Question

In addition to superhelicity, DNA must be still further packaged to fit into the bacteria or cell. Which of the following is correct? A. Both prokaryotic and cukaryotic DNA form chromatin. B. A bacterial chromosome contains a single DNA molecule, but a human chromosome contains more than one DNA. C. Packaging of DNA into nucleosomes does not involve topoisomerases. D. Polysomes are the highest level of packaging DNA undergoes. E. Thirty-nm fibers (solenoids) can organize into a series of looped, condensed domains.

Short answer

Answer: Thirty-nm fibers (solenoids) can organize into a series of looped, condensed domains.

Step-by-step solution

Analyze the Options

To solve this multiple-choice exercise, let's analyze each option: A. Both prokaryotic and eukaryotic DNA form chromatin. B. A bacterial chromosome contains a single DNA molecule, but a human chromosome contains more than one DNA. C. Packaging of DNA into nucleosomes does not involve topoisomerases. D. Polysomes are the highest level of packaging DNA undergoes. E. Thirty-nm fibers (solenoids) can organize into a series of looped, condensed domains.

Eliminate Incorrect Options

Now, let's eliminate incorrect options: Option D is incorrect because polysomes are structures containing multiple ribosomes that translate the same messenger RNA simultaneously. They are not related to DNA packaging.

Identify the Correct Answer

After analyzing and eliminating the wrong options, we can conclude that the correct option is: E. Thirty-nm fibers (solenoids) can organize into a series of looped, condensed domains. This option is correct because thirty-nm fibers, also known as solenoids, are the next level of DNA packaging after nucleosomes. These fibers can further condense and loop to fit into the cell or bacteria efficiently.