BlogNEETImportant Topic of Biology: Transcription

Important Topic of Biology: Transcription

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    One of the most important discoveries made by science was the discovery of DNA. A deeper understanding of DNA structure has revealed the answers to questions that have been around for thousands of years.

    Central Dogma describes how DNA transmits information to mRNA and that proteins are produced in three phases: replication, transcription, and translation. Copying is the process of copying information from DNA to RNA after duplicating its two strands.

    Now let’s look at the meaning of the text, the classification of the text, and its features.

    What is transcription?

    It is a process of encoding a message with DNA in the form of mRNA. The machine is almost identical to DNA replication but there is a difference in the use of only one strand of DNA as a template. RNA polymerase is the main enzyme needed for this process.

    The RNA produced by this step contains all the information used for protein synthesis. This process of protein formation is called translation.

    RNA Polymerase

    The main enzyme involved in the synthesis of RNA polymerase. It forms a coherent RNA string from a single set of DNA. The promoter is bound to the DNA-based RNA polymerase, which causes polymerization in the image fiber 5 ′ to 3 ′. The process ends when it reaches the shortcut sequence, and the newly formed RNA thread is released.

    The transcription unit is a component of DNA that is converted into an RNA molecule. Its role is to record at least one gene. Consider that if you genetically engineer protein, writing produces mRNA. Code sequence may be present in a protein written by a DNA transcription unit. Transcripts have lower copying reliability than DNA duplication.

    Different regions of the DNA transcription unit

    Here are the different regions of the DNA transcription unit:

    Gene with structural function

    Two DNA genes have different names. A strand with 3′-5 ′ polarity becomes a thread fiber as RNA polymerase only creates one-sided polymerization, 5′-3 ′. Even if it does not have a code for anything, another strand with 5′-3 ′ polarity is changed at the time of writing and is called a coding strand. The parts of the facilitator and the shortcut of the recording unit are found on both sides of the genetic structure.

    • Promoter

    It is a DNA sequence found at the end of coding strand 5 ′ (upstream). It is the domain for binding RNA polymerase, and it is this site that directs the polymerase to start writing. The writing unit template and the coding thread are also defined by the presence of the developer.

    • Terminator

    It is a DNA sequence found at the end of the 3 ‘coding strand (downstream). It sends a stop signal and marks the end of the typing process. There may be additional directional orientation up or down the promoter stream.

    Stages of Transcription

    The recording is done by a series of enzymatic catalysts, i.e.,

    • Initiation

    RNA polymerase binds to DNA and slows down until it receives the advertiser sequence for identification. The first places to write are the ones that are named. The double helix of DNA is loosened, exposing all the bases in each DNA sequence. This serves as the starting point for the formation of a new mRNA thread.

    • Elongation

    Ribonucleotides are added to the image fiber, allowing mRNA to expand. Add the corresponding RNA nucleotide to the growing RNA record of all the nucleotides identified in the DNA model.

    • Termination

    When the RNA polymerase reaches the shortcut area, the recording stops. Both RNA and RNA polymerase transcription fall to this point. RNA polymerase forms a brief interaction with the ‘disconnect factor’ to complete transcription.

    RNA Processing

    Pre-mRNA is written RNA. It is then further processed into a mature RNA. The following are examples of RNA processing:

    • Capping

    A methylation guanine cap is inserted to preserve mRNA. Includes:

    • Methylated guanine is added
    • It is found at the end of 5 ′ mRNA encoding
    • It protects against the destruction of mRNA


    mRNA is also protected from poly-A tail destruction. Includes:

    • Endonuclease isolates mRNA locally.
    • PolyA polymerase is an enzyme that helps to increase the number of nucleotides in adenine.


    • Spliceosome excision is used to remove non-coding sequences, such as introns.
    • Ligation combines a sequence of code or exons together.

    As a result, a single pre-mRNA can produce several proteins. At the end of writing, mature mRNA is detected.

    What is replication?

    A two-stranded DNA molecule breaks down into two identical daughter strands during DNA replication. As a result, each daughter cell contains genetic information similar to that of the parent cell during cell division. DNA polymerase is a major enzyme involved in DNA replication. Each fiber receives additional nucleotides.

    In a cell, both DNA replication and transcription require a new copy of DNA. DNA transcription is involved in converting DNA into RNA, whereas DNA replication is the process by which one copy of a DNA. Both processes are involved in the synthesis of new nucleic acids, DNA or RNA. Newly developed nucleic acids are similar in appearance but differ in function. One is responsible for cell division, and the other is responsible for gene expression.

    Also read: Darwin’s Contribution


    Describe the RNA Polymerase Role in Writing?

    RNA polymerase is the first enzyme involved in transcription. It allows the synthesis of a corresponding RNA strand from the DNA molecule phase. The DNA-binding enzyme of RNA polymerase binds to the developer series in DNA and initiates polymerization within the 5 ’to 3’ study in the DNA strand template. Once it has reached the shortcut series the way it stops and releases the newly assembled RNA thread.

    How is DNA synthesized in Eukaryotes?

    Eukaryotes comprise a well-defined nucleus made up of DNA, a malignant polymer. This malignant polymer is wrapped with a histone octamer that is no doubt charged to form the nucleosome. Histone octamer is highly structured by arranging 8 molecules of histones (which can undoubtedly be a basic protein). Histones earn a lot of money as they are rich in amino acid residues including lysine and arginine. Nucleosomes form nucleosomes are then further synthesized, leading to the development of chromatin fibers.

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