Chapter 14, Problem 6STP

Summary Introduction

Introduction:

Gel electrophoresis is a technique used to separate the DNA fragments according to the size of the fragments. The fragments are loaded on the negatively charged end of a gel. When electric current is applied, the DNA fragments move to positive end of the gel. The smaller fragments move farther and faster than the larger ones.

Answer to Problem 6STP

Correct answer :

The correct answer is option A. charge on the fragments

Explanation of Solution

Explanation/justification for the correct answer:

Option A. charge on the fragments − After the restriction enzymes make cuts in the DNA and form fragments, gel electrophoresis is done to separate the fragments of DNA. The charge of the fragments causes the DNA fragments to move towards the positive end of the gel. Hence this is the correct option.

Explanation for incorrect answer:

Option B. DNA extraction of chemicals− The charge of the fragments causes the DNA fragments to move towards the positive end of the gel. Hence this is not the correct option.

Option C. gel medium components- The charge of the fragments causes the DNA fragments to move towards the positive end of the gel. Hence this is not the correct option.

Option D. source of the DNA− The charge of the fragments causes the DNA fragments to move towards the positive end of the gel. Hence this is not the correct option.