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(A) In agarose gel electrophoresis,$DNA$ fragments separate according to their size through the agarose matrix.Smaller $DNA$ fragments move faster and

Vedclass · Accepted Answer

$I, II$ and $III$

Vedclass · Answer

(A) In agarose gel electrophoresis,$DNA$ fragments separate according to their size through the agarose matrix.Smaller $DNA$ fragments move faster and travel further away from the wells,while larger $DNA$ fragments move slower and remain closer to the wells.Looking at the figure:$I.$ The figure represents agarose gel electrophoresis,which is correct.$II.$ Lane $1$ shows a single band near the well,indicating undigested $DNA$,which is correct.$III.$ Lanes $2$ to $4$ show multiple bands,indicating digested $DNA$ fragments,which is correct.$IV.$ Position $(A)$ is closer to the wells,meaning it contains larger $DNA$ fragments,while position $(B)$ is further from the wells,meaning it contains smaller $DNA$ fragments. Thus,statement $IV$ is incorrect.Therefore,statements $I, II,$ and $III$ are correct.

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