What s in the nucleolus? How rRNA is synthesized

Yes, nucleolus.

The site has rRNA, ribosomes.

One of the components is RRNA.

The RNA RNA of ribosomes is transcribed and synthesized at the nucleolus site. The nucleolus contains the gene RDNA, which controls RNA synthesis, and the function of the nucleolus is to transcribe RNA and form ribosomal size subunits.

TDNA, the gene that controls the synthesis of tRNA, is the gene that can be transcribed to form tRNA in the nucleus.

The location of transcription to form tRNA is outside the nucleolus of the nucleus.

The nucleolus, which is usually a single or multiple homogeneous spherical bodies, has a medium-round or oval-shaped granular structure and has no outer membrane.

The nucleolus is composed of three parts: fiber center (FC), dense fiber component (DFC) and particle component (GC).

Nucleolar components include rRNA, RDNA, and ribonucleoproteins. The nucleolus is the site of RNA gene storage, RNA synthesis and processing, and assembly of ribosomal subunits.

Prokaryotic and eukaryotic ribosomes contain different RNAs and are synthesized differently. When prokaryotic RNA genes are transcribed, a large precursor RNA is formed, and then it is cleaved into three types of RNA, which binds to proteins to form ribosomes. Eukaryotes have four kinds of RNA, three of which have genes located in the nucleolar region, which are transcribed into precursor RNAs under the catalysis of RNA polymerase I, and then processed to form RNAs to form ribosomes.

1. Nucleoli are related to the synthesis of RRNA.

2. Ribosomal RNA, that is, RRNA, is a class of RNA with the most content in cells, and it is also a class of RNA with the largest relative molecular mass among the three types of RNA (tRNA, mRNA, RRNA), which combines with proteins to form ribosomes, and its function is to synthesize amino acids into peptide chains under the guidance of mRNA. RNA accounts for about 82% of the total RNA.

3. RNA does not perform its function when it exists alone, it combines with a variety of proteins into ribosomes, and serves as an "assembly machine" for protein biosynthesis.

The RNA is synthesized in the nucleolus, and the precursor RNA is sheared in the nucleus to form mature RRNA, as shown in the figure below.

In the composition of the nucleus, it has functions such as RNA synthesis and processing, and the ribosomal subunit group

a.Nuclear membrane. b.Nuclear matrix.

c.Chromatin.

d.Nucleolus. Correct answer: Nucleolus.

RNA – also called ribosomal RNA

It is the nucleolus of the DNA that is made up of spring and letters.

Transcription from the formation zone first forms a precursor, and then after processing, forms mature RNA, enters the cytoplasm and combines with proteins to become ribosomes, which is the place where protein synthesis is formed. 80% of total RNA

Prokaryotes. There is only one RNA polymerase, and eukaryotes have 3 different RNA polymerases. Here are the three RNA polymerases for eukaryotes:

1. RNA polymerase I: located in the nucleus.

The nucleolus catalyzes the synthesis of RNA precursors, and the precursors of RNA are reprocessed into 28s and transcription without hydrolysis of ATP

2. RNA polymerase: catalyze the transcription of all the coding proteins of the wheel genes, synthesize mRNA precursors, and then process them into mRNA; RNA polymerase also synthesizes some small nuclear RNAs that are involved in RNA splicingHydrolysis of ATP is required to initiate transcription

3. RNA polymerase: located outside the nucleolus, catalyzes the transcription of genes encoding tRNA, 5SRRNA and small RNA molecules. Initiation of transcription does not require hydrolysis of ATP

The RNA of prokaryotes is divided into three categories: 5SRNA, 16SRRNA, and 23SRRNA.

There are four types of RNA in eukaryotes: 5SRNA, and 28SRRNA.

s is a physical unit of macromolecular substances in ultracentrifugal sedimentation, which can indirectly reflect the size of the molecular weight.

The ribosomes of both prokaryotes and eukaryotes are made up of two subunits, large and small.