1.2 Protein Synthesis
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what does RNA stand for
Ribonucleic Acid
RNA structure
single stranded COPY of DNA
the four RNA nitrogenous bases are
• Adenine • Uracil • Guanine • Cytosine
u pairs with
a
a pairs with
u
g pairs with
c
c pairs with
g
the three types of RNA are
mRNA - messenger RNA rRNA - ribosomal RNA tRNA - transfer RNA
the two stages of protein synthesis are
• transcription • translation
where does transcription happen
inside the nucleus
where does translation happen
inside the cytoplasm
transcription is
the process of making a copy of DNA
transcription steps
1 - the gene in the nucleus unwinds to expose the bases 2 - free mRNA nucleotides in the nucleus make a complementary strand of DNA 3 - mRNA leaves the nucleus through a pore
translation is
when genetic information encoded in mRNA is used to create a specific sequence of amino acids
steps of translation
1 - The mRNA attaches to a ribosome in the cytoplasm 2 - The tRNA attaches its anticodon to the matching codon of the mRNA 3 - The tRNA releases its amino acid and a peptide bonds form between the other amino acids to form a protein
3 bases on DNA is
triplet
3 bases of mRNA is
codon
3 bases of tRNA is
anti-codon
start code
AUG (Methionine)
RNA takes information from
nucleus to ribosome
cytoplasm is
everything in the cell except for the nucleus
what are the ‘building blocks’ for proteins
amino acids
RNA polymerase is
an enzyme that constructs mRNA in the nucleus