Use the Following Information to Answer the Question(s) Below

Use the following information to answer the question(s) below.
Nucleotides can be radiolabeled before they are incorporated into newly forming DNA and, therefore, can be assayed to track their incorporation. In a set of experiments, a student-faculty research team used labeled T nucleotides and introduced these into the culture of dividing human cells at specific times.
-In eukaryotic cells, chromosomes are composed of ________.

A) DNA and RNA
B) DNA only
C) DNA and proteins
D) DNA and phospholipids