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Question
Animal cells uses thymine primarily for the synthesis of DNA. A group of sea urchin eggs was fertilized in sea water containing radioactive thymine. Following fertilization, samples of embryos were removed at regular intervals and the radioactivity in the nucleic acid was measured in counts per minute. The results obtained are shown in the given figure.
The radioactivity of the embryos increases with time probably results from
Animal cells uses thymine primarily for the synthesis of DNA. A group of sea urchin eggs was fertilized in sea water containing radioactive thymine. Following fertilization, samples of embryos were removed at regular intervals and the radioactivity in the nucleic acid was measured in counts per minute. The results obtained are shown in the given figure.
The radioactivity of the embryos increases with time probably results from
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Solution
The correct option is E Incorporation of radioactive thymine in new DNA during replication
Animal cells uses thymine primarily for the synthesis of DNA. A
group of sea urchin eggs was fertilized in sea water containing radioactive thymine. Following fertilization, samples of embryos were removed at regular intervals and the radioactivity in the nucleic acid was measured in counts per minute.The radioactivity of the embryos increases with time probably results from incorporation of radioactive thymine in new DNA during replicationThe graph shows an increase in the radioactive nucleotide, thymine, after fertilization. As the new sea urchin embryos grow, cell division occurs. The radioactive thymine is incorporated into new DNA in the growing embryos.
Therefore, the correct answer is option E.
Animal cells uses thymine primarily for the synthesis of DNA. A
group of sea urchin eggs was fertilized in sea water containing radioactive thymine. Following fertilization, samples of embryos were removed at regular intervals and the radioactivity in the nucleic acid was measured in counts per minute.
The radioactivity of the embryos increases with time probably results from incorporation of radioactive thymine in new DNA during replication
The graph shows an increase in the radioactive nucleotide, thymine, after fertilization. As the new sea urchin embryos grow, cell division occurs. The radioactive thymine is incorporated into new DNA in the growing embryos.
Therefore, the correct answer is option E.
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