DNA fragments generated by the restriction endonucleases in a chemical reaction can be separated by:
1. Polymerase chain reaction
2. Electrophoresis
3. Restriction mapping
4. Centrifugation

The DNA fragments separated on an agarose gel can be visualized after staining with:

1. Acetocarmine

2. Aniline blue

3. Ethidium bromide

4. Bromophenol blue

Gel electrophoresis is used for 
1. Isolation of DNA molecules.
2. Cutting of DNA into fragments.
3. Separation of DNA fragments according to their size.
4. Construction of recombinant DNA by joining with cloning vector.

Agarose extracted from sea weeds finds use in
1. Spectrophotometry
2. Tissue Culture
3. PCR
4. Gel electrophoresis

DNA fragments are 
1. Negatively charged
2. Neutral
3. Either positively or negatively charged depending on their size.
4. Positively charged.