Correct Answer:
Option B - DNA molecules are tightly packed around proteins called histone to make structure called chromosomes. The DNA that contains genes is stored in cells in a structure called the nucleus. DNA is a molecule composed of two polynucleotide chains. DNA was first isolated by Friedrich Miescher in 1869, DNA's double helix structure was elucidated by James Watson and Crick in 1953.
B. DNA molecules are tightly packed around proteins called histone to make structure called chromosomes. The DNA that contains genes is stored in cells in a structure called the nucleus. DNA is a molecule composed of two polynucleotide chains. DNA was first isolated by Friedrich Miescher in 1869, DNA's double helix structure was elucidated by James Watson and Crick in 1953.