The correct answer is C. Short tandem repeats are mostly different in unrelated peoples' DNA. Therefore, it is used to match the DNA of the people of the related family for identification of bodies, during a mass disaster like World Trade Centre. DNA from the nucleus is extracted in the process, and the STR containing regions are amplified and studied and can be matched with that of the relatives.
The smallest unit of a compound is called a molecule. Molecules are made
up of atoms that are held together by bonds which is a result by
sharing or exchange of electrons.
