Which of the Following Statements About Functional Groups Is INCORRECT

Which of the following statements about functional groups is INCORRECT?

A) Organic molecules consist predominantly of carbon bonded to other atoms of hydrogen, oxygen, nitrogen, phosphorus or sulfur. Other combinations, called functional groups, may be attached.
B) Functional groups maintain their properties no matter where they occur.
C) Functional groups are essential for the properties of the biomolecule.
D) The hydroxyl functional group (OH) is polar and readily forms hydrogen bonds.
E) The thiol group (SH) , found on some amino acids, readily forms hydrogen bonds.