Find the incorrect statements ,
(A) , In hemodialysis , the dialysing unit contains a coiled cellophane tube surrounded by dialyzing fluid , have the same composition as that of plasma except the nitrogenous waste .
(B) The production of uric acid is enhaneed by excessive metabolism of nucleic acids .
(C) All marine amphibians are ammonotelic , of urea .

Options

A. A & B only
B. C & D only
C. B & C only
D. A & D only

Answer

To solve the question of identifying the incorrect statements, let's analyze each statement step by step:

### Step 1: Analyze Statement A
**Statement A:** "In hemodialysis, the dialysing unit contains a coiled cellophane tube surrounded by dialyzing fluid, which has the same composition as that of plasma except for nitrogenous waste."

- **Explanation:** In hemodialysis, the blood is passed through a coiled cellophane tube, and the dialyzing fluid surrounding this tube is designed to mimic plasma's composition. The key point is that the dialyzing fluid does not contain nitrogenous wastes, allowing these wastes to diffuse out of the blood into the dialyzing fluid. Therefore, this statement is **correct**.

### Step 2: Analyze Statement B
**Statement B:** "The production of uric acid is enhanced by excessive metabolism of nucleic acids."

- **Explanation:** Uric acid is a product of purine metabolism, which is related to nucleic acids. However, the statement suggests a direct enhancement of uric acid production due to excessive nucleic acid metabolism, which is not accurate. While nucleic acid breakdown can lead to uric acid production, the statement implies a direct correlation that is misleading. Thus, this statement is **incorrect**.

### Step 3: Analyze Statement C
**Statement C:** "All marine amphibians are ammonotelic."

- **Explanation:** Ammonotelic organisms excrete ammonia as their primary nitrogenous waste. While many marine amphibians may be ammonotelic, it is not true that all marine amphibians fit this classification. Some may excrete urea or uric acid depending on their environment and physiological adaptations. Therefore, this statement is also **incorrect**.

### Conclusion
- **Incorrect Statements:**
- Statement B: "The production of uric acid is enhanced by excessive metabolism of nucleic acids." (Incorrect)
- Statement C: "All marine amphibians are ammonotelic." (Incorrect)

### Final Answer
The incorrect statements are **B and C**.

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