the

The Discovery of the Structure of DNA

[Music]

we are in 1953 in Cambridge a city where

scientists are racking their brains to

corner what was known as yes that one

okay let's rewind a little several

researchers over many years discovered

that in the nucleus of our cells there

was a substance called DNA which

contained all our genetic information

and it was made of four compounds

adenine thymine cytosine and guanine how

was it possible that the whole book of

our life was written with just four

letters are celebrating friends James

Watson and Francis Crick thought that

maybe the answer was in the structure of

DNA and they were trying to solve this

for pieced puzzle that was driving all

the scientific community crazy they had

to close the first one was a discovery

made by erwin chargaff who found that in

all organisms he tested the relative

amounts of adenine and thymine were

equal and the same happened with guanine

and cytosine the second clue came from

rosalind Franklin an experienced chemist

who generated DNA crystals and shot

x-rays through them to study their

structure the x-ray picture showed a

repeated pattern which meant it was

something similar to a helix Watson and

Crick tried all the different possible

unions between a and T and G and C and

one was perfect to bonds between a and T

and three bonds between C and G would

fit in a helix a double helix indeed

also the full unit structured this way

could code a huge amount of data as a

dot in a - can compose a whole alphabet

in Morse code on top of these

discoveries specific pairings suggested

the copying mechanism for DNA for the

production of new cells and new life ten

years after the celebration in the pub

Watson Crick and Morris Wilkins the boss

of Franklin received the Nobel Prize for

this discovery and the DNA revolution

spread across every biology laboratory

in the world