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How is the double helix made up?
How is the double helix made up?
Two outer strands of the ladder are formed by a chain of alternating sugar and phosphate links. The rungs of the ladder are formed from pairs of bases linked by weak hydrogen bonds. The base pairs are attached to the sugar molecules.
Purine
Purine
Made up of two fused rings of nitrogen, carbon and hydrogen atoms.
e.g. guanine and adenine
Types of RNA
Types of RNA
mRNA = messenger RNA
tRNA = transfer RNA
rRNA = ribosomal RNA
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Summary Life at a Molecular Level
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Detailed summary of life at a molecular level, for grade 12.
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