Presentation on theme: "DNA transcribes to RNA RNA translates to protein."— Presentation transcript:
DNA transcribes to RNA RNA translates to protein
Today’s Objectives Investigate and understand common mechanisms of protein synthesis.
Transcription DNA must be copied to messenger RNA (mRNA) mRNA goes from nucleus to the ribosomes in cytoplasm mRNA complements known as codons Only 3 nucleotide “letters” long Remember RNA has uracil (U) instead of thymine (T)! Interactive Animation, CLICK HERE! Genetic Science Learning CLICK HERE!
Transcription Reminders The template strand is the DNA strand being copied
Protein Translation Modified genetic code is “translated” into proteins Codon code is specific, but redundant! 20 amino acids CLICK HERE! Interactive Concepts in Biochemistry CLICK HERE!
tRNA structure 3-base code (triplet) is an “anticodon” Protein molecule Attached amino acid that is carried from cytoplasm to ribosomes
Protein Synthesis Overview Start: Ribosome binds to mRNA at start codon (AUG) Elongation: tRNA complexes bind to mRNA codon by forming complementary base pairs with the tRNA anticodon The ribosome moves from codon to codon along the mRNA. Amino acids are added one by one Release: release factor binds to the stop codon CLICK HERE! Thomson Brooks/Cole CLICK HERE!