Biology / Unit 1 Bio 0221 short lesson, about 20 seconds
DNA and RNA
Captions available
The idea
DNA and RNA are the two nucleic acids built from nucleotide chains, differing in sugar, strand count, and one of four bases.
In practice
DNA carries deoxyribose, usually pairs into two strands, and uses thymine; RNA carries ribose, usually stays single-stranded, and uses uracil instead.
Where people slip
This unit stops at nucleic-acid structure — DNA replication and RNA's role in protein synthesis are later units' work.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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