An alkyl bromide, RBr of molecular weight 151 is the exclusive product of bromination of which hydrocarbon?

1) Dodecane
2) 2,2 - dimethylpropane
3) 2,2 - dimethylhexane
4) 2,2,3 - trimethylheptane

Schizont stage in the life cycle of malarial parasite occurs in
1. Erythrocytes of man
2. Stomach of Anopheles
3. Blood of man
4. Salivary glands of Anopheles

0.2 g of an organic compound gave 0.17 g NH_3? in kjeldhal's method. The percentage weight of nitrogen in the given compound is:

1) 70%
2) 80%
3) 50%
4) 90%

Origin of species was published in the year
 1) 1859
 2) 1862
 3) 1883
 4) 1919

Waste produces of adenine and guanine metabolism are excreted by man as
1. Ammonia
2. Urea
3. Uric acid
4. Allantion

The gymnosperms and angiosperms differ from the rest of the vascular plants in that :
1) they have an independent gametophyte generation
2) they have flagellated sperm
3) they are herterosporous
4) embryo development occurs with in the female gametophyte

Glycoproteins are known to play an important role in cell recognition, the specificity of this recognition is largely provided by

1) Lipid portion of glycoproteins
2) Protein portion of glycoproteins
3) Carbohydrate portion of glycoproteins
4) Both carbohydrate and protein components of glycoproteins

  If r_p = 3 x 10³ ohm and gm = 20 m. mho if triode is used as an amplifier and RL = 6 kohm, then voltage amplification is

(1) 40
(2) 60
(3) 20
(4) 30

Zinc sulphate contains 22.65% of zinc and 43.9% of water of crystallization. If the law of constant proportions is true, then the weight of zinc required to produce 20g of the crystals will be

1) 45.3g
2) 4.53g
3) 0.453g
4) 453g

 The head cap of a sperm is called 
1. centrosome 
2. acrosome 
3. lysosome 
4. none of the these