AP Biology

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Describe the production and processing of a protein that will be exported from a eukaryotic cell. Begin with the separation of the messenger RNA from the DNA template and end with the release of the protein at the plasma membrane.
-in essay format not points please-

  • AP Biology -

    it leaves the nucleous into the rough endoplasmic reticulum into a vesicle into the golgi aparatus then out the cell

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    THE FIRST ANSWER IS RIGHT JUST PUT MORE DETAILS IN IT

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    Production of Protein:
    Protein Synthesis
    1. transcription (could image as to photocopy a page named RNA of a book called DNA)
    2. translation (read page named RNA and turn it into protein)

    Transcription:
    Creation of mRNA in a nucleus of a cell.
    Done by enzyme RNA polymerase and ligase, copy the code of the DNA. Uracil is used in mRNA instead of Thymine in DNA
    Remove introns from mRNA, and thus activate the mRNA to be mature.

    Translation:

    Ribosome:
    60s subunit + 40s subunit make up 80s subunit (because of overlapping of the subunits)

    three nucleotides make up one codon (codon is universal)
    one codon codes for one amion acid
    20 amino acid makes a protein

    at least 60 nucletide, 20 codon

    AUG is the start codon

    1. Initiation- ribosome will associated with the mRNA, the codon will into the P paliment site; second codon move into A paliment site.
    tRNA goes into the paliment site followed by a tRNA entering the A paliment site.

    2. A peptide bond is created between the amino acids.
    3.Elongation
    The tRNA in the Palliment site leaves.
    4. Termination
    Continue until A palliment site reach a stoop codon.
    mRNA recycled, and broken down


    then;


    Endoplasmic reticulum:
    An elaborate series of membrane sacs (canals) that run from the nuclear membrane to the cell membrane; acts to transport newly sysnthesized material, may undergo further processing inside ER Lumen, and may be important to cell support; its internal space ie. the ER Lumen may account for 10% of the entire cytoplasmic volume.

    Main Funtion: transport

    The rought ER(not smooth ER) , + ribosomes which makes proteins (the rought ER does not make proteins) destined for secretion outside the cell

    To the Golgi apparatus and out the cell

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