QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
Does DNA move toward red or black? Why is this?
A. DNA moves toward red because red is positively charged.
B. DNA moves toward black because black is negatively charged.
C. DNA moves toward the positive electrode (red) due to its negative charge.
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Answer
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Step 1I'll solve this problem step by step, focusing on the electrophoresis principles of DNA movement.
Step 2: Understand DNA's Molecular Charge
- Each phosphate group ($$PO_{4}^{3-}$$) contributes multiple negative charges to the DNA molecule
- DNA molecules have a consistent negative charge due to their phosphate backbone
Final Answer
DNA moves toward the positive electrode (red) due to its negative charge. The key concept is that the negatively charged DNA molecules are attracted to the positively charged (red) electrode during electrophoresis.
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