Living organisim have

Options

A. `alpha` -amino acids and L-sugars
B. L-amino acids and D-surgar
C. D-amino acids and L-sugar
D. `alpha`- amino acids and `alpha`-sugars.

Answer

**Step-by-Step Solution:**

1. **Understanding Amino Acids and Sugars:**
- Amino acids are the building blocks of proteins. They can exist in different forms based on their chirality (the property of having distinct left and right forms).
- Sugars, or carbohydrates, also have chirality and can exist in different forms.

2. **Identifying the Forms:**
- There are two main forms of amino acids and sugars: L (levo) and D (dextro).
- L-amino acids are those that rotate polarized light to the left, while D-sugars rotate polarized light to the right.

3. **Amino Acids in Living Organisms:**
- In living organisms, particularly in humans, the amino acids that are used to form proteins are predominantly in the L-form. This means that proteins in the body are composed of L-amino acids.

4. **Sugars in Living Organisms:**
- In contrast, the sugars that are found in living organisms, including humans, are primarily in the D-form. This means that the carbohydrates in the body are composed of D-sugars.

5. **Conclusion:**
- Therefore, the correct answer to the question is that living organisms have L-amino acids and D-sugars.

**Final Answer:**
Living organisms have L-amino acids and D-sugars.

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