Waste products of adenine and guanine metabolism are excreted by man as:

Options

A. urea
B. uric acid
C. ammonia
D. proteins

Explanation

To solve the question regarding the waste products of adenine and guanine metabolism excreted by humans, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Compounds**: Recognize that adenine and guanine are both purines. This is crucial because it helps us understand the metabolic pathway they undergo.

2. **Understand the Metabolism**: When adenine and guanine are metabolized in the human body, they undergo a series of biochemical transformations.

3. **Conversion to Xanthine**: The first step in the metabolism of purines (adenine and guanine) involves their conversion into xanthine. This is an important intermediate in the purine degradation pathway.

4. **Role of Enzymes**: The enzyme responsible for converting xanthine into uric acid is called xanthine oxidase. This enzyme is present in the liver and small intestine.

5. **Final Product**: The final product of the metabolism of adenine and guanine, after being converted through xanthine, is uric acid.

6. **Excretion in Humans**: Humans are classified as ureotelic organisms, meaning they primarily excrete waste products in the form of urea. However, the specific waste product from the metabolism of purines (adenine and guanine) is uric acid.

7. **Conclusion**: Therefore, the waste products of adenine and guanine metabolism are excreted by humans as uric acid.

### Final Answer:
The waste products of adenine and guanine metabolism are excreted by man as **uric acid**.

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