Q. Which one of the following statement is not true regarding gel electrophoresis technique?
A) Bright orange coloured bands of DNA can be observed in the gel when exposed to UV light.
B) The process of extraction of separated DNA strands from gel is called elution.
C) The separated DNA fragments are stained by using ethidium bromide.
D) The presence of chromogenic substrate gives blue coloured DNA bands on the gel
Explanation
[Solution] DNA bands stained with ethidium bromide appear orange under UV light; chromogenic substrates are used for blue-white selection of recombinants, not for visualising DNA bands. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.