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STD 12 - 5. molecular basis of inheritance — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 5. molecular basis of inheritance4 Marks
MCQ
A $DNA$ molecule in which both strands have radioactive thymidine is allowed to duplicate in an environment containing non-radioactive thymidine. What will be the correct number of $DNA$ molecules that contain some radioactive thymidine after three duplications
  • A
    There will be four such molecules
  • B
    There will be eight such molecules
  • C
    There will be only one such molecule
  • ✓
    There will be two such molecules
✓

Answer

Correct option: D.
There will be two such molecules
d
(d)Because of semiconservative method of $DNA$ replication only $2$ molecules of $DNA$ will have some radioactive thymidine.

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