Question

describing the structure of dna
complete the sentences to describe the structure of dna.
the shape of the dna molecule is called a double
the backbone of dna is made of molecules and phosphate molecules.
the
ungs\ of dna are made of

Explanation:

• DNA has a double - helix shape. This was discovered by Watson and Crick.
• The backbone of DNA consists of sugar (deoxyribose) and phosphate molecules. The sugar - phosphate backbone provides structural support.
• The "rungs" of the DNA ladder are made of nitrogenous bases. There are four types: adenine (A), thymine (T), cytosine (C), and guanine (G).

Answer:

1. helix
2. sugar (deoxyribose)
3. nitrogenous bases