CBSE 2024 · Region 5 · Set 1 · Q26 · 3 marks
(a)Why does DNA replication occur within a replication fork and not in its entire length simultaneously ?(b)"DNA replication is continuous and discontinuous on the two strands within the replication fork." Explain with the help of a schematic representation.
(a)
Why does DNA replication occur within a replication fork and not in its entire length simultaneously ?
(b)
"DNA replication is continuous and discontinuous on the two strands within the replication fork." Explain with the help of a schematic representation.
Marking-scheme solution
(a)
Energetically very expensive process or there is requirement of high energy in the process of replication
(b)
DNA-dependent DNA polymerases catalyses polymerisation according to template strand only in one direction that is $\displaystyle 5$' → $\displaystyle 3$', On one strand with polarity
$\displaystyle 3$' → $\displaystyle 5$', the replication is continuous, while on other strand with polarity $\displaystyle 5$' → $\displaystyle 3$' the replication is discontinuous
Molecular Basis of InheritanceReplicationUnderstandshort_answermedium
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CBSE Class 12 Biology past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.