TLS Online

Previous Year Questions

TLS Online TPP Program

QUESTION ID:1

Catabolite repression in bacteria is regulated by the concentration of

amino acids

glucose

messenger RNA

lactose

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=25626&year=2023&month=February

QUESTION ID:2

Phagocytosis was first described by

Elie Metchnikoff

Robert Hooke

Robert Koch

Paul Ehrlich

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=25628&year=2023&month=February

QUESTION ID:3

Which one of the following statements about batch culture of microbes is NOT correct?

Cells from stationary phase will show longer lag phase when inoculated in fresh growth medium compared to those collected from exponential phase.

Death phase of culture is often exponential in nature.

Stationary phase is the cryptic growth phase.

The rate of generation of new cells during exponential growth phase is constant.

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=25630&year=2023&month=February

QUESTION ID:4

Match the test in Group I with its application in Group II

Group I Group II

P. Oakley-Fulthorpe test 1. IgM detection

Q. Limulus amoebocyte lysate test 2. Determining antigen-antibody specificity

R. Weil-Felix reaction test 3. Endotoxin detection

S. Complement-fixation test 4. Rickettsial infection diagnosis

P-2, Q-3, R-4, S-1

P-2, Q-1, R-4, S-3

P-3, Q-1, R-2, S-4

P-4, Q-3, R-2, S-1

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=25635&year=2023&month=February

QUESTION ID:5

Which one of the following is NOT correct about antibiotic resistance mechanism in microbes?

Mycoplasma is naturally resistant to penicillins due to presence of R plasmid.

Gram-negative bacteria are impermeable to penicillin G.

β-lactamases of bacteria can cleave penicillins.

Selective microbes can efflux penicillins entering the cell and develop resistance.

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=25637&year=2023&month=February

QUESTION ID:6

A suspension of photosynthetic green algae was illuminated in the presence of ¹⁴CO2 for few seconds. The first metabolite in the Calvin cycle to be radiolabeled will be

glyceraldehyde

1,3-bisphosphoglycerate

3-phosphoglycerate

ribulose 1,5-bisphosphate

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=25639&year=2023&month=February

QUESTION ID:7

Determine the correctness or otherwise of the following Assertion [a] and the Reason [r].

Assertion [a]: Endospore can survive heat that would rapidly kill vegetative cells of the same species.

Reason [r]: In endospore, the protoplasm is reduced to minimum volume as a result of the accumulation of calcium-dipicolinic acid complexes and small acid-soluble spore proteins, which forms a cytoplasmic gel and a thick cortex.

Both [a] and [r] are true and [r] is the correct reason for [a]

Both [a] and [r] are true and [r] is not the correct reason for [a]

Both [a] and [r] are false

[a] is true but [r] is false

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=25640&year=2023&month=February

QUESTION ID:8

Which one of the following conjugations will result in formation of merodiploids?

F+ donor × F- recipient

Hfr donor × F- recipient

F' donor × F- recipient

F+ donor × Hfr recipient

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=25641&year=2023&month=February

QUESTION ID:9

Which of the following genus is/are a spirochete(s)?

Borrelia

Leptospira

Spirulina

Treponema

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=25659&year=2023&month=February

QUESTION ID:10

Which of the following is/are non-membrane bound inclusion bodies?

Carboxysomes

Cyanophycin granules

Poly-β-hydroxybutyrate granules

Polyphosphate granules

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=25660&year=2023&month=February

QUESTION ID:11

Which of the following antibiotics is/are isolated from Streptomyces spp.?

Gentamicin

Nystatin

Polymyxins

Tetracyclines

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=25663&year=2023&month=February

QUESTION ID:12

Which of the following statements about the primary and secondary adaptive immune responses to an antigen is/are correct?

IgM antibodies appear first in response to the initial exposure of the antigen

Majority of the antibodies produced in response to the second exposure of the same antigen are IgM isotype.

Second exposure of the same antigen stimulates production of memory cells.

Primary antibody response has shorter lag phase than secondary antibody response.

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=25664&year=2023&month=February

QUESTION ID:13

The spontaneous, and induced mutations in bacteria can be distinguished by

fluctuation test

replica plating

disc diffusion test

use-dilution test

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=25666&year=2023&month=February

QUESTION ID:14

During the exponential growth, it took 6 hours for the population of bacterial cells to increase from 2.5 × 10⁶to 5 × 10⁸. The generation time of the bacterium, rounded off to the nearest integer, is ________ minutes.

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=25667&year=2023&month=February

QUESTION ID:15

Choose the correct group of fat soluble vitamins

Cholecalciferol, a-Tocopherol, Menadione

Thiamine, Cholecalciferol, a-Tocopherol

Niacin, a-Tocopherol, Menadione

Biotin, Thiamin, Niaci

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27607&year=2023&month=February

QUESTION ID:16

The synthesis of thyroxine T4 in human body requires

Selenium

Iodine

Iron

Zinc

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27608&year=2023&month=February

QUESTION ID:17

Which among the followings is NOT an essential amino acid?

L-Phenylalanine

L-Valine

L-Lysine

L-Arginine

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27609&year=2023&month=February

QUESTION ID:18

The time required for stipulated destruction of a microbial population at a given temperature is

D-value

F-value

z-value

Q10 value

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27610&year=2023&month=February

QUESTION ID:19

Which among the following statements is NOT correct?

Cod fish is a major source of 0-3 fatty acids

Beetroot is a good source of B-carotene.

Apple is a good source of vitamin B12.

Fresh sugarcane juice is a good source of polyphenol oxidase.

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27611&year=2023&month=February

QUESTION ID:20

Calculate the efficiency in percent (rounded off to I decimal place) of an oil expeller which yields 37 kg oil containing 5% solid impurities from 100 kg mustard seeds. The oil content of the mustard seed is 38%.

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27612&year=2023&month=February

QUESTION ID:21

Orange juice is packaged aseptically and stored under ambient conditions. The degradation of vitamin C in the juice occurs during storage and it follows first order reaction kinetics. The degradation rate constant is 5.2×103 day¹. The half-life of vitamin C in days is (in integer).

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27613&year=2023&month=February

QUESTION ID:22

The weight of 10 kg dried cauliflower containing 5% moisture (wet basis) after rehydration is 60 kg. If the fresh cauliflower contained 87% moisture (wet basis). calculate the coefficient of rehydration (rounded off to 2 decimal places).

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27614&year=2023&month=February

QUESTION ID:23

Some of the industrial products are produced by fermentation processes. Identify the correct pair of product and fermentative microorganism.

Vinegar - Acetobacter aceti

Citric acid - Enterbacter aerogenes

Ethanol - Saccharomyces cerevisiae

L-Lysine - Aspergillus niger

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27615&year=2023&month=February

QUESTION ID:24

Choose the correct statement(s) about the enzyme and its application in food processing reaction.(MTA)

Chymosin is widely used in cheese manufacturing.

Thermolysin is used in the synthesis of Aspartame.

B-Galactosidase catalyzes the hydrolysis of galactose.

Lipase is used for restructuring of acyl glycerol.

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27616&year=2023&month=February

QUESTION ID:25

Identify the Gram +ve bacteria responsible for causing food borne diseases among the followings

Campylobacter jejuni

Clostridium botulinum

Vibrio cholerae

Salmonella typhi

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27617&year=2023&month=February

QUESTION ID:26

Extrusion cooking is accomplished in four different stages, which are indicated as I, II, III and IV in the figure given below. Choose the correct option representing the name of each stage.

I – Feeding, II – Cooking, III – Kneading, IV – Expansion

I – Kneading, II – Feeding, III – Cooking, IV – Expansion

I – Feeding, II – Kneading, III – Cooking, IV – Expansion

I – Cooking, II – Kneading, III – Feeding, IV – Expansion

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27618&year=2023&month=February

QUESTION ID:27

Match the method value used for measuring lipid characteristics in Column I with the corresponding properties indicated by them, in Column II.

Column I Column II

P. Thiobarbituric acid test 1. Induction time

Q. Rancimat method 2. Degree of unsaturation

R. Peroxide value 3. Carbonyl content

S, Iodine value 4. Hydroperoxide content

P-3, Q-1, R-4, S-2

P-1, Q-3, R-4, S-2

P-3, Q-1, R-2, S-4

P-3, Q-4, R-1, S-2

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27619&year=2023&month=February

QUESTION ID:28

Match the peeling technique in Column I with the vegetable, for which it is used in industry, given in Column II.

Column I Column II

P.Knife peeling 1.Brinjal

Q.Abrasion peeling 2. Tomato

R. Flame peeling 3. Potato

S. Flash peeling 4. Cucumber

P-3, Q-4, R-1, S-2

P-4, Q-1, R-3, S-2

P-4, Q-3, R-2, S-1

P-4, Q-3, R-1, S-2

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27620&year=2023&month=February

QUESTION ID:29

Match the process in Column I with the related food component in Column II.

Column I Column II

P. Caramelization 1.Lipid

Q. Denaturation 2.Sugar

R. Oxidation 3. Pigment

S. Bleaching 4. Enzyme

P-2, Q-4, R-1, S-3

P-2, Q-1, R-4, S-3

P-1, Q-3, R-2, S-4

P-2, Q-1, R-3, S-4

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27621&year=2023&month=February

QUESTION ID:30

Identify the correct statement(s) related to grain polysaccharides among the followings.

Dextrin are a group of low molecular weight polysaccharides produced by dry hydrolysis of starch.

Amylose is a linear polymer of D-glucose units joined by a (1→6) glycoside linkages.

Amylopectin is a branched chain polymer of D-galactose monomer units.

Retrogradation is a process of reassociation of amylose and formation of crystalline structure by gelatinized starch upon cooling.

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27622&year=2023&month=February

QUESTION ID:31

A sample of glucose isomerase enzyme converts 15 umoles of substrate glucose into product fructose min¹ mL under standard assay conditions. The enzyme activity of the glucose isomerase in International Unit (IU) is (in integer)

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27623&year=2023&month=February

QUESTION ID:32

If D10 for Salmonella in egg yolk is 0.75 kGy, calculate the radiation dose in kGy (rounded off to 2 decimal places) required for reducing the Salmonella count in egg yolk by 8 log cycles.

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27624&year=2023&month=February

QUESTION ID:33

The average moisture binding energy of a textured protein product (TPP) at 8% moisture content (dry basis) is 3200 cal.mol'. If the water activity of the TPP at the above moisture content is 0.30 at 30 °C, the water activity of the sample at 45 °C is (rounded off to 2 decimal places). The value of Gas constant R = 1.987 cal.mol'.K'.

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=27625&year=2023&month=February