Which of the following statements are correct ?
1. PCR is now routinely used to detect HIV in suspected AIDS patients.
2. A single - stranded DNA or RNA , tagged with a radioactive molecule (probe) is allowed to hybridize to its complementary DNA in a clone of cells followed by detection using autoradiography.
3. ElISA is based on the principle of antigen - antibody interaction.
4. Today transgenic models exist for many human diseases such as cancer , cystic fibrosis , rheumatoid arthritis, and Alzheimer's

Options

A. 1 and 3
B. 2 and 4
C. 1,3 and 4
D. 1,2,3 and 4

Answer

D