
Interpretation:
Whether feet can be used to explain the handedness of a molecule or not needs to be explained. Whether it fits into the receptor site or not needs to be determined.
Concept introduction:
Handedness means chirality of an object. When the mirror image of the object is non-super imposable then it is showing handedness.

Answer to Problem SIV3E
Left feet and right feet are mirror-image of each other which are non-superimposable. Thus, feet are showing handedness.
Explanation of Solution
To fit with a receptor site, the molecule should have structural complementarity with the receptor. For example left feet will not fit in the right feet. Similarly, all molecules can’t fit with receptor site except the molecule which has proper shape and orientation.
Thus, feet can be used to explain how a molecule can fit with receptor site.
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