DNA fragments separated by gel electrophoresis are shown. Mark the correct statement :
1. Band 3 contains more positively charged DNA molecules than band 1.
2. Band 3 indicates more charge density than bands 1 and 2.
3. Band 1 has longer DNA fragment than bands 2 and 3.
4. All bands have equal length and charges but differ in base composition.
Answer:3. Band 1 has longer DNA fragment than bands 2 and 3.
