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Mutations are defects in the DNA or mRNA that cause the wrong protein to be made.

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This is the finished protein. It isn't 5 or 6 peptides long, it could be hundreds, thousands at most.

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After the mRNA is finished, it is modified to remove any sections that we don't need (exons) and we are left with the things that we only need (introns).

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As the tRNA (Transfer RNA) enters the ribosome and it matches, it leaves behind the peptide and it creates a long chain of peptides, often hundreds of length, then it cuts of and it is ready to be used.

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After the mRNA is modified, then the mRNA is now ready for translation once it leaves the nucleus.

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mRNA first leaves the nucleus and meets a ribosome.  5' goes into the ribosome first. Another type of RNA, the Transfer RNA (tRNA) enters the ribosome. If the tRNA doesn't have the right amino acid it quickly leaves the site. This is repeated until the correct amino acid carrying tRNA is found. This is done about 100,000 times, so it isn't a concern for time. tRNA continue from the A site to the P site where their amino acid is connected to the other amino acids of the chain. Then the empty tRNA  exits the ribosome via the E site.

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Translation is the process of how mRNA creates protiens

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The polymerase copying a section of a gene.
It has a cap and a tail to keep it together once the mRNA leaves the nucleus.

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Transcription begins with a DNA polymerase finding the promoter for the beginning of a gene in the DNA. The polymerase then attaches to the start codon of the gene and copies the information onto a strand of messenger RNA.

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I couldn't get my part of the video done. Just read this.

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DNA is made of small molecules called nucleotides. These nucleotides are made of three parts, the phosphate group, the sugar, and the nitrogen base that will can be adenine, guanine, thymine, or cytosine.These molecules are connected via phosphate bonds. The nitrogen base connects to another nitrogen base on the opposite side in an double helix running anti parallel, meaning they run in opposite directions.