A double stranded DNA fragment has 500 Adenine bases. If total number of base pairs in this fragment is 2500, then what will be the number of guanine bases?

Identify the statements which hold true with respect to origin of life.
(A) Louis Pasteur demonstrated that life comes only from pre-existing life.
(B) Big Bang theory attempts to explain the origin of universe.
(C) Oparin and Haldane proposed first form of life came from pre-existing non-living organic molecules.
(D) Miller's experiment was unable to prove chemical evolution.

The eggs of the cuckoo (koel) have evolved to resemble crow's eggs in size and color. If the parasite bird has laid its eggs in the nest of host and lets the host to incubate them. This is an example of:

Which of the following area is India's one of the biodiversity hot spots ?

Match List-I with List-II

List-I (Techniques)	List-II (Related features)
(A) ELISA	(I) Production of mature insulin
(B) PCR	(II) Antigen-antibody interaction
(C) Autoradiograph	(III) Amplification of DNA
(D) Recombinant DNA technology	(IV) Photographic film

Choose the correct answer from the options given below:

Read the given paragraph and answer the question:
Humans have 23 pairs of chromosomes. 22 pairs are exactly same in both males and females; these are the autosomes. A pair of X-chromosome are present in the female, whereas the presence of an X and Y chromosome are determinant of the male characteristic.
A number of disorders in human beings have been found to be associated with the inheritance of changed or altered genes or chromosomes. Broadly, genetic disorder may be grouped into two categories-Mendelian disorders and Chromosomal disorders.
A haemophilic man marries a normal woman. What is the possibility that their child have haemophilia?

Identify the factor which does not affect the Hardy-Weinberg equilibrium ?

Which of the following disorders are the results of aneuploidy?
(A) Haemophilia
(B) Down's Syndrome
(C) Thalassemia
(D) Turner's Syndrome
Choose the correct answer from the options given below:

The order of reaction with rate law expression \(\frac{d[R]}{dt} = -k\) is:

Among the following, which is the correct set of reducing agents for conversion of nitrobenzene into aniline?
(A) \(H _2 / Pd\)
(B) \(Sn + HCl\)
(C) \(Fe + HCl\)
(D) \(NaBH _4\)
Choose the correct answer from the options given below:

The ratio of maximum frequency and minimum frequency of light emitted in Balmer series of hydrogen spectrum is

A drop of solution (Volume \(0.05\text{ mL}\)) contains \(3.0 \times 10^{6}\) mole of \(\text{H}^{+}\) ions. If the rate constant of disappearance of \(\text{H}^{+}\) is \(1.0 \times 10^{7}\text{ mol litre}^{-1}\text{ sec}^{-1}\), how long will take \(\text{H}^{+}\) ions to disappear?

A boat covers 32 km upstream and 36 km downstream in 7 hours.
Also, it covers 40 km upstream and 48 km downstream in 9 hours.
The speed of the boat in still water is :