Previous Year Questions

QUESTION ID:2

Match the following associations involved in dinitrogen fixation with their representative genera Associations Genera

QUESTION ID:3

 A- Cyanobacterial biomass, B - Biological Oxygen Demand, C -Green algal biomass, D - Dissolved Oxygen concentrationThe parameters A, B, C, D are

QUESTION ID:4

The birth rates (b) and death rates (d) of two - species 1 and 2 in relation to population density (N) are shown in the graph. Which of the following is NOT true about the density dependent effects on birth rates and death rates?

QUESTION ID:5

For two species A and B in competition, the carrying capacities and competition coefficients areKA = 150 KB = 200α= 1 β = 1.3According to the Lotka-Volterra model of interspecific competition, the outcome of competition will be

QUESTION ID:6

Consider an autosomal locus with two alleles A1 and A2 at frequencies of 0.6 and 0.4 respectively. Each generation, A1 mutates to A2 at a rate of μ = 1 x 10-5 while A2 mutates to A1 at a rate of υ = 2 x 10-5. Assume that the population is infinitely large and no other evolutionary force is acting. . The equilibrium frequency of allele A1 is

QUESTION ID:7

With reference to the graph given below, identity the optimal territory size.

QUESTION ID:8

A particular behavioural variant affects fitness of an organism. The relationship between the frequency of the variant in the population and fitness are plotted below. In which of these cases is the behavioural variant most likely to reach a frequency of 1?

QUESTION ID:9

The coefficient of relatedness between individuals A and B, A and D, and between D and C is

QUESTION ID:10

One hundred independent populations of Drosophila are established with 10 individuals in each population, of which, one individual is of Aa genotype and the other nine are of AA genotype. If random genetic drift is the only mechanism acting on these populations, then, after a large number of generations, the expected number of populations fixed for the "a" allele is

QUESTION ID:11

Performance of biosensor is evaluated by their response to the presence of an analyte. The physiological relevant concentration of analyte is between 10μM and 50μM. Which among the following biosensor responses is best?

QUESTION ID:12

Molecular polymorphic markers are already known with respect to tobacco mosaic virus (TMV) resistance in tobacco. Among these, which marker system you will select that will be simple, economic and less time consuming:

QUESTION ID:13

In an effort to produce gene knockout mice, a gene targeted homologous recombination was tried, with the exogenous. DNA containing neor gene (confer G-4l8 resistance) and tkHsv gene (confers sensitivity to the cytotoxic nucleotide analog ganciclovir). If the neor gene was inserted within the target gene in the exogenous DNA and considering that both homologous and non-homologous recombination (random integration) is taking place, which one of the following statements is NOT correct about the possible outcome of the experiment?

QUESTION ID:14

In a typical gene cloning experiment, by mistake a researcher introduced the DNA of interest within ampicillin resistant gene instead of lac Z gene. The competent cells were allowed to take up the plasmid and then plated in the media containing ampicillin, X-gal and IPTG and subjected to blue-white screening. Considering all plasmids were recombinant which one of the following statements correctly describes the outcome of the experiment?

QUESTION ID:15

In a typical gene cloning experiment, by mistake a researcher introduced the DNA of interest within ampicillin resistant gene instead of lac Z gene. The competent cells were allowed to take up the plasmid and then plated in the media containing ampicillin, X-gal and IPTG and subjected to blue-white screening. Considering all plasmids were recombinant which one of the following statements correctly describes the outcome of the experiment?

QUESTION ID:16

The sequence of the peptide KGLITRTGLIKR can be unequivocally determined by

QUESTION ID:17

From statements on protein structure and interactions detailed below, indicate the correct statement

QUESTION ID:18

Radioimmuno assay (RIA) can be employed for the detection of insulin in blood plasma. For this, 125I labelled insulin is mixed and allowed to bind with a known concentration of anti-insulin antibody. A known volume of patients' blood plasma is then added to the conjugate and allowed to compete with the antigen binding sites of antibody. The bound antigen is then separated from unbound ones and the radioactivity of free antigen is then measured by gamma counter. Following are some of the statements made about this assay.

(i) The ratio of radioactive count for unbound antigen to the bound one is more at the end of reaction.

(ii) The ratio of radioactive count for unbound antigen to the bound one is less at the end of reaction.

(iii) For a diabetic patient, the radioactive count for free antigen is less than that for a normal individual.

(iv) For a diabetic patient, the radioactive count for free antigen is more than that for a normal individual.

Which of the above statements are true?

QUESTION ID:19

It is hypothesized that the mean (μ0) dry weight of a female in a Drosophila population is 4.5 mg. In a sample of 16 female with ̅ = 4.8 mg and s = 0.8 mg, what dry weight values would lead to rejection of the null hypothesis at p = 0.05 level? (take t0.05=2.1)

QUESTION ID:20

A researcher wants to obtain complete chemical information, i.e., head groups and fatty acids of phospholipids from liver tissues. Phospholipids have fatty acids of different lengths and unsaturation and also the head groups are of different chemistries. Which of the following combination of techniques would provide complete chemical description of phospholipids?