You are presented with the question "What can change the structure of DNA?" and the following answer choices: 
- Mutations
 - rays or beams
 - Genes
 - radiation
 - DNA
 - Smoking
 - Microscope
 - Chemicals

Now knowing that mutations may change the structure of a chromosome or just change a single nucleotide and dNA is made up of nucleotides, choose the best answer.


 

 Mutations        