Chapter U2, Problem 14STP

Interpretation Introduction

Interpretation:

The aspects which conclude about smell molecules from the receptor site theory needs to be determined.

Concept introduction:

Smell molecules are the chemicals which stimulates sensory nerve cell at nasal cavity and respond by sending the signals to the brain.

Answer to Problem 14STP

option (IV)

Explanation of Solution

Reason for correct option:

Smell is a process of chemical change. Smell can be determined by binding of a molecule to the various receptors. Overall smell of a molecule basically depends on responses from the different receptors bind with the nerves. The brain gives the exact signal and identifies the particular smell.

Conclusion

Reasons for incorrect options:

1. Molecular shape can be determined after the binding of molecules with the receptors.
2. Smell molecules are originally in gaseous state.
3. Smell molecule dock in neurons of stimuli organ that matches their molecular shapes

Thus, options (I), (II) and (III) are incorrect.