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Escherichia coli fully labelled with 15N is allowed to grow in 14N medium. The two strands of DNA molecule of the first generation bacteria have
[1992]
  • a)
    different density and do not resemble parent DNA
  • b)
    different density but resemble parent DNA
  • c)
    same density and resemble parent DNA
  • d)
    same density but do not resemble parent DNA
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Escherichia coli fully labelled with 15N is allowed to grow in 14N med...
After one generation in 14N medium DNA of bacteria settled at a level intermediate between heavy and light bands due to semi conservative DNA replication.
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Escherichia coli fully labelled with 15N is allowed to grow in 14N med...
Explanation:
When E. Coli is fully labelled with 15N and allowed to grow in 14N medium, the first generation bacteria produced have two strands of DNA molecule, one strand is heavy with 15N and the other strand is light with 14N.

The two strands of DNA molecule of the first generation bacteria have different density due to the presence of different isotopes of nitrogen in them. The heavy strand has more nitrogen-15 isotope which makes it denser than the light strand which has more nitrogen-14 isotope.

As a result, the two strands of DNA molecule of the first generation bacteria do not resemble the parent DNA because one strand is heavier than the other, making them different in density and composition.

Therefore, option A is the correct answer.
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Escherichia coli fully labelled with 15N is allowed to grow in 14N med...
Ans A
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Escherichia coli fully labelled with 15N is allowed to grow in 14N medium. The two strands of DNA molecule of the first generation bacteria have[1992]a)different density and do not resemble parent DNAb)different density but resemble parent DNAc)same density and resemble parent DNAd)same density but do not resemble parent DNACorrect answer is option 'A'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Escherichia coli fully labelled with 15N is allowed to grow in 14N medium. The two strands of DNA molecule of the first generation bacteria have[1992]a)different density and do not resemble parent DNAb)different density but resemble parent DNAc)same density and resemble parent DNAd)same density but do not resemble parent DNACorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Escherichia coli fully labelled with 15N is allowed to grow in 14N medium. The two strands of DNA molecule of the first generation bacteria have[1992]a)different density and do not resemble parent DNAb)different density but resemble parent DNAc)same density and resemble parent DNAd)same density but do not resemble parent DNACorrect answer is option 'A'. Can you explain this answer?.
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