PHYSCI 107 Lecture Notes - Lecture 2: Dna Replication, Metastasis, G2 Phase
13 Oct 2020
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Document Summary
Translation process: three phases of translation, initiation, elongation, termination. Start codon of mrna combines with small ribosomal subunit and first trna: codes for methionine with the base sequence aug. Small and large ribosomal subunits join and enclose the mrn a between them. Elongation phase of translation: 2nd trna brings another amino acid, its anticodon binds to 2nd codon of mrna, ribosomal enzymes remove 1st amino acid and attach it to the. 2nd with a peptide bond: ribosome moves along the codons repeating these steps, amino acids are added one at a time to the growing chain of polypeptides. Ribosome eventually reaches the stop codon at end of mrn a: polypeptide chain is released, subunits of ribosome separate, releasing mrna, mrna can be used over. Stages of a cell"s life cycle: stages include interphase, mitosis, and cytokinesis, cell division, form of cellular reproduction, increases numbers of cells, replaces old and damaged cells, requires duplication of genetic material (dna replication)
