mtDNA point mutations can occur in mRNA genes, tRNA genes, rRNA genes, and gene regulatory sequences

The number of states encoding the tRNA gene in mtDNA is (). Piece.

Limbs. Piece. Piece. Correct Calendar Closed Mu Answer: D

Answer]: In eukaryotes, RNA polymerase catalyzes the synthesis of precursor RRNA; RNA polymerase The transcript is 45 S rRNA, which is spliced to produce all kinds of RNA except 5 S RRNA. The RNA genes of eukaryotes are a class of moderately repetitive genes, with hundreds to tens of thousands of copies, compared to about 300 copies of the human RNA gene.

RNA polymerase catalyzes the synthesis of precursor mRNA. Precursor tRNA is produced by RNA polymerase, which is processed to become mature tRNA. The mechanism of eukaryotic gene transcription.

In eukaryotes, RNA polymerase catalyzes the synthesis of precursor RRNA; RNA polymerase The transcript product is 45 srRNA, which is spliced to produce a variety of rRNAs except 5srRNA. The RNA genes of eukaryotes are a class of moderately repetitive genes, with hundreds to tens of thousands of copies, compared to about 300 copies of the human RNA gene.

RNA polymerase catalyzes the synthesis of precursor mRNA. Precursor tRNA is produced by RNA polymerase, which is processed to become mature tRNA.

Post-transcriptional processing:

There are four types of RNA in eukaryotes: 5S and 28S. The genes of the 28s form a transcription unit (precursor molecule), and the post-transcriptional processing of the precursor that produces the 45s consists of the precursor RNA binding to the protein before cleavage and methylation.

Precursor tRNA processing includes: (2) cutting off both ends of the tRNA by endonuclease; (2) Exonuclease from 5'Quietly cut off the additional sequences one by one; (3) In 3'CCA-OH structure is added at the end; (4) Base modification reaction.

There are the following types of modifications of precursor tRNA: (1) Pre-tRNA 3'The u at the end is replaced by CCA; (2) Purine base or ribose C2'methylation; (3) Uridine is reduced to dihydrouridine (DH) or translocation reaction within nucleoside to become pseudouracil nucleoside (T); 4) The deamination of certain adenylates becomes sub-amp imp.

Post-mRNA transcriptional processing includes: (1)5'end caps; (2)3'Poly A at the end; (3) splicing of introns; (4) RNA, etc.

There are more than three bases on the tRNA, in addition to the three bases of the anticodon, there are many other bases, and the lack of jujube is very clearly reflected in the one-volt group segmentation of the Compulsory 2 gene expression in the newcomer's education version (in the structural pattern diagram of the tRNA). You can look up the textbook.

There are two ways for genes to control traits, one is the indirect pathway, that is, genes control metabolism by controlling the synthesis of enzymes, and then control the genetic traits of organisms. Such as a lack of tyrosinase leading to albinism, or gray hair. Second, the direct pathway is that genes control the genetic traits of organisms, such as cystic fibrosis, by directly controlling the nodule foci of proteins.