MORE HELPFUL LINKS FOR BIOLOGY ( Links are in ENGLISH )

1.Griffith's experiment on DNA

https://www.youtube.com/watch?v=4LU71ubTCZA

2.  DNA structure (it has subtitles)

https://www.youtube.com/watch?v=o_-6JXLYS-k

3. History of DNA- Griffith + Avert , McCarty & Macleod (has text written)

https://www.youtube.com/watch?v=M3zqxM8gcew

4. Hershey and Chase (has text written)

https://www.youtube.com/watch?v=Wxvd55XGrqc

5. Rosalind Franklin (it has subtitles)

https://www.youtube.com/watch?v=BIP0lYrdirI

6. PBS series on DNA- Episode 1:

https://www.youtube.com/watch?v=d7ET4bbkTm0

Hope it will be helpful for you .