Question

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

Answer 1

Hint: The nucleus is a membrane-bound organelle which contains eukaryotic organisms' genetic material ( DNA). As such, by promoting transcription and replication processes, it helps to preserve the cell's integrity.

Complete Answer:
Some of a nucleus's other main components include:
- A membrane with a phospholipid bilayer
- Nucleoplasm
- Nucleolus
- Chromatic

- There is a lack of a nucleus in some eukaryotic cells and they are called enucleate cells (e.g. erythrocytes), while others can have more than one nucleus (e.g. slime moulds). In the nucleus, chromosomes are thread-like structures made up of DNA strands and histone proteins.

The major sections of the chromosome are:
- The Kinetochores
- The Telomere
- Chromatids (each of which consists of the arms p and q).
- Chromosomes in the nucleus are tightly packed, making it possible for very large quantities of genetic material ( DNA) to be stored in such a small region (about 3 billion pairs in each cell).

Chemical composition of the nucleus:
- 9-12 percent of DNA
- 15 percent of the histone
- 65 percent of enzymes, neutral proteins and acidic proteins
- 5 percent of RNA
- 3% of lipids

Some of the core functions of nucleus include:
- Synthesis of proteins, cell division, and differentiation.
- Monitor the synthesis of enzymes involved in cell metabolism.
- Regulation of the genetic characteristics of the organism.
- Store DNA strands, proteins, and ARN.
- RNA transcription site-e.g. mRNA necessary for protein synthesis.

The correct answer is option (C) Chromosomes.

Note: Since the nucleus contains the genetic code of the organism that specifies the amino acid sequence of proteins that are essential to day-to-day operation, it mainly acts as the cell information centre.