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NEET AIPMT SOLVED PAPER 1998

  • question_answer
                    Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesised DNA. Which of the following types of chromatin is expected to become radioactive if cells arc exposed to radioactive thymidine as soon as they enter the S phase?

    A)                                                                                                                                                                                              Neither heterochromatin nor euchromatin but only the nucleolus

    B)              Heterochromatin               

    C)              Euchromatin        

    D)              Both (b) and (c)

    Correct Answer: C

    Solution :

                In the beginning of S phase, DNA replication occurs. DNA replication can occur in diffuse/less tightly coiled euchromatin.           


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