Question

HEYA GUYS ......STATE THE FUNCTION AND PARTS OF NUCLEUS...... DON'T SPAM....​

Answer 1

The nucleus is a spherical-shaped organelle that is present in every eukaryotic cell. The Nucleus is the control centre of eukaryotic cells. It is also responsible for the coordination of genes and gene expression. The structure of the nucleus includes nuclear membrane, chromosomes, nucleoplasm, and nucleolus.

Answer 2

Answer:

Explanation:

➔ Nucleus is a double membraned dense cell organelle.

➔ The nucleus maybe disc shaped , spherical, bilobed, multilobed etc.

➔ It is mostly found in metabolically active regions.

Functions of Nucleus:

➔ It stores genetic information in the form of genes.

➔ It provides a site for the sythesis of ribosomes and RNA's

➔ It acts as the main controller of all the cellular activities.

➔ DNA replication, DNA transcription and proteins synthhesis takes place in the nucleus.

➔ It possesses all the information required for the growth and development of an organism.

Parts of a nucleus:

• Nuclear membrane : It is also called as the karyotheca. It is composed of two membranes which are separated by a perinuclear space. The nuclear membrane contains several pores called as the nuclear pores. These pores are closed by circular structures called as the annuli.

• Nucleoplasm: This is the fluid part of the nucleus. It contains DNA and associated proteins alog with ions, enzymes and nucleotides. It is the main site for synthesis of DNA.

• Nucleolus: It is a spherical membraneless body within the nucleus. It is formed from specific sites on chromosomes whhich are called as nucleolar organiser regions. A nucleolus maybe plasmosome (false) or karyosome (true). Nucleolus is absent in yeast, bacteria, embryonic cells, erythrocytes etc. It consist of pars amorpha, pars chromosome, nucleonema, pars granulosa. It is a site of ribosome synthesis.

• Chromatin: It is composed of DNA, proteins and transcribing RNA. They are mainly histonic proteins composed of lygine and arginine. During cell division, chromatin condenses to form chromosomes.  

• Chromosome: It is clearly visible during the metaphase stage of cell division. There are 4 types of chromosomes - Acentric chromosome (without a centromere), monocentric (single centromere), dicentric(two centromeres) and polycentric (many centromeres). Chromosomes consist of the following parts, pellicle, matrix, chromonema, chromatid, centromere, sencondary constriction and trabant