You Briefly Expose Bacteria Undergoing DNA Replication to Radioactively Labeled

question 59

Multiple Choice

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) . Which two classes of DNA do these different samples 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

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