Which of following statements are true about DNA structure?
A. DNA is made of two polynucleotide chains
B. The two chains have anti-parallel polarity
C. The two chains are coiled in a left-handed fashion
D. Distance between a base pairs in a helix is approximately equal to 3.4 nanometre
Choose the correct answer from the options given below:

Human insulin was prepared by:

Which one of the following diseases is non-infectious?

Which one of the following is not the sacred groves?

The backbone of a polynucleotide chain is formed by:

Read the passage carefully to answer the questions given below
Some strains of `Bacillus thuringiensis` produce proteins that kill certain insects such as lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes). In `Bacillus thuringiensis` the toxin is coded by a gene `crylAc` named cry. There are a number of them, for example, the proteins encoded by the genes `crylAc` and `cryllAb` control the cotton bollworms, that of `crylAb` controls corn borer. Using conventional methods of diagnosis (serum and urine analysis, etc.) early detection is not possible. Recombinant DNA technology, Polymerase Chain Reaction (PCR) and Enzyme Linked Immuno-sorbent Assay (ELISA) are some of the techniques that serve the purpose of early diagnosis. The first clinical gene therapy was given in 1990 to a 4-year old girl with adenosine deaminase (ADA) deficiency. This enzyme is crucial for the immune system to function. The disorder is caused due to the deletion of the gene for adenosine deaminase. `RNAi` takes place in all eukaryotic organisms as a method of cellular defense. This method involves silencing of a specific mRNA due to a complementary `dsRNA` molecule that binds to and prevents translation of the `mRNA`.
Some strains of `Bacillus thuringiensis` produce proteins that do not kill ceratin organisms -

Which one of the following is also called 'Terror of Bengal'?

Match List-I with List-II

List - I	List - II
(A) E is independent of r	(I) For a point charge
(B) \(E \propto \frac{1}{r}\)	(II) For a short dipole
(C) \(E \propto \frac{1}{r^2}\)	(III) For a linear charge distribution
(D) \(E \propto \frac{1}{r^3}\)	(IV) For a surface charge distribution on an infinite plane sheet

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A body of mass 20 g and charge \( +50 \text{ }\mu\text{C} \) is suspended from the ceiling by a string. A horizontal electric field of 10 kV/m is applied.
The angle between the string and the vertical direction is :

A parallel combination of three resistors takes a current of 7.5 A from a 30 V battery.
If the resistances of two resistors are \( 12 \text{ } \Omega \) and \( 10 \text{ } \Omega \), then the resistance of the third resistor is:

\(ZnS , AgCl , AgBr\) and \(A g I\) show which of the following defect:

The Convention on Biological Diversity held in Rio de Janeiro in 1992 is popularly known as

Match the Enzyme in List - I with its Activity in List - II.

List - I	List - II
(A) Taq DNA Polymerase	(I) Cleaves the DNA at ends
(B) Exonuclease	(II) Breaks the fungal cell wall
(C) Protease	(III) Stable above 90°C
(D) Chitinase	(IV) Break the protein molecules

Choose the correct answer from the options given below :