CHAPTER 1 MULTIPLE CHOICE - Choose the one alternative that best completes the statement or answers the question. 1) The basic unit of heredity is the ___________. A) individual B) gene C) macromolecule D) trait E) none of the answers are correct 2) A variation of a gene is called a(n) _______. A) species B) morph C) genome D) allele E) proteome 3) Which of the following acts to accelerate chemical reactions in a cell?