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Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesized DNA. Which of the following types of chromatin is expected to become radioactive if cells are exposed to radioactive thymidine as soon as they enter the S-phase ?
[1998]
- a)Heterochromatin
- b)Euchromatin
- c)Both heterochromatin and euchromatin
- d)Neither heterochromatin nor euchromatin but only the nucleolus
Correct answer is option 'B'. Can you explain this answer?
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Radioactive thymidine when added to the medium surrounding living mamm...
Heterochromatin is a specialized chromosome material which remains tightly coiled and stains darkly in interphase. Euchromatin is that portion of the chromosome that stains with low intensity and uncoils during interphase. In the beginning of S-sphase, DNA replication occurs. DNA replication can occur in diffuse/ less tightly coiled euchromatin.
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Radioactive thymidine when added to the medium surrounding living mamm...
Explanation:
When radioactive thymidine is added to the medium surrounding living mammalian cells, it gets incorporated into the newly synthesized DNA. The incorporation of radioactive thymidine occurs during the S-phase of the cell cycle when DNA replication takes place.
Euchromatin:
Euchromatin is a loosely packed form of chromatin that is actively transcribed and is involved in gene expression. It contains genes that are actively being transcribed or are poised for transcription. During the S-phase, when DNA replication occurs, euchromatin is actively involved in DNA synthesis. Therefore, if cells are exposed to radioactive thymidine as soon as they enter the S-phase, the radioactive thymidine will be incorporated into the newly synthesized DNA in euchromatin. Hence, the euchromatin is expected to become radioactive.
Heterochromatin:
Heterochromatin is a tightly packed form of chromatin that is transcriptionally inactive. It contains genes that are not actively being transcribed. During the S-phase, heterochromatin is generally not involved in DNA replication. Therefore, if cells are exposed to radioactive thymidine as soon as they enter the S-phase, the heterochromatin is not expected to become radioactive as it is not actively replicating DNA.
Nucleolus:
The nucleolus is a specialized subcompartment of the nucleus involved in ribosome biogenesis. It contains the genes for ribosomal RNA (rRNA) synthesis. During the S-phase, the nucleolus is not directly involved in DNA replication. Therefore, if cells are exposed to radioactive thymidine as soon as they enter the S-phase, the nucleolus is not expected to become radioactive.
Conclusion:
In conclusion, when cells are exposed to radioactive thymidine as soon as they enter the S-phase, the radioactive thymidine is expected to be incorporated into the newly synthesized DNA in euchromatin. Therefore, the correct answer is option B - Euchromatin.
When radioactive thymidine is added to the medium surrounding living mammalian cells, it gets incorporated into the newly synthesized DNA. The incorporation of radioactive thymidine occurs during the S-phase of the cell cycle when DNA replication takes place.
Euchromatin:
Euchromatin is a loosely packed form of chromatin that is actively transcribed and is involved in gene expression. It contains genes that are actively being transcribed or are poised for transcription. During the S-phase, when DNA replication occurs, euchromatin is actively involved in DNA synthesis. Therefore, if cells are exposed to radioactive thymidine as soon as they enter the S-phase, the radioactive thymidine will be incorporated into the newly synthesized DNA in euchromatin. Hence, the euchromatin is expected to become radioactive.
Heterochromatin:
Heterochromatin is a tightly packed form of chromatin that is transcriptionally inactive. It contains genes that are not actively being transcribed. During the S-phase, heterochromatin is generally not involved in DNA replication. Therefore, if cells are exposed to radioactive thymidine as soon as they enter the S-phase, the heterochromatin is not expected to become radioactive as it is not actively replicating DNA.
Nucleolus:
The nucleolus is a specialized subcompartment of the nucleus involved in ribosome biogenesis. It contains the genes for ribosomal RNA (rRNA) synthesis. During the S-phase, the nucleolus is not directly involved in DNA replication. Therefore, if cells are exposed to radioactive thymidine as soon as they enter the S-phase, the nucleolus is not expected to become radioactive.
Conclusion:
In conclusion, when cells are exposed to radioactive thymidine as soon as they enter the S-phase, the radioactive thymidine is expected to be incorporated into the newly synthesized DNA in euchromatin. Therefore, the correct answer is option B - Euchromatin.
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Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesized DNA. Which of the following types of chromatin is expected to become radioactive if cells are exposed to radioactive thymidine as soon as they enter the S-phase ?[1998]a)Heterochromatinb)Euchromatinc)Both heterochromatin and euchromatind)Neither heterochromatin nor euchromatin but only the nucleolusCorrect answer is option 'B'. Can you explain this answer?
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Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesized DNA. Which of the following types of chromatin is expected to become radioactive if cells are exposed to radioactive thymidine as soon as they enter the S-phase ?[1998]a)Heterochromatinb)Euchromatinc)Both heterochromatin and euchromatind)Neither heterochromatin nor euchromatin but only the nucleolusCorrect answer is option 'B'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesized DNA. Which of the following types of chromatin is expected to become radioactive if cells are exposed to radioactive thymidine as soon as they enter the S-phase ?[1998]a)Heterochromatinb)Euchromatinc)Both heterochromatin and euchromatind)Neither heterochromatin nor euchromatin but only the nucleolusCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesized DNA. Which of the following types of chromatin is expected to become radioactive if cells are exposed to radioactive thymidine as soon as they enter the S-phase ?[1998]a)Heterochromatinb)Euchromatinc)Both heterochromatin and euchromatind)Neither heterochromatin nor euchromatin but only the nucleolusCorrect answer is option 'B'. Can you explain this answer?.
Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesized DNA. Which of the following types of chromatin is expected to become radioactive if cells are exposed to radioactive thymidine as soon as they enter the S-phase ?[1998]a)Heterochromatinb)Euchromatinc)Both heterochromatin and euchromatind)Neither heterochromatin nor euchromatin but only the nucleolusCorrect answer is option 'B'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesized DNA. Which of the following types of chromatin is expected to become radioactive if cells are exposed to radioactive thymidine as soon as they enter the S-phase ?[1998]a)Heterochromatinb)Euchromatinc)Both heterochromatin and euchromatind)Neither heterochromatin nor euchromatin but only the nucleolusCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesized DNA. Which of the following types of chromatin is expected to become radioactive if cells are exposed to radioactive thymidine as soon as they enter the S-phase ?[1998]a)Heterochromatinb)Euchromatinc)Both heterochromatin and euchromatind)Neither heterochromatin nor euchromatin but only the nucleolusCorrect answer is option 'B'. Can you explain this answer?.
Solutions for Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesized DNA. Which of the following types of chromatin is expected to become radioactive if cells are exposed to radioactive thymidine as soon as they enter the S-phase ?[1998]a)Heterochromatinb)Euchromatinc)Both heterochromatin and euchromatind)Neither heterochromatin nor euchromatin but only the nucleolusCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for NEET.
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Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesized DNA. Which of the following types of chromatin is expected to become radioactive if cells are exposed to radioactive thymidine as soon as they enter the S-phase ?[1998]a)Heterochromatinb)Euchromatinc)Both heterochromatin and euchromatind)Neither heterochromatin nor euchromatin but only the nucleolusCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesized DNA. Which of the following types of chromatin is expected to become radioactive if cells are exposed to radioactive thymidine as soon as they enter the S-phase ?[1998]a)Heterochromatinb)Euchromatinc)Both heterochromatin and euchromatind)Neither heterochromatin nor euchromatin but only the nucleolusCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesized DNA. Which of the following types of chromatin is expected to become radioactive if cells are exposed to radioactive thymidine as soon as they enter the S-phase ?[1998]a)Heterochromatinb)Euchromatinc)Both heterochromatin and euchromatind)Neither heterochromatin nor euchromatin but only the nucleolusCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
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