Which of the following statements is correct in the context of observing $DNA$ separated by agarose gel electrophoresis?
- A$DNA$ can be seen in visible light
- B$DNA$ can be seen without staining in visible light
- CEthidium bromide stained $DNA$ can be seen in visible light
- DEthidium bromide stained $DNA$ can be seen under exposure to $UV$ light
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In a stirred-tank bioreactor,the stirrer facilitates $........$
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$I.$ It represents typical agarose gel electrophoresis showing differential migration of $DNA$ fragments.
$II.$ Lane $1$ contains undigested $DNA$ fragments.
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$II.$ Lane $1$ contains undigested $DNA$ fragments.
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$IV.$ Smallest $DNA$ bands are present at $(A)$ position and largest $DNA$ bands are present at $(B)$ position.
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