Answer:
The correct option will be DNA is contained in chromosomes, and chromosomes are contained in the cell nucleus.
Explanation:
DNA is the genetic material of the eukaryotic organisms which is organised into highly specialized structures to fit in the nucleus of every cell.
DNA forms association with proteins to form compact structure as:
1. 11 nm nucleosomes- formed by wrapping of DNA around histone proteins forming nucleosomes which appears as beads on a string structure.
2. 30 nm fiber- formed by folding of nucleosomes which form compact structure.
3. 300 nm looped structure- solenoid structure formed by folding of 30 nm fiber.
4. 700 nm chromosome structure- formed by folding of 300 nm structure forming compact structure called chromosome.
So, the continuous thread-like molecule of DNA forms a compact structure called chromosome by forming association with proteins which fits into the microscopic space of the eukaryotic nucleus.
Thus, DNA is contained in chromosomes, and chromosomes are contained in the cell nucleus is the correct answer.
