Qu'est-ce qu'une molecule d'ADN ?

« / H V E LRORJLVWH V DWWULE XH QW j O $ ' 1  G H X[  U{OHV I RQG DPH QWDX [   LO H VW OH  V X S S R U W  G H  O L Q I R U P D W L R Q  J p Q p W L T X H  H W S H UPHW OD  W U D Q V P L V V L R Q  G H V  L Q I R U P D W L R Q V  J p Q p W L T X H V  G H  FHOOXOH  H Q FHO OXOH  H W G H  J p Qp UDWL RQ H Q J p Qp UDWLRQ  6 X S S R U W  G H  O L Q I R U P D W L R Q  J p Q p W L T X H  & H VW O DV VHPE ODJ H  G H V E DVH V OH V XQH V S DU  UDS S RUW DX[  DXWU H V T XL G p WH UPLQH OH FRQWHQ X G H  FHW WH  LQI RUPDW LRQ  QRWDPPH QW DX WUDY H U V G H V J q QH V $ LQVL VHORQ O RUG UH G H  VXFF H VV LRQ G H V E DVH V O LQI RU PDWLRQ T XH  O $ ' 1  FRQWLHQW QH  VHUD S DV OD PrPH   S DU  H [ H PS OH O RUG UH $ $ $ * $ 7 &* $  H VW G LI I p UHQ W G H  $ 7 $ * $ $ * &$  &H FRGH  J p Qp WLT XH  S H UPHW H Q S DUWL FXOLHU  OD V\Q W Kq VH G H  S URWpL QH V F H OOHFL S DV VH G DE RUG  S DU OD WUDG X FWLRQ  G H  O $ ' 1  H Q $ 51  PHVVDJ H UT XL S DVVH G DQV OH F\WRS ODVPH R LOH VWWUDQ V F ULWH Q S URWpLQH V  7 U D Q V P L V V L R Q  G H  O L Q I R U P D W L R Q    O D  U p S O L F D W L R Q  / H  PDLQW LHQ  G H  O LQI RU PDWLRQ J p Qp WLT XH  G DQV  O RUJ DQL VP H  H W VD WUDQV PLV VLRQ VRQW D VV X UpV S DU OD  FDS DFLWp T X D XQH  FHOOXOH  G H  I RUPHU G H X[  PROpFXOH V G $ ' 1  D\ DQW OD Pr PH VpT XH QFH j S DUWLU G XQ H  VHXOH  &H  S URF H VV X V E LRFKLP LT XH  DS S H Op UpS OLFDWLRQ H VW I RQG p  VXU OD S URS ULpWp  G H  FRP S OpPH QWDULWp  G H V E DVH V $ 7  H W * & , O I DLW LQWH UY H QLU XQ E ULQ G $ ' 1  FKU RPR VRP LT XH  G H V E DVH V $  *  7  H W & OLE UHV H W S OXVLHXU V H Q]\PH V FDWDO\ VDQW FHWWH  UpD FWLRQOH V$ ' 1  S RO\ PpUD VHV 3RXU T XH  OD UpS OLFD WLRQ S XL VV H  DY RLU OLHX  OHV G H X[  E ULQV  G H  OD PROpFX OH G $ ' 1  V RXY UHQ W  XQ S H X FR PPH XQ H  I H UPHWXUH  j J OLVV LqUH  &KDT XH  E ULQ H V W DORU V S DUFRX UX S D U XQH  PROpF XOH  G XQ H  H Q]\PH  VSp F LI LT XH  O $ ' 1  S RO\ PpUDVH  &HWWH  G H UQLq UH V\Q WKp WLVH XQ QRXY H DX E ULQ FRP S OpPH QWDLUH  G X S UHPLH U H Q DFFRODQW E RXW j E RXW G H V E DVH V OLE UH V j OD I LQ G X S U RFHV VXV D X OLHX  G XQ H   LO \  D G p VRU PDL V G H X[  P ROpFXOH V  G $ ' 1    FKDF XQH  H V W FRQV WLW Xp H  G XQ  E ULQ QRXY H OOHPH QW I RUPp H W G XQ  E ULQ DQFLH Q  OD UpS OLFDWLRQ H VWG LWH VHPL FRQV H UY DWLY H  / D  U p S O L F D W L R Q  S H UPHW G H  I RUPHU j S DUWLU G XQ H  FHOOXOH   PqUH  G H X[  FHOOXOH V I LOOHV S RVV p G DQW OHV PrPH V FKURP RVR PHV G DQV OH VTX H OV XQ E ULQ S URY LHQ W G H  OD FHO OXOH  PqUH  H W O DX WUH H VW Q RXY H OOHPH QW V\Q WKp WL Vp S DU DLOOH XUVLG H QWLT XH Vj  FHX[  G H  OD FHOOXOH  PqUH  & H VW FH  PpFDQ LVP H   T XL H [ S OLT XH  F RPPHQ W O LQI RU PDWLR Q J p Qp WLT XH  H VW FRQV H UY p H  G DQV  WRXWH V OH V FHOO XOH V G H  O RUJ DQLVPH  OHVT XH OOHV Y RQW S H UPHWW UH OD WUDQV PLV VLRQ  G H  FHWWH  LQI RUPDWLRQ j OD G H V FHQG DQFH  F HV W O Kp UpG LWp  / D  UpS OLFDWL RQ H VW  G H  OD PrPH  I DoR Q j O RULJ LQH  G H  OD S H UPDQH QFH G H V  FDUD FWpULVW LT XH VJ ORE DOH V  G H  FKDT XH  H VSq FH DQLPDOH  Y p J p WDOH  Y LUDOH  RX E DFWp ULHQ QH . »