You Briefly Expose Bacteria Undergoing DNA Replication to Radioactively Labeled

question 50

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) . 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.
• E) RNA primers and mitochondrial DNA.

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Definitions:

Tristearin

A triglyceride derived from stearic acid, commonly found in animal and vegetable fats, used in the production of soaps and cosmetics.

B-carotene

A highly pigmented orange compound that is a precursor to vitamin A, found in various fruits and vegetables and used as a dietary supplement.

Phosphatidic Acid

A phospholipid that acts as a key intermediate in the biosynthesis of many other lipids.

Prostaglandin

A group of physiologically active lipid compounds having diverse hormone-like effects in animals.