The fungi which are used to produce the product which is also the first stable product of TCA cycle belongs to

Options

A. Phycomycetes
B. Ascomycetes
C. Basidiomycetes
D. Deuteromycetes

Answer

To solve the question, we need to identify the class of fungi that is used to produce citric acid, the first stable product of the TCA cycle (Krebs cycle). Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the TCA Cycle
The TCA cycle, also known as the Krebs cycle or citric acid cycle, is a key metabolic pathway that takes place in the mitochondrial matrix. It involves the oxidation of acetyl-CoA to produce energy.

**Hint:** Remember that the TCA cycle is crucial for aerobic respiration and involves several key products.

### Step 2: Identify the First Stable Product
The first stable product of the TCA cycle is citric acid (also known as citrate). This compound is a tricarboxylic acid, meaning it has three carboxylic acid groups.

**Hint:** Focus on the definition of stable products in metabolic cycles.

### Step 3: Fungi Involved in Citric Acid Production
The question asks about fungi that are used to produce citric acid. The primary fungus known for commercial production of citric acid is *Aspergillus niger*.

**Hint:** Think about common fungi used in industrial fermentation processes.

### Step 4: Class of the Fungi
*Aspergillus niger* belongs to the class Ascomycetes, which are also referred to as "sac fungi." This class is characterized by the formation of ascospores.

**Hint:** Recall the classification of fungi and the specific characteristics of Ascomycetes.

### Step 5: Evaluate the Options
The options provided in the question include:
- Phycomyces
- Ascomycetes (correct answer)
- Basidiomycetes
- Deuteromycetes

Since *Aspergillus niger* belongs to Ascomycetes, the correct answer is the second option.

**Hint:** Compare the characteristics of the different classes of fungi to confirm your answer.

### Final Answer
The fungi which are used to produce the product which is also the first stable product of the TCA cycle belongs to the class **Ascomycetes**.