DNA strands are antiparallel because of the p | vedclass

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(A) The two strands of $DNA$ molecules run in opposite or antiparallel directions. This structural orientation is maintained because the nitrogenous b

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$H$-bonds

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(A) The two strands of $DNA$ molecules run in opposite or antiparallel directions. This structural orientation is maintained because the nitrogenous bases of the two strands are joined together by hydrogen bonds ($H$-bonds) following the principle of complementary base pairing. While phosphodiester bonds hold the nucleotides together within a single strand,the antiparallel nature is specifically defined by the orientation required for the hydrogen bonding between base pairs.

List-$I$	List-$II$
$a$. Bacteriophage $\phi \times 174$	$i$. $48502$ base pairs
$b$. Bacteriophage lambda	$ii$. $5386$ nucleotides
$c$. Escherichia coli	$iii$. $3.3 \times 10^9$ base pairs
$d$. Haploid content of human $DNA$	$iv$. $4.6 \times 10^6$ base pairs

$DNA$ strands are antiparallel because of the presence of

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