Read the following statements regarding molecular diagnosis techniques: (A) Conventional methods of diagnosis like serum and urine analysis allow the early detection of diseases. (B) ELISA is based on the principle of antigen-antibody interaction. (C) A single-stranded DNA or RNA, tagged with a radioactive molecule, is called a probe. (D) During autoradiography, a clone of cells having a mutated gene appears brightly

Step-by-step solution

Statement (A) is incorrect because early detection of diseases is not possible using conventional methods of diagnosis like serum and urine analysis. Techniques like PCR and ELISA serve this purpose. Statement (B) is correct as ELISA relies on antigen-antibody interactions to detect infections. Statement (C) is correct according to the definition of a probe in molecular biology. Statement (D) is incorrect because the clone having a mutated gene does not appear on the photographic film. The radioactive probe lacks c