Which of the given statement is correct in the context of visualising DNA molecules separated by agarose gel electrophoresis?
| 1. | DNA can be seen in visible light. |
| 2. | DNA can be seen without staining in visible light. |
| 3. | Ethidium bromide stained DNA can be seen in visible light |
| 4. | Ethidium bromide stained DNA can be seen under exposure to UV light. |
In agarose gel electrophoresis, DNA molecules are separated on the basis of their
1. charge only
2. size only
3. charge to size ratio
4. All of the above