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DNA & RNA
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DNA
Structure Double stranded (long) Nucleotides – deoxyribose, phosphate, Nitrogen base Nitrogen bases
Adenine Thymine Cytosine Guanine
Function Stores genetic information Transfers genetic info.
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RNA
Structure Single stranded (short) Nucleotides – ribose, phosphate, Nitrogen base Nitrogen bases
Adenine URACIL Cytosine Guanine
Function Carries genetic information from nucleus to ribosome
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3 types of RNA
1- mRNA = messenger RNA
2- rRNA = ribosomal RNA3 – tRNA = transfer RNA
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By controlling PROTEIN SYNTHESIS…..
DNA controls cellular structure and function
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THE GENETIC CODE
The “code” refers to the message in the
RNA (not DNA)
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Genetic Language
CODON“triplet” code with 3 RNA bases
Acts as a word in the genetic language
Each codon codes for a specific amino acid
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Ribosomes of any living creature can produce protein from any creature’s RNA………..
AMAZING HUH?
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Reading the DNA code
Codon Dictionary
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Reading the DNA code
Codon Dictionary
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Find the following amino acids
1- TAC
2-TGG
3-AAA
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Find the following amino acids
1- AAT
2-ACG
3-ACT
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Special codons
AUG Start – tells us to start making a new protein here
If used after a stop codon Methonine – met – amino acid
UAA, UAG,UGA Stop – tells the cell to stop making protein here