MCQ
Purines possess nitrogen at which position?
- A$1, 2, 4$ and $6$ position
- B$1, 3, 5$ and $7$ position
- ✓$1, 3, 7$ and $9$ position
- D$1, 2, 6$ and $8$ position

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$I.$ Cancer can be detected by the use of antibodies against cancer specific antigens for certain type of cancer
$II.$ The tumor cells are surgically removed to reduce the load of cancerous cells
$III.$ Certain chemotherapeutic drugs are used to kill the cancerous cells, but majority of the drugs have side effects like hair loss, anaemia, etc.