Which sugar is found in $RNA$?

$I.$ $DNA$ being a hydrophilic molecule cannot pass through cell membranes.
$II.$ The bacteria should be made competent to accept the $DNA$ molecule.
The correct option regarding the above statements is:

What is common among silverfish,scorpion,crab,and honeybee?

$A$ charged particle moves through a magnetic field in a direction perpendicular to it. Then the

Which of the following is a redox reaction?

If the standard deviation of the numbers $-1, 0, 1, k$ is $\sqrt{5}$ where $k > 0,$ then $k$ is equal to