more DNA info b4 transcription n translation (7.1)

3 types of RNA

• mRNA

• tRNA

• rRNA

what does mRNA do

• carries genetic info from DNA to ribosomes for protein synthesis

what does tRNA do

• brings specific amino acids to the ribosome to build proteins

what does rRNA do

• forms core of ribosome structure

• catalyzes protein synthesis

how does protein synthesis work

DNA → RNA → proteins

1. transcription (DNA → RNA)

2. translation (RNA → protein)

codon

group of 3 nitrogenous bases that an specify amino acid (ex. AGU)

initiation and termination codons

• initiation: AUG

  • codes for methionine

• termination: UAA, UAG, UGA

  • no amino acids attached

anticodons

• 3 nucleotides on tRNA that match the codon on mRNA

wobble hypothesis

• third base in a codon may vary while still coding for the same amino acid

• not all codons need a separate tRNA