Which of the following statement is true regarding migration of bio molecules?

Q. Which of the following statement is true regarding migration of bio molecules?

1. the rate of migration is directly proportional to the current
2. the rate of migration is inversely proportional to current
3. the rate of migration is directly proportional to the resistance of the medium
4. Low voltage is used for the separation of high molecular weight compounds

Answer: the rate of migration is directly proportional to current