Functional groups

1. are the repeating unit of polymers.
2. are groups of atoms whose chemical prop-
erties are pretty much independent of their
chemical environment.
3. perform specific biological functions using
molecular recognition.
4. are a fictitious concept like oxidation
numbers (useful but not real).

I believe it's 3 but I'm not sure. Can anybody give an answer and explanation? Thanks!

4 answers

Nuts to 3. Functional groups do not perform specific biological functions, nor are they in polymers.
Should it be 4 then?
And it CERTAINLY is not 4.
Its 2. I had this question on a quiz
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