Question

The thread-like structures present in the nucleus are
A. Nucleolus
B. Chromosomes
C. Genes
D. Ribosomes

Answer 1

Hint: The nucleus is a very important organelle present in every cell.
It is known as the master of the cell. It contains hereditary information.

Complete answer:
The nucleus has a nuclear membrane, nuclear pore, nucleoplasm, nucleolus, and chromatin. The chromatin is made up of DNA and protein (histone protein).

This is the string-like structure inside the nucleus. During cell division, the chromosomes are separated from the chromatin. The nucleolus is present inside the nucleus.
It is visible only when the cell is not dividing. It contains RNA and helps to synthesize ribosomes.
The DNA makes up genes. Genes are called the basic functional units of heredity.
Many genes are responsible for making special molecules called proteins.
The ribosomes are known to synthesize proteins.
It is made up of ribosomal RNA (from the nucleolus in the nucleus).
In eukaryotes, the nucleus is a membrane-bound cell organelle whereas in prokaryotes the nucleus does not have a nucleus. The main function of chromatin is to package DNA into a very small space.

So, the correct answer is “Option B”.

Note: The long DNA strand winds around the histone protein to form beads on a string structure. This then spirals again and again to form a highly entangled structure that looks like strings. This way chromatin is formed.