Question:
In Yeast, the pyruvate is decarboxylated to form----
In Yeast, the pyruvate is decarboxylated to form----
Show Hint
The first step of alcoholic fermentation removes carbon dioxide from pyruvic acid before NADH is used.
Updated On: Nov 12, 2026
- Ethyl alcohol
- Acetaldehyde
- Acetyl Co-A
- Lactic acid
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
In alcoholic fermentation, yeast converts pyruvic acid to ethyl alcohol in two steps.
Step 2: Step 1: Decarboxylation
The enzyme pyruvate decarboxylase removes \(\text{CO}_2\) from the 3-carbon pyruvic acid. This gives the 2-carbon compound acetaldehyde.
Step 3: Step 2: Reduction
Alcohol dehydrogenase then reduces acetaldehyde to ethyl alcohol using NADH. This is not the decarboxylation step.
Step 4: Conclusion
The product formed directly when pyruvate is decarboxylated is acetaldehyde.
Final Answer:
Decarboxylation of pyruvate in yeast gives acetaldehyde. \[ \boxed{\text{(B) }\text{Acetaldehyde}} \]
In alcoholic fermentation, yeast converts pyruvic acid to ethyl alcohol in two steps.
Step 2: Step 1: Decarboxylation
The enzyme pyruvate decarboxylase removes \(\text{CO}_2\) from the 3-carbon pyruvic acid. This gives the 2-carbon compound acetaldehyde.
Step 3: Step 2: Reduction
Alcohol dehydrogenase then reduces acetaldehyde to ethyl alcohol using NADH. This is not the decarboxylation step.
Step 4: Conclusion
The product formed directly when pyruvate is decarboxylated is acetaldehyde.
Final Answer:
Decarboxylation of pyruvate in yeast gives acetaldehyde. \[ \boxed{\text{(B) }\text{Acetaldehyde}} \]
Was this answer helpful?
0
0
Top MHT CET Biology Questions
- During r- DNA technology, which one of the following enzymes is used for cleaving DNA molecule ?
- Important sperm lysin used for dissolving egg covering is
- In biogas plant, the role of acidogenic bacteria is to
- In $C_{3}$ plants, the first stable product of photosynthesis during the dark reaction is
- In case of anaerobic respiration, the RQ is ___________
View More Questions
Top MHT CET Fermentation Questions
- Which microorganism is use in yoghurt production
- Which one of the following respiratory reactions does NOT yield \(\text{CO}_{2}\)?
- Given below are two statements regarding anaerobic respiration in the muscles.
Statement (I): In muscles, NADH+H\({}^{+}\) produced during glycolysis is reoxidised to NAD.
Statement (II): One proton and two electrons produced, which are donated to pyruvic acid which yields lactic acid leading to muscle fatigue.
In light of the above statements, choose the most appropriate answer from the options given below. - If glucose is incompletely oxidized to ethyl alcohol in the absence of oxygen, the RQ will be ______.
- During lactic acid fermentation, pyruvic acid is reduced to lactic acid using one proton and two electrons from ________________.
View More Questions
Top MHT CET Questions
- During r- DNA technology, which one of the following enzymes is used for cleaving DNA molecule ?
- In non uniform circular motion, the ratio of tangential to radial acceleration is (r = radius of circle, $v =$ speed of the particle, $\alpha =$ angular acceleration)
- The temperature of $32^{\circ}C$ is equivalent to
- The line $5x + y - 1 = 0$ coincides with one of the lines given by $5x^2 + xy - kx - 2y + 2 = 0 $ then the value of k is
- The heat of formation of water is $ 260\, kJ $ . How much $ H_2O $ is decomposed by $ 130\, kJ $ of heat ?
View More Questions