As all (21) amino-acids need a diferent code. As there are only 4 bases, if each code was only made up of 2 bases that would only allow 16 different codes, to few. So must be triplet, allow 64 possible codes- more then nough
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What does 'degenerative code' mean?
Each amino-acid has more then one triplet code, some codons also code for 'stop' or 'start' signals
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Three structural differences between DNA and RNA?
DNA: double stranded nucleic acid, deoxyribose sugar, thyamine base/ RNA: single stranded nucleic acid, ribose suger, uracill base
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What are the two major functions of DNA?
Replication, in dividing cells and carrying information in protein synthesis in all cells
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Explain the 'Semi-conservative replication' hypothesis?
Each new DNA mollecuel is made of one strand of original and one strand of 'new' matterial
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What happens during semi conservative replication?
Hydrogen bonds holding base pairs together break; two halfs of DNA mollecuel separate. Causes DNA to unwind; DNA-pollymerase catalyses addition of free nucleotide to explosed bases
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Other cards in this set
Card 2
Front
What does 'degenerative code' mean?
Back
Each amino-acid has more then one triplet code, some codons also code for 'stop' or 'start' signals
Card 3
Front
Three structural differences between DNA and RNA?
Back
Card 4
Front
What are the two major functions of DNA?
Back
Card 5
Front
Explain the 'Semi-conservative replication' hypothesis?
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