You Briefly Expose Bacteria Undergoing DNA Replication to Radioactively Labelled

question 13

Multiple Choice

You briefly expose bacteria undergoing DNA replication to radioactively labelled nucleotides. When you centrifuge the DNA isolated from the bacteria, the DNA separates into two classes. One class of labelled 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:

Microfilaments

Thin strands within the cytoskeleton of a cell, primarily composed of the protein actin, and involved in various forms of cell movement and structure.

Nucleus

A membrane-bound organelle found in eukaryotic cells that contains most of the cell's genetic material, directing cell growth, metabolism, and reproduction.

Chromosomes

Structures composed of DNA and protein found in the nucleus of cells, carrying genetic information across generations.

Genes

Units of heredity that carry information from parents to offspring, dictating the development of traits and characteristics.