Single nucleotide strand Sugar: Ribose 4 Bases: –A: Adenine –G: Guanine –C: Cytosine –U: Uracil U replaces T Three Types of RNA.

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Single nucleotide strand Sugar: Ribose 4 Bases: –A: Adenine –G: Guanine –C: Cytosine –U: Uracil U replaces T Three Types of RNA

mRNA Function: Copies the DNA code and moves to a ribosome Link between DNA & Protein Allows ribosome to create a protein Location: Starts in nucleus… moves to ribosome

tRNA Function: Transfers amino acids from the cytoplasm to the ribosome Ribosome will link amino acids together to form a protein Location: Cytoplasm Amino acid Proline Amino acid Serine

rRNA Function: components of ribosomes

Transcription Defined: Process of making mRNA from DNA Step 1: RNA Polymerase separates the DNA nucleotides Step 2: Free floating RNA nucleotides match with the DNA Reminder: U replaces T Step 3: mRNA breaks free in separate pieces Step 4: mRNA processing takes place –Unused portions (introns) are removed and the used portions (exons) bond together Step 5: Final mRNA strand travels to ribosome Step 6: DNA recombines to be used again U| G|G| C| A| G|G| U| C| A| U| C| G|G|

RNA polymerase

Transcription Animation

Transcription Video Click if video won’t play

DNA vs. RNA Double Stranded Sugar: Deoxyribose Bases: A T C G Location: Nucleus Single strand Sugar: Ribose Bases: A U C G Location: Nucleus & Cytoplasm

Review Name three different ways that DNA and RNA differ. Which RNA: –is found inside the nucleus? –transports amino acids to the ribosome? –exits the nucleus to the ribosome? –copies the DNA code? –makes up the structure of ribosomes? Perform transcription by using the following piece of DNA. Introns are underlined. Write the final strand of mRNA created. T A C C G T A C A A T G G G A T C

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