If plant cells are grown on media containing radioactively labeled thymine for one generation, radioactively labeled macromolecules will be detected in which of the following?
A) only in the nucleus
B) only in the nucleus and mitochondria
C) only in the nucleus and chloroplasts
D) in the nucleus, mitochondria, and chloroplasts

Question

Quizplus · Accepted Answer

Radioactively labeled thymine will be incorporated into newly synthesized DNA during cell division. Therefore, the labeled macromolecules will be present in the nucleus. Mitochondria and chloroplasts also have their own DNA and replicate independently, so they will also contain the labeled thymine and show the radiation.

If Plant Cells Are Grown on Media Containing Radioactively Labeled