A molecule cannot be tasted or smelled until it has been

Options

A. Converted into protein
B. Converted into transmitter
C. Grouped into multimolecular complex
D. Dissolved in a liquid

Answer

To solve the question "A molecule cannot be tasted or smelled until it has been...", we need to analyze the options provided and understand the mechanisms of taste and smell.

### Step-by-Step Solution:

1. **Understanding Taste and Smell**:
- Taste and smell are senses that require molecules to interact with specific receptors in our body. For taste, we have taste buds on our tongue, and for smell, we have olfactory receptors in our nasal cavity.

2. **Analyzing the Options**:
- **Option 1: Converted into Protein**:
- This option is incorrect because proteins are large molecules made of amino acids and are not necessary for the basic function of taste and smell. Molecules do not need to be converted into proteins to be tasted or smelled.

- **Option 2: Converted into Transmitter**:
- This option refers to neurotransmitters, which are involved in signaling between neurons. While neurotransmitters are important for communication in the nervous system, they are not directly involved in the processes of tasting or smelling. Therefore, this option is also incorrect.

- **Option 3: Converted into Multi-molecular Complex**:
- This option suggests that a molecule must form a complex with other molecules. However, this is not a requirement for taste or smell. Hence, this option is also incorrect.

- **Option 4: Dissolved in Liquid**:
- This is the correct option. For a molecule to be tasted or smelled, it must be dissolved in a liquid (like saliva for taste or air for smell) so that it can interact with the respective receptors.

3. **Conclusion**:
- The correct answer is that a molecule cannot be tasted or smelled until it has been **dissolved in liquid**.

### Final Answer:
A molecule cannot be tasted or smelled until it has been **dissolved in liquid**.

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