The genetic disorder caused due to presence of an additional copy of the chromosome number 21 is:

Read the passage carefully and give the answers to the question :
Does the number of species in a community really matter to the functioning of the ecosystem? This is a question for which ecologists have not been able to give a definitive answer. For many decades, ecologists believed that communities with more species, generally, tend to be more stable than those with less species.
According to the International Union for Conservation of Nature and Natural Resources (IUCN) (2004), the total number of plant and animal species described so far is more than 1.5 million.
In 'rivet popper hypothesis' the 'rivet' signifies :

Read the following passage carefully and answer the given questions
The separated DNA fragments can be visualized only after staining the DNA with ethidium bromide followed by exposure to UV radiation. Bright orange colored bands of DNA in ethidium bromide stained gel exposed to UV light can be seen. The separated bands of DNA are cut out from the agarose gel and extracted from the gel piece. This step is known as elution. The DNA fragments purified in this way are used in constructing recombinant DNA by joining them with a cloning vector.
Which one of the following techniques is used to separate DNA fragments?

The two closely linked genes HBA1 and HBA2 are associated with

Arrange the following steps of replication of retrovirus in correct sequence
A. Incorporation of viral DNA into host genome.
B. Formation of viral DNA by reverse transcription.
C. Infection of normal cell by virus and introduction of viral RNA into host
D. Production of new viral RNA by infected cells.
Choose the correct answer from the options given below:

Identify the role of deoxyribonucleoside triphosphates in DNA replication.
A. Initiate replication.
B. Act as substrate.
C. Provide energy for polymerisation.
D. Activate ligases.
Choose the correct answer from the options given below:

The pollination which involves the transfer of pollen grain from the anther
to the stigma of another flower of the same plant is known as-

Which of the following compounds will show highest acidic strength?

What kind of behavior is shown in the Zwitter ionic form of amino acids?

Answer the question on basis of passage given below :
Chloroform is a very useful solvent for oils, fats and waxes and many organic compounds. It can also be used for preserving biological specimens. Chloroform was used as a general anaesthetic in surgery for a long time but because of its toxic nature, it is no longer used these days.
Chloroform is useful for us because :

Four materials \(\mathrm{A}, \mathrm{B}, \mathrm{C}\) and D have the magnetic susceptibilities \(\chi_{m A}, \chi_{m B}, \chi_{m C}\) and \(\chi_{m D}\) respectively. which are related as \(\chi_{m D}<\chi_{m C}<\chi_{m B}<\chi_{m A}\). Which material can be magnetised with maximum ease?

Match List I with List II

List - I	List - II
(A) \(\int x^2 e^{x^3} d x\)	(I) \(\frac{1}{2 a} \log \left|\frac{a+x}{a-x}\right|+C\)
(B) \(\int e^x\left(\tan ^{-1} x+\frac{1}{1+x^2}\right) d x\)	(II) \(\frac{1}{a} \tan ^{-1}\left(\frac{x}{a}\right)+C\)
(C) \(\int \frac{d x}{a^2-x^2}\)	(III) \(\frac{1}{3} e^{x^3}+C\)
(D) \(\int \frac{d x}{x^2+a^2}\)	(IV) \(e^x \tan ^{-1} x+C\)

A parallel plate capacitor made of circular plates each of radius 10.0 cm has a capacitance 200 pF . The capacitor is connected to a 200 V ac supply with an angular frequency of \(200 rad / s\). The amplitude of the current is :