DNA is composed of nucleotides that contain a phosphate group, five-carbon sugar called deoxyribose, and nitrogenous bases including adenine, guanine, thymine and cytosine. The nucleotides are linked by the phosphate group to form the backbone of the DNA double helix structure.

1. DNA

2. This is
the five-carbon sugar
found in RNA.

3. This is
the five-carbon sugar
found in DNA.

4. 1-Basic chemical units
A 5 carbon sugar - deoxyribose
1-Basic chemical units
phosphate - link between sugars
bases: purines = adenine and guanine
pyrimidines = thymine and cytosine

5. .
Nucleotides

6. This is
the five-carbon sugar
found in RNA.

7. This is
the five-carbon sugar
found in DNA.

8. How are they
different?