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Jump Start

B. A. Jump Start. Answer the following in your journal: What is causing the DNA strands to separate? Is label A pointing to the original DNA strand or the new one forming? Is label B pointing to the original DNA strand or the new one forming?. Review. RNA. RNA.

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Jump Start

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  1. B A Jump Start Answer the following in your journal: • What is causing the DNA strands to separate? • Is label A pointing to the original DNA strand or the new one forming? • Is label B pointing to the original DNA strand or the new one forming?

  2. Review

  3. RNA

  4. RNA RNA =_____________________ • Structural units = nucleotides Nucleotide – 3 part: • A sugar – ribose • A phosphate group • A ________________ base

  5. RNA • ______________ Bases – name source for the nucleotides • A = adenine • U = ___________ • C = cytosine • G = guanine

  6. RNA Types 3 types of RNA: • Messenger RNA (mRNA) – ________ genetic information ______ DNA in nucleus to ________; three base sequence called a _________ • Ribosomal RNA (rRNA)- makes up __________, where protein is made • Transfer RNA (tRNA)- transfers amino acids from the cytoplasm to the ribosome; its three base sequence is called an anitcodon

  7. Differences between…DNA & RNA • Deoxyribose Sugar • 2 strands • ____________ • Remains in nucleus Ribose Sugar 1 strand __________ _________ leave nucelus

  8. Transcription

  9. Transcription • DNA  mRNA (occurs in the _________) a. The complementary strand of RNA is built by the enzyme ____ ___________ • RNA polymerase binds to & separates the DNA strands at promoter sites • Promoter - 3 base sequence that serves as a starting and ending points for RNA to be made

  10. Transcription RNA polymerase uses one _______ of DNA as a ____________ to _______ the complementary strand of mRNA

  11. DNA contains… • __________ – nucleotide sequences that do ________ code for proteins • _________ – nucleotide sequences that do code for ___________

  12. RNA polymerase copies both introns and exons, but before mRNA leaves the nucleus… • Introns are cut out of the sequence • Exons are spliced (glued) back together to form the final mRNA

  13. mRNA travels to the ribosomes (outside of nucleus)

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