Answer:
Chromosome.
Step-by-step explanation:
The long, thread-like, coiled form of DNA is known as chromosome that contains millions of nitrogenous bases. In eukaryotic organisms, the chromosomes are made up of deoxyribonucleic acid and proteins and are found in the nucleus of the cells.
Generally, chromosomes are visible of metaphase of cell division as during this phase, these are present in most condensed form.
Thus, the correct answer is 'chromosomes.'