Which method is used to introduce $r-DNA$ directly into the nucleus of an animal cell?

In a stirred-tank bioreactor,the stirrer facilitates $........$

Refer to the following statements for agarose-gel electrophoresis:
$(a)$ The $\text{DNA}$ fragments resolve according to their size.
$(b)$ The separated $\text{DNA}$ fragment can be visualised only after staining with ethidium bromide followed by exposure to $UV$ radiation.
$(c)$ $\text{DNA}$ is always loaded into the well.
$(d)$ The smallest fragment of $\text{DNA}$ is near the well.
Choose the correct statements:

Which of the following techniques is most commonly used to separate $DNA$ molecules by size?

You have identified a useful gene in bacteria. Make a flow chart of the steps that you would follow to transfer this gene to a plant.

Match List $I$ with List $II$:

List $I$	List $II$
a) Visualization of $DNA$ in gel electrophoresis	i) Chitinase
b) Precipitation of $DNA$	ii) Lysozyme
c) Breaking of cell wall of bacteria	iii) Chilled ethanol
d) Breaking of cell wall of fungus	iv) Ethidium bromide

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