Question

Identify enzyme "X" in the reaction \( {CO}_2 + {H}_2{O} \xrightarrow{{X}} {H}_2{CO}_3 \):

• A. Carbonic kinase
• B. Carbonic anhydrase
• C. Carbonic peroxidase
• D. Carbonic catase

Hint:

Remember that carbonic anhydrase is crucial not just in the lungs but also in the kidneys and other tissues where it aids in pH regulation and ion transport.

Answer 1

The Correct Option is B

Step 1: Analysis of the reaction. The reaction provided is the conversion of carbon dioxide and water into bicarbonate. The enzyme that catalyzes this reaction is known for rapidly converting \( {CO}_2 \) and \( {H}_2{O} \) into \( {H}_2{CO}_3 \) (carbonic acid). 
Step 2: Identifying the enzyme. Carbonic anhydrase is the enzyme that facilitates this reaction. It is one of the fastest enzymes in terms of turnover number, playing a critical role in respiratory gas exchange and maintaining acid-base balance in the blood.

Answer 2

To solve this problem, we need to identify the enzyme "X" that catalyzes the conversion of CO₂ and H₂O into H₂CO₃.

1. Understanding the Reaction:
The given reaction involves the combination of carbon dioxide (CO₂) and water (H₂O) to form carbonic acid (H₂CO₃). This reaction is catalyzed by an enzyme, which facilitates the process by lowering the activation energy for the reaction.

2. Identifying the Enzyme:
The enzyme responsible for this reaction is known as carbonic anhydrase. Carbonic anhydrase is responsible for catalyzing the reversible reaction that converts CO₂ and H₂O into carbonic acid (H₂CO₃) in various organisms, including humans and plants.

3. Conclusion:
Given that carbonic anhydrase catalyzes this specific reaction, we can conclude that enzyme "X" is carbonic anhydrase.

Final Answer:
The correct answer is Option B: Carbonic anhydrase.