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NUCLEOTIDES
The nucleotides that are the building blocks of nucleic acids are formed by adding a phosphate group to a nucleoside.
Nucleotides containing ribose are known as ribonucleotides, and those containing deoxyribose are known as deoxyribonucleotides.
To summarize the structural differences between DNA and RNA:
 DNA (deoxyribonucleic acid)
Sugar is deoxyribose
DNA is a polymer of deoxyribonucleotides
Bases are adenine, guanine, cytosine and thymine
RNA (ribonucleic acid)
Sugar is ribose
RNA is a polymer of ribonucleotides.
Bases are adenine, guanine, cytosine and uracil (instead of thymine)
We will look at other differences between RNA and DNA in upcoming sections of the tutorial.
Now try Practice Problem #1 to see how much you've learned so far!
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