What happens in cells?

Chromosomes are really long molecules of DNA

DNA- chemical all genetic matter is made up from 

- contains coded information

- found in the nucleus of all plant and animal cells in long structures called chromosomes. 

DNA is a polymer - made of 2 strands coiled together in the shape of a double helix. 

e.g. haemoglobin is found in red blood cells. This binds to oxygen allowing red blood cells to transport it around the body. 

Structure

• Made from 2 strands. 
• Strands are joined together by bases.
• The strands are then twisted together.
• Forming a shape known as a double helix. 

DNA - made from small units called nucleotides. This means DNA is a polymer. 

Nucleotide - made of sugar, a phosphate group and a base.