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Transcript
TRANSCRIPTION AND TRANSLATION
RNA
single stranded helix
made of nucleotides consisting of ribose sugar, phosphate group and
a nitrogen base
nitrogen bases adenine, uracil, cytosine and guanine
occurs throughout the cell
three types
messenger RNA (mRNA) – leaves the nucleus and travels to
ribosomes carrying the sequences of bases to assemble
amino acids in a protein
ribosomal RNA (rRNA) – located in the ribosome, serves as a
dock for mRNA to be read by tRNA
transfer RNA (tRNA) - matches up complimentary nitrogen bases
and assembles sequence of amino acids
transcription – making RNA from a DNA blueprint in the nucleus
1. Helicase enzyme unzips double stranded DNA molecule.
2. RNA polymerase enzyme assembles complimentary nitrogen bases
(A-U, G-C)
3. mRNA results
translation – mRNA is a template for tRNA to assemble sequences of amino acids to
make a protein
1. mRNA travel to the ribosome and docks with rRNA
2. anti codon (3 complimentary bases) match with codon on mRNA. These
3 nitrogen bases on mRNA code for a specific amino acid. tRNA interprets
this code and assembles the correct sequence of amino acids to make a
certain protein.
3. Result is a protein being made