State three functions of Nucleolus. And explain the structure of nucleus
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Answer:
function of nucleulos:
Nucleolus helps in protein synthesis and production of the ribosome in the cells.
The Multiple Functions of the Nucleolus in Plant Development, Disease and Stress Responses. The nucleolus is the most conspicuous domain in the eukaryotic cell nucleus, whose main function is ribosomal RNA (rRNA) synthesis and ribosome biogenesis.
Structure of the Nucleolus
In eukaryotic cells, nucleolus has a well-ordered structure with four main ultrastructural components. The components can be further identified as:
Fibrillar Centers: It is the place where the ribosomal proteins are formed.
Granular Components: Before ribosomes are formed, these components have rRNA that binds to ribosomal proteins.
Dense Fibrillar Components: It has new transcribed RNA which connects to the ribosomal proteins.
Nucleolar vacuoles: It is present only in Plant cell.
The ultrastructure of the nucleolus can be easily visualized through an electron microscope. The arrangement of the nucleolus within the cell can be clearly studied by the techniques – fluorescent recovery after photobleaching and fluorescent protein tagging.
The nucleolus of several plant species has very high concentrations of iron in contrast to the human and animal cell nucleolus.
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Answer:
The nucleolus is considered as the brain of the nucleus. It occupies around 25% of the volume of the nucleus. It is mainly involved in the production of subunits which then together form ribosomes. Therefore, nucleolus plays an important role in protein synthesis and the production of ribosomes in eukaryotic cells.
Explanation:
The nucleus is a membrane-bound organelle that contains genetic material (DNA) of eukaryotic organisms. As such, it serves to maintain the integrity of the cell by facilitating transcription and replication processes. It's the largest organelle inside the cell taking up about a tenth of the entire cell volume.