Which of the following statements are incorrect?
(A) In bacteria, Bt toxin exists as inactive protoxin
(B) Due to alkaline pH in the gut, the toxin is converted into its active form
(C) The toxin is already present in active form in bacteria
(D) The inactive toxin binds to the surface of midgut and causes cell swelling and lysis.
Choose the correct answer from the options given below :

Cryopreservation technique used for the conservation of threatened animals and plants is:

Tropics have greater biodiversity because:

Read the following paragraph and answer the given questions.
RNAi takes place in all eukaryotic organisms as a method of cellular defense. The source of this complementary RNA could be from an infection by viruses having RNA genomes or mobile genetic elements (transposons) that replicate via an RNA intermediate. Insulin from an animal source, though caused some patients to develop allergy or other types of reactions to the foreign protein. Insulin consists of two short polypeptide chains: chain A and chain B, that are linked together by disulphide bridges. Transgenic mice are being developed for use in testing the safety of vaccines before they are used on humans. Transgenic mice are being used to test the safety of the polio vaccine. If successful and found to be reliable, they could replace the use of monkeys to test the safety of batches of the vaccine. Specific Bt toxin genes were isolated from Bacillusthuringiensis} and incorporated into the several crop plants such as cotton. The choice of genes depends upon the crop and the targeted pest, as most Bt toxins are insect-group specific. The toxin is coded by a gene cryIAc named cry. There are a number of them, for example, the proteins encoded by the genes cryIAc and cryIIAb control the cotton bollworms, that of cryIAb controls corn borer.

The suitable example of mobile genetic elements is:

Identify the correct statements about Amazon rain forest.
(A) They are called lungs of the planet
(B) The fall in tundra region of USA
(C) They have the greatest bio-diversity on earth
(D) They are being cut and cleared for cultivating soyabean
Choose the correct answer from the options given below:

The process of copying genetic information from one strand of DNA into RNA is termed as

Read the given paragraph carefully and answer the following questions:
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. This can be achieved by treating the bacterial cells/plant or animal tissue with enzymes such as lysozyme (bacteria), cellulase (plant cells), chitinase (fungus). There are some basic steps in genetically modifying an organism (i) identification of DNA with desirable genes; (ii) introduction of the identified DNA into the host; (iii) maintenance of introduced DNA in the host and transfer of the DNA to its progeny. Agrobacterium tumifaciens, a pathogen of several dicot plants is able to deliver a piece of DNA known as 'T-DNA' to transform normal plant cells into a tumor and direct these tumor cells to produce the chemicals required by the pathogen. Other molecules can be removed by appropriate treatments and purified DNA ultimately precipitates out after the addition of chilled ethanol. Selection of recombinants due to inactivation of antibiotics is a cumbersome procedure because it requires simultaneous plating on two plates having different antibiotics. Therefore, alternative selectable markers have been developed which differentiate recombinants from non-recombinants on the basis of their ability to produce colour in the presence of a chromogenic substrate. In this, a recombinant DNA is inserted within the coding sequence of an enzyme, ß-galactosidase. This results into inactivation of the gene for synthesis of this enzyme, which is referred to as insertional inactivation.
Which one gives blue colored colonies if the plasmid in the bacteria does not have an insert?

Arrange the following spermatogenic cells in correct sequence of spermatogenesis.
(A) Spermatids
(B) Spermatogonium
(C) Secondary Spermatocytes
(D) Primary Spermatocytes
Choose the correct answer from the options given below:

If the forward voltage in a p-n junction diode is increased, the width of the depletion region :

The correct increasing order of reactivity of alkyl halides with \(CH _3 NH _2\) is
(A) \(C _2 H _5- Br\)
(B) \(C _2 H _5- I\)
(C) \(C _2 H _5- F\)
(D) \(C _2 H _5- Cl\)
Choose the correct answer from the options given below:

A parallel plate air capacitor has a capacity C, distance of separation between its plates is x and potential difference applied across the plates is V. What is the force of attraction between the plates of the parallel plate air capacitor?

The cell reaction occurring at anode in the electrolysis of aqueous \(\text{NaCl}\) solution is :

The amount to which ₹ 5000 will accumulate at the effective rate of 4% for 4 years and 5% for 2 years is: