Types Of Enzymes! Trivia Questions Quiz

By Kar
Kar, Assistant Professor (Biochemistry)
Karthikeyan Pethusamy is an assistant professor in the Department of Biochemistry at the All India Institute of Medical Sciences in New Delhi
Quizzes Created: 33 | Total Attempts: 43,655
, Assistant Professor (Biochemistry)
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Types Of Enzymes! Trivia Questions Quiz - Quiz


Are you acquainted with the different types of enzymes? Would you be willing to take this quiz? For this quiz, you will be required to comprehend which class synthetase enzymes belong to, what is a coenzyme, what is true and false about enzymes, what does high km value indicate, which is the fastest enzyme, and what is a committed step of a reaction. This quiz is all about enzymes. Give it a go.


Questions and Answers
  • 1. 

    Which one is not an enzyme used for MI diagnosis?

    • A.

      ALT

    • B.

      AST

    • C.

      LDH

    • D.

      Troponin T

    Correct Answer
    D. Troponin T
    Explanation
    Troponin T is not an enzyme!

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  • 2. 

    Synthetase enzymes belong to this enzyme class.

    • A.

      4

    • B.

      6

    • C.

      3

    • D.

      2

    Correct Answer
    B. 6
    Explanation
    Ligases - class 6 (OTH LIL)

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  • 3. 

    Coenzyme for Mitochondrial Glycerol-3-phosphate dehydrogenase is 

    • A.

      NAD

    • B.

      FAD

    • C.

      NADP

    • D.

      None of the above

    Correct Answer
    B. FAD
    Explanation
    Read G-3-P and Malate aspartate shuttle.
    Know the 4 Souces of NADPH + H+ and FADH2

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  • 4. 

    Abzymes are

    • A.

      Antibodies against enzymes

    • B.

      Antibodies that can function as enzymes

    • C.

      Either of the above

    • D.

      None of the above

    Correct Answer
    B. Antibodies that can function as enzymes
    Explanation
    Abzymes are antibodies that can function as enzymes. Unlike typical antibodies, which bind to specific antigens to neutralize them, abzymes have the additional ability to catalyze chemical reactions. This dual functionality makes abzymes unique and valuable in various medical and industrial applications. They can be engineered to have specific enzymatic activities, allowing them to perform tasks such as breaking down toxins or pathogens. Therefore, the correct answer is "Antibodies that can function as enzymes."

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  • 5. 

    EC  number 1.1.1.1 denotes

    • A.

      Alcohol dehydrogenase

    • B.

      Aldehyde dehydrogenase

    • C.

      Lactate dehydrogenase

    • D.

      Pyruvate dehydrogenase

    Correct Answer
    A. Alcohol dehydrogenase
    Explanation
    EC number 1.1.1.1 denotes Alcohol dehydrogenase. This enzyme is responsible for the conversion of alcohols to aldehydes or ketones by utilizing NAD+ as a cofactor. It plays a crucial role in the metabolism of alcohol in the body, breaking down ethanol into acetaldehyde. Alcohol dehydrogenase is found in various tissues, including the liver, where it is primarily involved in the detoxification of alcohol.

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  • 6. 

    False about enzymes

    • A.

      Enzymes increases the rate of the reaction

    • B.

      Enzymes alter the equilibrium towards forward reaction

    • C.

      Enzymes reduces the activation energy

    • D.

      Some enzymes are highly specific for a single substrate

    Correct Answer
    B. Enzymes alter the equilibrium towards forward reaction
    Explanation
    Enzymes do not alter the equilibrium towards the forward reaction. Enzymes are catalysts that speed up the rate of a reaction by reducing the activation energy required for the reaction to occur. They do not change the position of the equilibrium or favor the forward reaction. Instead, they facilitate the conversion of reactants to products at a faster rate.

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  • 7. 

    High Km Value indicates

    • A.

      Low affinity towards substrates

    • B.

      High affinity towards substrates

    • C.

      Either of the above

    • D.

      None of the above

    Correct Answer
    A. Low affinity towards substrates
    Explanation
    A high Km value indicates low affinity towards substrates because Km is a measure of the substrate concentration at which the enzyme achieves half of its maximum velocity. A high Km value indicates that the enzyme requires a high substrate concentration to achieve half of its maximum activity, suggesting that the enzyme has a lower affinity for the substrate. In other words, it takes a higher concentration of substrate to saturate the enzyme and reach its maximum velocity.

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  • 8. 

    Which is the fastest enzyme?

    • A.

      Trypsin

    • B.

      Pepsin

    • C.

      Carbonic anhydrase

    • D.

      Glucokinase

    Correct Answer
    C. Carbonic anhydrase
    Explanation
    Carbonic anhydrase is the fastest enzyme because it catalyzes the hydration of carbon dioxide to bicarbonate and hydrogen ions at an extremely high rate. This enzyme is found in various tissues and plays a crucial role in maintaining acid-base balance in the body. Its speed is attributed to its active site, which contains a zinc ion that acts as a catalyst, allowing the reaction to occur rapidly. The efficiency and speed of carbonic anhydrase make it the fastest enzyme among the options given.

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  • 9. 

    Committed step of a reaction is 

    • A.

      Irreversible

    • B.

      Rate limiting

    • C.

      Unique to the pathway

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    The committed step of a reaction refers to the point in a chemical reaction where a reactant is irreversibly converted into a product. It is also known as the rate-limiting step because it determines the overall rate of the reaction. Additionally, the committed step is unique to the pathway of the reaction, meaning that it is specific to that particular sequence of reactions. Therefore, all of the given options - irreversible, rate-limiting, and unique to the pathway - accurately describe the committed step of a reaction.

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  • 10. 

    Enzyme(s) catalysing a ping pong reaction

    • A.

      SGPT

    • B.

      Chymotrypsin

    • C.

      Trypsin

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    All of the above enzymes - SGPT, Chymotrypsin, and Trypsin - catalyze a ping pong reaction. In a ping pong reaction, the enzyme undergoes a series of sequential reactions with the substrate. The first substrate molecule binds to the enzyme, and a product is released, leaving behind a modified enzyme. This modified enzyme then binds to a second substrate molecule and releases a second product, ultimately regenerating the original enzyme. All three enzymes listed in the answer options exhibit this ping pong mechanism, making them all correct choices.

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  • 11. 

    True about abzymes

    • A.

      Antibodies against enzymes

    • B.

      Antibodies against transition state of substrate

    • C.

      Antibodies tagged with enzyme

    • D.

      None of the above

    Correct Answer
    B. Antibodies against transition state of substrate
    Explanation
    Abzymes are antibodies that are capable of catalyzing chemical reactions. They are unique because they can bind to and stabilize the transition state of a substrate, which is the intermediate state during a chemical reaction. This allows the abzyme to increase the rate of the reaction. Antibodies against enzymes refer to antibodies that target and bind to specific enzymes, while antibodies tagged with enzyme refer to antibodies that are conjugated with enzymes for various applications. Therefore, the correct answer is antibodies against the transition state of substrate, as abzymes specifically target and bind to the transition state to catalyze reactions.

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  • 12. 

    Activation energy is the free energy difference between

    • A.

      Substrate and product

    • B.

      Substrate and intermediate

    • C.

      Substrate and transition state

    • D.

      All of the above

    Correct Answer
    C. Substrate and transition state
    Explanation
    The activation energy is the energy barrier that must be overcome for a chemical reaction to occur. It represents the difference in energy between the reactants (substrate) and the highest energy point in the reaction pathway (transition state). The transition state is a high-energy, unstable state that exists momentarily during the reaction. Therefore, the correct answer is "substrate and transition state" as it accurately describes the activation energy.

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  • 13. 

    Transition State 

    • A.

      Has more free energy

    • B.

      Is a fleeting momentary chemical species

    • C.

      Analogues are potent competitive inhibitors than substrate analogues

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    The given correct answer is "All of the above". This means that all the statements mentioned in the question are true for the concept of Transition State. Transition State has more free energy, it is a fleeting momentary chemical species, and its analogues are potent competitive inhibitors than substrate analogues.

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Kar |Assistant Professor (Biochemistry) |
Karthikeyan Pethusamy is an assistant professor in the Department of Biochemistry at the All India Institute of Medical Sciences in New Delhi
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