3 5 bio notes

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3 5 bio notes

  1. 1. Urwa Mesret 3.5 Bio notesTranscription is where the gene is converted into a mRNAmessenger which is posted to the ribosomes which occurs innucleus.Translation occurs when ribosomes translate the message intoa polypeptide which occurs in the cytoplasm.  The sequence of amino acids is determined by the genes which are codes for making polypeptide.DNA – double helix & Thymine pairs with AdenineRNA- single strand & bases Uracil replaces ThymineTranscription is where a polymerase makes a mRNA moleculethat is complementary to the DNA.Translation is where mRNA is posted out of the nucleus and attaches to ribosomes. Ribsomes use complementary base-pairing to ‘read’ codons on the mRNA. tRNA transfer molecules with corresponding anti- codons bring the correct amino acid. DNA is transcribed in triplets- sequence of three bases which gives mRNA codons- sequence of three RNA bases. mRNA codons make up genetic code. The genetic code: all living things use the same code and same bases. Codons code for the same amino acids. There are 64 codons but 20 amino acids.

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