Write the structures of fragments produced on complete hydrolysis of DNA. How are they linked in DNA molecule? Draw a diagram to show pairing of nucleotide bases in double helix of DNA.

Question

Write the structures of fragments produced on complete hydrolysis of DNA. How are they linked in DNA molecule? Draw a diagram to show pairing of nucleotide bases in double helix of DNA.,

MARKS App · Accepted Answer

A pentose sugar ( β -D-2-deoxyribose), phosphoric acid ( H 3 ​ PO 4 ​ ) and bases (nitrogen containing heterocyclic compounds) 349are produced on complete hydrolysis of DNA. Their structure is given below: (i) Pentose sugar $ (ii) Phosphoric acid im g src = " h ttp s : // c d n − q u es t i o n − p oo l . g e t ma r k s . a pp / m o d u l es / c b se / wP 4 s gv V c k I P u F 3 d P U Y 2 SE y m x o w e b KrD G e i g nj B r Ux z Q . or i g ina l . f u ll s i ze . p n g " > b r > ( iii ) N i t ro g e nba ses T h ere a re f o u r ba ses in D N A . A d e nin e ( A ) , G u anin e ( G ) , C y t os in e ( C ) an d T h y min e ( T ) . im g src = " h ttp s : // c d n − q u es t i o n − p oo l . g e t ma r k s . a pp / m o d u l es / c b se / J q e M K TC 2 a 7 w 0 s tZT z F f C d l Wb C 3 sc g Q V 7 m g Y M b 8 U H G z 8. or i g ina l . f u ll s i ze . p n g " > b r > im g src = " h ttp s : // c d n − q u es t i o n − p oo l . g e t ma r k s . a pp / m o d u l es / c b se / kj I D m J a KK Q Hy 5 g n g EGwC H ff ZGMl − u n lQ 30 i l D 30 W u lM . or i g ina l . f u ll s i ze . p n g " > b r > im g src = " h ttp s : // c d n − q u es t i o n − p oo l . g e t ma r k s . a pp / m o d u l es / c b se / U Sw A l d n A B Hyss Y 0 b Z e R 4 Tq k D 640 Va Z n 0 Z s S W oe i SN 3 Y . or i g ina l . f u ll s i ze . p n g " > b r > im g src = " h ttp s : // c d n − q u es t i o n − p oo l . g e t ma r k s . a pp / m o d u l es / c b se / Y − l U h 8 z bh g V A W L C c T U Et 9 r D ​ 3 q − X D g V 7 − f r 6 ikn I F 8 g . or i g ina l . f u ll s i ze . p n g " > b r > A u ni t f or m e d b y t h e a tt c hm e n t o f aba se t o 1 ′ − p os i t i o n o f s ug a r i sc a ll e d n u c l eos i d e . Wh e nn u c l eos i d e l ink s t o p h os p h or i c a c i d a t 5 ′ − p os i t i o n o f s ug a r m o i e t y , an u c l eo t i d e i s f or m e d . N u c l eo t i d es a re j o in e d t o g e t h er b y p h os p h o d i es t er l inka g e b e tw ee n 5 ′ an d 3^{\prime}$ carbon atoms of the pentose sugar. In DNA two nucleic acid chains are wound about each other and held together by hydrogen bonds between pairs of bases. The two strands are complementary to each other because hydrogen bonds are formed between specific pair of base. Adenine of one strand is hydrogen bonded to thymine of the other strand through two hydrogen bonds. Cytosine of one strand is hydrogen bonded with guanine of the other strand through three hydrogen bonds. Double stranded helix structure of DNA is represented as follows:

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