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Previous Year Questions

TLS Online TPP Program

QUESTION ID:1

Base-pair substitutions caused by the chemical mutagen ethyl methane sulfonate are a result of

QUESTION ID:2

The classical way of representing taxonomic hierarchy of living organisms in ASCENDINGORDER is 

QUESTION ID:3

Of the following, the most effective method to kill bacterial endospores is 

QUESTION ID:4

The class of enzymes, which catalyze addition of groups to double bonds and non-hydrolytic removal of chemical groups, is

QUESTION ID:5

Anammox organisms carry out (A) 

QUESTION ID:6

Which combination of the following statements about specialized transduction is TRUE? 
(P) Specialized transducing phages can transport only certain genes between bacteria
(Q) Specialized transducing phages can transport any gene between bacteria
(R) Phage P22 is a specialized transducing phage
(S) Phage lambda is a specialized transducing phage 

QUESTION ID:7

Which combination of profiles in the following figure accurately represents the transport rate of glycerol and oxygen into E. coil cells as a function of their extracellular concentration? 


QUESTION ID:8

Which one of the following about the standard free energy change (AG') and the equilibrium constant (Keg) of an exergonic reaction. at pH 7.0, is TRUE? 

QUESTION ID:9

An oil immersion objective of a light microscope has a numerical aperture of 1.25. Using the Abbe equation, the maximum theoretical resolving power (in nm) of the microscope with this objective and blue light (wavelength =450 nm) is  

QUESTION ID:10

The working volume (in liter) of a chemostat with 0.1 h-1 dilution rate and 100 ml/h feed flow rate is 

QUESTION ID:11

If the decimal reduction time for spores of a certain bacterium at 121°C is 12 seconds, the time required (in minutes) to reduce 1010 spores to one spore by heating at 121°C is  

QUESTION ID:12

The doubling time (in minutes) of a bacterium with a specific growth rate of 23 h4 in 500 ml of growth medium is

QUESTION ID:13

A bacterial culture is grown using 2M mg/ml fructose as the sole source of carbon and energy. The bacterial biomass concentrations immediately after inoculation and at the end of the growth phase are 0.1 mg/ml and O9 mg/ml, respectively. Assuming complete utilization of the substrate, the bacterial growth yield (Y) on fructose is  

QUESTION ID:14

The volume (in ml) of a 1M mg/ml stock solution of ampicillin to be added to 0.1 liter of growth medium for achieving a final ampicillin concentration of 50 µg/ml is 

QUESTION ID:15

An E. coli strain is grown initially on glucose as the sole carbon source. Upon complete consumption of glucose following 12 h of growth, lactose is added as the sole carbon source and the strain is further grown for 12 h. Assuming that the E. coli strain has a functional wild type lac operon, which one of the following profiles is the most ACCURATE representation of beta - galactosidase (beta -gal) expression (in arbitrary units)? 

QUESTION ID:16

The term "paedomorphosis" refers to 

QUESTION ID:17

Which one of the following statements is TRUE when determining the age of a fossil using carbon dating? 

QUESTION ID:18

Constitutive enzymes are 

QUESTION ID:19

Which one of the following is a function of intermediate filaments? 

QUESTION ID:20

Which one of the following statements is FALSE with respect to phospholipids? 

QUESTION ID:21

Which one of the following organs is INCORRECTLY paired with its function?

QUESTION ID:22

Where do B lymphocytes acquire immune competence? 

QUESTION ID:23

Which one of the following life cycle stages of Plasmodium falciparum is infectious?

QUESTION ID:24

What is the role of the notochord during organogenesis in a vertebrate embryo? 

QUESTION ID:25

The behavior of young ducks following their mother is known as 

QUESTION ID:26

Match the species names with class names

QUESTION ID:27

A population of spotted deer found in a national forest is in Hardy-Weinberg equilibrium. For a particular genetic locus in this deer species, only two alleles A and a are possible. If the frequency of the A allele in this population is 0.6, and the frequency of the a allele is 0.4, what will be the frequency of the genotype Aa?

QUESTION ID:28

In Drosophila, the gene for eye colour is present on the X chromosome. When a red-eyed female was mated with a white-eyed male, a total of 100 progeny were obtained — 50 females and 50 males. Of the 50 females, 25 were red-eyed, and 25 were white-eyed. How many of the male progeny were red-eyed? 

QUESTION ID:29

Defect in poly-A tail formation in eukaryotic mRNA leads to

QUESTION ID:30

Assuming equal frequency for all 4 nucleotides (G, A, T, C), how many EcoRI recognition sites (GAATTC) are possible in a bacterial artificial chromosome of 100,000 base pairs?

QUESTION ID:31

Choose the correct option that shows pairing of the organelle to its function 

QUESTION ID:32

Choose the correct option based on your understanding of the circulatory system 

QUESTION ID:33

The popular birth control pills for women have a combination of synthetic forms of estradiol and progesterone. Which one of the following statements is INCORRECT with regard to their function as contraceptive?

QUESTION ID:34

Which one of the following is consistent with the germplasm theory of August Weismann? 

QUESTION ID:35

Which one of the following statements DOES NOT explain altruism? 

QUESTION ID:36

Standard pasteurization protocol for milk is adequate for destroying

QUESTION ID:37

Which one of the following is NOT a component of an evaporator? 

QUESTION ID:38

Among the following animal foods, the fat content is least in 

QUESTION ID:39

The enzyme that hydrolyzes starch to maltose is

QUESTION ID:40

Which one of the following is NOT enriched in endosperm during parboiling of paddy? 

QUESTION ID:41

Heat-treated legume seed proteins are more digestible than those of untreated legume seed proteins due to 

QUESTION ID:42

What is the percent relative humidity at which both the dry bulb and wet bulb thermometers would record equal temperatures?

QUESTION ID:43

How many fold would the g-number of a centrifuge increase by doubling both the spinning speed and bowl diameter?

QUESTION ID:44

Prolonged fermentation of cocoa seeds lead to "off-taste" due to the release of 

QUESTION ID:45

The gradual decrease in viscosity of tomato paste during storage can be prevented by quickly heating it to 82 °C, because 

QUESTION ID:46

Match the enzyme in Group I with its corresponding application in Group II 

QUESTION ID:47

Milk is flowing at 0.12 m3/min in a 2.5 cm diameter pipe. The temperature of the milk is 21 °C and the corresponding viscosity and density are 2.1 x 10-3 Pas and 1029 kg/m3, respectively. if the flow is found to be turbulent under the given conditions, the Reynolds number is 

QUESTION ID:48

Whole milk (34,950 kg) containing 4% fat is to be separated in 6 h period into skim milk with 0.45% fat and cream with 45% fat. The flow rate of cream stream (kg/h) from the separator is 

QUESTION ID:49

Match the edible plant tissue in Group I with the type of carotenoid given in Group II 

QUESTION ID:50

Green tea is considered to be a more healthy option than black tea because it

QUESTION ID:51

A dilute pineapple juice is heated in a double pipe heat exchanger from 28 °C to 75 °C by heat exchanging with hot water flowing in shell in counter current direction_ Hot water is entering the shell at 95 °C and leaving at 85 °C. The log mean temperature difference (°C) is  

QUESTION ID:52

Granulated sugar, having an average particle size of 500 pm, is milled to produce icing sugar having an average particle size of 25 pm The power requirement was 10 kW as obtained by Rittingefs law. If the same mill were to be used to produce fondant sugar having an average particle size of 20 pm at the same capacity, the power requirement (kW) would be 

QUESTION ID:53

One ton of soybean containing 18% oil, 35% protein, 27.1% carbohydrates, 9.4% of fibre and ash, and 10.5% moisture is crushed and pressed. The residual oil content in the pressed cake is 6%. Assuming that there is no loss of protein and water with oil, the amount of oil (kg) obtained from the crusher is 

QUESTION ID:54

Match the processing method in Group I with the operation carried out in Group II 

QUESTION ID:55

The order of succession of microbes in the spoilage of milk, involving
(P) Lactobacillus,
(Q) protein digesting bacteria,
(R) Lactococcus lactis,
(5) yeasts and molds, is