Feulgen reaction is used to test: (A) mRNA, (B) tRNA, (C) DNA, (D) SnRNA
Answer is C. DNA should be stained red. The background, if counterstained, is green. The Feulgen reaction is a semi-quantitative technique. If the only aldehydes remaining in the cell are those produced from the hydrolysis of DNA, then the technique is quantitative for DNA.