A single basic unit or “building block” of DNA consists of a sugar , a phosphate group and a base. Sugars are rings of carbon and oxygen atoms. The sugar in DNA has 5 carbon atoms (labelled 1′ – 5′), and is called deoxy-ribose (hence the “Deoxy-ribo” in DNA).

What does DNA contain of?

What is DNA made of? DNA is made of chemical building blocks called nucleotides. These building blocks are made of three parts: a phosphate group, a sugar group and one of four types of nitrogen bases. To form a strand of DNA, nucleotides are linked into chains, with the phosphate and sugar groups alternating.

Does DNA have A 3 carbon?

BOTH sugars have an -OH group on the 3′ carbon, which will be involved in binding. The 5′ carbon is a sidegroup off the ring. – Nitrogenous Base: each nucleotide has a single nitrogenous base attached to the 1′ carbon of the sugar. … DNA nucleotides may carry A, G, C, or T.