Study carefully the following statements and select the incorrect ones.
When fats are used in respiration, the RQ is more than unity because fats contain more `O_(2)` and require relatively less amount of `O_(2)` for oxidation.
(ii) The most important energy carrier is ATP. This energy rich compound is mobile and can pass from one cell to another.
(iii) Before pyruvic acid enter Krebs' cycle, one of the two carbon atoms of pyruvic acid is reduced to carbon dioxide in the reaction called reductive carboxylation.
(iv) A special electron carrier system located in the mitochondrial membrane is called shuttle system. It transfers electron from the hydrogens of cytoplasmic NADH to the mitochondrial electron carriers across the mitochondrial membrane.
(v) Zymase is a complex mixture of many enzymes which requires several coenzymes for its action. The enzyme complex-zymase catalyses series of reaction taking place during fermentation leading to the production of ethyl alcohol.

Options

A. (i) and (ii)
B. (iii) and (iv)
C. (i),(ii) and (iii)
D. (iii),(iv) and (v)

Explanation

To solve the question, we need to analyze each statement provided and identify which ones are incorrect. Let's go through them step by step.

### Step 1: Analyze Statement (i)
**Statement:** When fats are used in respiration, the RQ is more than unity because fats contain more `O2` and require relatively less amount of `O2` for oxidation.

**Analysis:**
- RQ (Respiratory Quotient) is the ratio of the volume of carbon dioxide produced to the volume of oxygen consumed during respiration.
- Fats have a lower oxygen to carbon ratio compared to carbohydrates. Therefore, when fats are oxidized, they require more oxygen, leading to an RQ value of less than 1, not more than 1.
- **Conclusion:** This statement is incorrect.

### Step 2: Analyze Statement (ii)
**Statement:** The most important energy carrier is ATP. This energy-rich compound is mobile and can pass from one cell to another.

**Analysis:**
- ATP (Adenosine Triphosphate) is indeed the most important energy carrier in cells.
- However, ATP cannot pass from one cell to another. It is used within the cell where it is produced.
- **Conclusion:** This statement is incorrect.

### Step 3: Analyze Statement (iii)
**Statement:** Before pyruvic acid enters Krebs' cycle, one of the two carbon atoms of pyruvic acid is reduced to carbon dioxide in the reaction called reductive carboxylation.

**Analysis:**
- The process that occurs before pyruvic acid enters the Krebs cycle is oxidative decarboxylation, where one carbon atom is removed as carbon dioxide.
- The term "reductive carboxylation" is incorrect in this context.
- **Conclusion:** This statement is incorrect.

### Step 4: Analyze Statement (iv)
**Statement:** A special electron carrier system located in the mitochondrial membrane is called the shuttle system. It transfers electrons from the hydrogens of cytoplasmic NADH to the mitochondrial electron carriers across the mitochondrial membrane.

**Analysis:**
- The shuttle systems do exist in mitochondria and are responsible for transferring electrons from NADH produced in the cytoplasm into the mitochondria.
- This statement is correct.
- **Conclusion:** This statement is correct.

### Step 5: Analyze Statement (v)
**Statement:** Zymase is a complex mixture of many enzymes which requires several coenzymes for its action. The enzyme complex zymase catalyzes a series of reactions taking place during fermentation leading to the production of ethyl alcohol.

**Analysis:**
- Zymase is indeed a complex of enzymes found in yeast that facilitates fermentation, leading to the production of ethyl alcohol.
- This statement is correct.
- **Conclusion:** This statement is correct.

### Final Conclusion
The incorrect statements are:
1. Statement (i)
2. Statement (ii)
3. Statement (iii)