Genes that are involved in turning on or off the transcription of a set of structural genes are called:

The logic behind the $NOR$ gate is that it gives

Which one of the following complexes will have four isomers?

If $u=\sin ^{-1}\left(\frac{x^2+y^2}{x+y}\right)$ then $x \frac{\partial u}{\partial x}+y \frac{\partial u}{\partial y}$ is equal to:

Which one of the following gives a yellow precipitate with iodine and $NaOH$ solution?

$A$ student connects a long air-cored coil of manganin wire to a $100\, V$ $D.C.$ supply and records a current of $25\, A$. When the same coil is connected across a $100\, V$,$50\, Hz$ $A.C.$ supply,the current reduces to $20\, A$. The reactance of the coil is ...... $\Omega$.