Question

Present in the nucleolus is
(a) Golgi Complex
(b) Chromosome
(c) Mitochondria
(d) Lysosome

Answer 1

Nucleoli are small, dense, and spherical structures that are present in the nucleus of a cell that is visible during the interphase of cell division. They are membrane- bound organelles and they contain the condensed form of the genetic material of the cells. They contain the structures that are 46 in number in humans.

Complete answer:
The nucleolus is the site where condensed chromosomes are seen. The nucleolar region is dense and is characterized by the presence of proteins, DNA, and RNA. These are formed from specific chromosomal regions called as the nucleolar organizing regions.
Chromosomes are the thread- like structures containing DNA and proteins that are found in the nucleus of most living cells. They carry the genetic information from the parent organism to the offspring in the form of genes.
A chromosome is a DNA molecule with some part or all of the genetic material of an organism. In most eukaryotic organisms, chromosomes include certain packaging proteins that are aided by the chaperone proteins and bind to and condense the DNA molecule to prevent it from becoming an unmanageable tangle of chromatin. This three- dimensional genome structure plays a very significant role in the regulation of transcription.
So, the correct answer is, ‘(b)Chromosome’.

Note:
- The nucleolus is the largest structure present inside the nucleus of eukaryotic cells. But it is not just the site for harboring the chromosome during cell division. - Apart from the site for condensation of chromatin, nucleolus has other important functions.
- It also performs the function of ribosome biogenesis.
- Nucleoli also participate in the signal recognition particle formation that plays a role in the cell's stress response.