To avoid the unfavourable conditions, the zooplanktons enter into :

Which one of the following is NOT the function of Leydig cells ?

Which one of the following statement is incorrect about ecological pyramids?

In agarose gel electrophoresis, the separated DNA fragments can be visualised by staining the DNA with a compound, known as

DNA recombinant technology involves the use of restriction endonucleases. After having cloned the gene of interest and having optimised the conditions to induce the expression of the target protein, one has to consider producing it on a large scale. The cells harbouring cloned genes of interest may be grown on a small scale in the laboratory. In order to link the alien DNA, the vector needs to have very few, preferably single, recognition sites for the commonly used restriction enzymes. Presence of more than one recognition sites within the vector will generate several fragments, which will complicate the gene cloning. In Biolistics or gene gun method cells are bombarded with high velocity micro particles of gold or tungsten coated with DNA. The ligation of alien DNA is carried out at a restriction site present in one of the two antibiotic resistance genes. For example, you can ligate a foreign DNA at the BamH I site of tetracycline resistance gene in the vector pBR322. Since the DNA is enclosed within the membranes, we have to break the cell open to release DNA along with other macromolecules such as RNA, proteins, polysaccharides and also lipids. The RNA can be removed by treatment with ribonuclease whereas proteins can be removed by treatment with protease. Other molecules can be removed by appropriate treatments and purified DNA ultimately precipitates out after the addition of chilled ethanol.
Which one of the following enzymes works as molecular glue?

The historic convention on Biological Diversity held in Rio de Janeiro in 1992 is also called :

The first menstruation which begins at puberty is called :

The electromagnetic radiation used to kill germs in water purifiers is

Which of the following statements are correct?
(A) Inverse of a matrix, if it exists, is unique
(B) \((k A)^{\prime}=-k A^{\prime}\) (where \(k\) is any real number)
(C) For an invertible matrix \(A,\left(A^{-1}\right)^{-1}=A\)
(D) For an invertible matrix \(A,\left(A^{\prime}\right)^{-1}=\left(A^{-1}\right)^{\prime}\)
Choose the correct answer from the options given below :

A ray of light is incident on an equilateral prism at an angle of 45° and is refracted parallel to the base of the prism. The angle of deviation would be

Identify the correct statements for the behavior of ethane-1,2-diamine as a ligand.
(A) it is a neutral ligand
(B) it is a bidentate ligand
(C) it is an ambidentate ligand
(D) it is a chelating ligand
Choose the correct answer from the options given below:

In a Hydrogen atom there is transition of electron from one orbit to another. Choose the correct option given below in which the emitted photon will have the highest frequency?

Which of the given values of x and y make the following pair of matrices equal?
\(\left[\begin{array}{cc}3 x-2 & y-x \\ 20 & -2\end{array}\right]\) and \(\left[\begin{array}{cc}4 & 2 \\ 14 x-8 & y-6\end{array}\right]\)