Why does DNA need to be tightly packed within the cell nucleus?

• A. To prevent DNA from being damaged by cellular processes
• B. To ensure that DNA strands do not become tangled
• C. To fit the large amount of genetic material into the limited space of the nucleus
• D. To allow for easier access by enzymes during replication

Answer: (C)

Verified step by step guidance

1. Understand the structure of DNA: DNA is a long, double-helix molecule composed of nucleotides. It carries genetic information essential for the functioning and reproduction of living organisms.
2. Consider the size of DNA: The human genome consists of approximately 3 billion base pairs, which, if stretched out, would measure about 2 meters in length. This is far too long to fit into the small space of a cell nucleus without being compacted.
3. Learn about chromatin: DNA is wrapped around proteins called histones, forming a complex known as chromatin. This structure allows DNA to be efficiently packed within the nucleus.
4. Explore the role of chromatin in DNA packing: Chromatin can further coil and fold into higher-order structures, such as chromosomes, especially during cell division. This compaction is crucial for fitting the large amount of genetic material into the limited space of the nucleus.
5. Recognize the importance of DNA packing: Tightly packed DNA ensures that the genetic material is organized and protected, while still being accessible for processes like replication and transcription when needed.