore, The answer is D - In the given condition , temperature is the independent variable whereas the rate of reaction is the dependent variable .
Therefore , The answer is C
9. Competitive enzyme inhibitors work by preventing the formation of enzyme-substrate complex b\c they have a similar shape to the substrate molecule . This means that the level of inhibition depends on the competing for places in enzyme active sites.
Therefore, The answer is C
10 . Allosteric enzymes contain allosteric site in addition to the active site. the binding of a non substrate molecule to the allosteric site functions to influence the activity of an enzyme . In a metabolic pathway allosteric enzymes can be inhibited by end product of their reactions , resulting in feedback inhibition . Holo-enzyemes are combinations of apoenzyme & cofactors .
Therefore , The answer is A
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