The tallest artificial structure is Burj Khalifa, a skyscraper in Dubai that reached 829.8 m (2,722 ft) in height on January 17, 2009. By April 7, 2008 it had been built higher than the KVLY-TV mast in North Dakota, USA.
The nucleolus is a round body located inside the nucleus of a eukaryotic cell. It is not surrounded by a membrane but sits in the nucleus. The nucleolus makes ribosomal subunits from proteins and ribosomal RNA, also known as rRNA. It then sends the subunits out to the rest of the cell where they combine into complete ribosomes.
the chains of rna and dna are the structural components of nucleolus it is composed of granular and fibrillar components the fibrillar components are categorized into fibrillar centers and dense fibrillar component this type of structural organization of nucleolus is found in eukaryotic cellshe main function of nucleolus is to produce and assemble subunits which form the ribosome ribosome is the site for protein synthesis nucleolus plays an indirect but crucial role in protein synthesis by assembling the ribosome subunits