The solenoid structure is a term used to describe which of the following levels of chromosome condensation? a. 300nm-fiber
b. 10nm-fiber
c. 30nm-fiber
d. 1400nm-condensed chromosome

The correct answer is: c. 30nm-fiber.

Explanation:

Eukaryotic DNA molecules condense themselves in various steps to achieve a smaller size that will make it easier for the genetic information to be distributed when cell division happens.

This condensation generates different structures depending on the level of packing. The DNA double-strand without any condensation consists of a 2nm fiber. When this 2nm fiber is compacted with proteins called histones, a structure called nucleosome, with an 11nm fiber appears. These nucleosomes begin to pack themselves again, and this is how the solenoid is formed.

The solenoid structure consists of a 30nm fiber. While the nucleosome makes the DNA 7 times smaller, the solenoid can make it 40 times smaller.

Explanation:

There are two differences that distinguish DNA from RNA: (a) RNA contains the sugar ribose, while DNA contains the slightly different sugar deoxyribose (a type of ribose that lacks one oxygen atom), and (b) RNA has the nucleobase uracil while DNA contains thymine