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NEET 2020 · BiologyPrevious Year Question

The sequence that controls the copy number of the linked DNA in the vector is termed

Answer: (D) Ori site. Answer: (D) Ori site Solution: The origin of replication (ori) is the sequence from where replication starts; it is also the sequence responsible for controlling the copy number of the linked DNA in a vector.

  1. A.Palindromic sequence
  2. B.Recognition site
  3. C.Selectable marker
  4. D.Ori site✓

Correct Answer

(D) Ori site

Solution & Explanation

Answer: (D) Ori site Solution: The origin of replication (ori) is the sequence from where replication starts; it is also the sequence responsible for controlling the copy number of the linked DNA in a vector. A palindromic sequence/recognition site is where restriction enzymes cut, and a selectable marker helps eliminate non-transformants — none of these governs copy number. (answer_source: external — NEET 2020 had no printed biology key; this answer is NCERT-derived.) NCERT Reference: Ch 9, p.169, line(s) 9 — "This sequence is also responsible for controlling the copy number of the linked DNA"

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