You briefly expose bacteria undergoing DNA replication to radioactively labeled nucleotides.When you centrifuge the DNA isolated from the bacteria,the DNA separates into two classes.One class of labeled DNA includes very large molecules (thousands or even millions of nucleotides long),and the other includes short stretches of DNA (several hundred to a few thousand nucleotides in length).These two classes of DNA probably represent
A)leading strands and Okazaki fragments.
B)lagging strands and Okazaki fragments.
C)Okazaki fragments and RNA primers.
D)leading strands and RNA primers.

Question

Quizplus · Accepted Answer

The two classes of DNA represent leading strands and Okazaki fragments. The very large molecules are the continuously synthesized leading strands, while the short stretches of DNA are the Okazaki fragments, which are synthesized discontinuously on the lagging strand.

You Briefly Expose Bacteria Undergoing DNA Replication to Radioactively Labeled