Question

Describe the structure of the D.N.A molecules​

Answer 1

Answer:

What is DNA made of? DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C)

Answer 2

‎ ‎ ‎ ‎ ‎ ‎‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎Structure of DNA molecule

• DNA molecule consists of two polynucleotide chains.
• These chains form a double helix structure.
• Nitrogenous bases in the centre are linked to sugar - phosphate units which form the backbone of the DNA.
• Pairing between the nitrogenous bases is very specific and is always between purine and pyrimidine linked by hydrogen bonds.
• Hydrogen bonds between the nitrogenous bases make the DNA molecule stable.
• Each turn of the double helix is 34 A° [3.4nm]. There are ten base pairs in a complete turn.
• The nucleotides in a helix are joined together by phosphodiester bonds.