Answer:
The double strand is twisted and coiled.
Step-by-step explanation:
The information contained in the DNA molecule is able to fit in the nucleus through a combination of mechanisms:
Genes are packed into chromosomes: DNA in the nucleus is organized into structures called chromosomes. Each chromosome is a long, linear molecule of DNA that is tightly coiled and condensed. This condensation allows for a significant reduction in the physical space needed to store the genetic information.
The double strand is twisted and coiled: The DNA double helix itself is a twisted and coiled structure. This coiling helps in compacting the DNA into a small space. Histone proteins play a crucial role in winding DNA into tight nucleosomes, further aiding in compaction.
It is broken into microscopic segments: DNA is divided into segments known as genes. Each gene contains the instructions for a specific protein or set of proteins. These genes are organized within the chromosomes, and only a portion of the DNA needs to be accessed at any given time, allowing for efficient storage and access to genetic information.
While the organization of DNA into chromosomes and the coiling of the double helix are well-understood mechanisms, it's important to note that the detailed three-dimensional structure of DNA and the regulation of how specific segments are accessed and utilized are still active areas of scientific research. So, while the mechanisms are understood, there is ongoing research to further explore the intricacies of DNA organization within the nucleus.