Suppose a scientist grows cells in a medium that contains amino acids labeled with a heavy isotope. She isolates histone octamers from some cells and determines the amino acid composition of the histones. Which of the following statements is most likely to be true? 1) The amino acid composition of the histones will be the same as the amino acid composition of the medium. 2) The amino acid composition of the histones will be different from the amino acid composition of the medium. 3) The amino acid composition of the histones will be the same as the amino acid composition of the cells. 4) The amino acid composition of the histones will be different from the amino acid composition of the cells.