Carcinogens and Oncogenes — Prelims Strategy

Prelims Strategy

To effectively tackle NEET questions on Carcinogens and Oncogenes, a multi-pronged strategy is recommended. Firstly, memorize key examples: create a comprehensive list of physical, chemical, and biological carcinogens along with the specific cancers they are associated with (e.

g., HPV-cervical cancer, Aflatoxins-liver cancer, Tobacco smoke-lung cancer). Secondly, understand the mechanisms of action: for carcinogens, know whether they cause DNA damage (e.g., UV radiation forming pyrimidine dimers, ionizing radiation causing strand breaks) or promote chronic inflammation.

For oncogenes, thoroughly understand the four main activation mechanisms: point mutation (e.g., *RAS*), gene amplification (e.g., *HER2*), chromosomal translocation (e.g., *BCR-ABL*), and viral insertion.

Pay close attention to specific examples for each mechanism. Thirdly, distinguish between related concepts: clearly differentiate between proto-oncogenes, oncogenes, and tumor suppressor genes, understanding their normal functions and how their alteration contributes to cancer.

Practice identifying trap options that confuse these roles. For numerical problems (though rare here), ensure you understand any quantitative aspects of exposure or risk if presented. Finally, practice MCQs extensively to reinforce recall and identify areas of confusion.

Focus on questions that require matching carcinogens to cancers or mechanisms to oncogene activation.