L12 DNAII - Chapter 12 Lecture Guide DNA-II: Transcription...

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Chapter 12 Lecture Guide DNA-II: Transcription I. Revisiting the nucleus a. Site of DNA location i. DNA is organized into chromosomes 1. chromatin a. DNA plus a complex of proteins b. Contains the nucleolus (can be more than one depending on species) i. rRNA (ribosomal RNA is made using instructions in DNA) ii. proteins brought in from the nucleolus are assembled with the rRNA into small and large units c. nuclear pores Nucleus Transcription occurs Ribosomal units made RNA= mRNA tRNA rRNA d. Overview of transcription and translation: i. Transcription results in pre- mRNA ii. Pre-mRNA is modified to make the final mRNA iii. mRNA leaves the nucleus and enters cytoplasm II. The Genetic Code a. Only four nucleotide bases to describe 20 different amino acids b. Codons i. Triplet code- 3 bases= 1 codon 1 amino acid AUG-start codon UAA UAG stop UGA 1
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Chapter 12 Lecture Guide III. Transcription a. The synthesis of RNA from DNA (making a copy of the original code) i. Occurs in the nucleus ii. Both nucleic acids share the same language
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L12 DNAII - Chapter 12 Lecture Guide DNA-II: Transcription...

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