NEET 2017 Biology question

What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis?

(1)The larger the fragment size, the farther it moves
(2)The smaller the fragment size, the farther it movesCorrect
(3)Positively charged fragments move to farther end
(4)Negatively charged fragments do not move

Answer: (2)

Solution

DNA is negatively charged, so in an electric field all fragments move towards the anode (positive electrode). The agarose gel acts as a sieve; smaller fragments pass through the pores more easily and therefore move farther, while larger fragments move more

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-092108