What are convection currents? What three processes or forces combine to set convection currents in motion?
What specific layer of the earth do convection currents take place?

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the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation:

answer; both surfaces of the membrane are nonpermeable