Among P₂O₅, As₂O₃, Sb₂O₃ and Bi₂O₃, the most acidic oxide is

(a) P₂O₅

(b) As₂O₃

(c) Sb₂O₃

(d) Bi₂O₃

In biotechnology applications, a selectable marker is incorporated in a plasmid 

(A)  to increase its copy number

(B)  to increase the transformation efficiency

(C)  to eliminate the non-transformants

(D)  to increase the expression of the gene of interest 

Albinism in humans is controlled by a recessive allele. How many copies of this allele will be found at one of the poles of a cell at telophase-I of meiosis in an albino person? 

(a) 23 

(b) 4 

(c) 2 

(d) 1

Which among grass, goat, tiger and vulture in a food chain, will have the maximum concentration of harmful chemicals in its body due to contamination of pesticides in the soil?

(a) Grass since it grows in the contaminated soil

(b) Goat since it eats the grass

(c) Tiger since it feeds on the goat which feeds on the grass

(d) Vulture since it eats the tiger, which in turn eats the goat, which eats the grass

Three uniformly watered plants i, ii and iii were kept in 45% relative humidity, 45% relative humidity with blowing wind and 95% relative humidity, respectively. Arrange, these plants in the order (fastest to slowest) in which they will dry up.

(a) i → ii → iii

(b) ii → i → iii

(c) iii → ii → i

(d) iii → i → ii

Given the solubility curves of KNO₃ and KCl, which of the following statements is not true?

(A) At room temperature the solubility of KNO₃ and KCI are not equal.

(B) The solubilities of both KNO₃ and KCI increase with temperature.

(C) The solubility of KCI decreases with temperature.

(D) The solubility of KNO₃ increases much more as compared to that of KCl with increase in temperature.

Removal of the pancreas impairs the breakdown of

(a) lipids and carbohydrates only

(b) lipids and proteins only

(c) lipids, proteins and carbohydrates

(d) proteins and carbohydrates only

Which of the following is not true about the total lunar eclipse?

(a) A lunar eclipse can occur on a new moon and full moon day

(b) The lunar eclipse would occur roughly every month, if the orbits of earth and moon were perfectly coplanar

(c) The moon appears red during the eclipse because the blue light is absorbed in earth’s atmosphere and red is transmitted

(d) A lunar eclipse can occur only on a full moon day

Which of the following is the correct order of size of the given species? 

(a) I > I^– > I⁺  

(b) I⁺ > I^– > I

(c) I > I⁺ > I^–

(d) I^– > I > I⁺

Optical activity of DNA is due to its

(a) bases

(b) sugars

(c) phosphates

(d) hydrogen bonds