TLS Online

Previous Year Questions

Performance Meter

TLS Online TPP Program

QUESTION ID:1

Which one of the following mutagens convert DNA’s adenine to hypoxanthine?

Ultraviolet light

Mitomycin C

Methyl methanesulfonate

Nitrous acid

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17746&year=2022&month=February

QUESTION ID:2

Which one of the following leukocytes are present in the largest proportion in healthy human blood?

Neutrophils

Eosinophils

Basophiles

Monocytes

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17747&year=2022&month=February

QUESTION ID:3

The site of photosynthesis in cyanobacteria is ____________.

Chloroplast

Chromatophores

Thylakoids

Chlorosomes

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17748&year=2022&month=February

QUESTION ID:4

The antimicrobial activity of vancomycin is due to the ____________.

inhibition of nucleic acid synthesis

damage to the cytoplasmic membrane

inhibition of cell wall synthesis

regulation of DNA supercoiling

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17749&year=2022&month=February

QUESTION ID:5

Phenolics act as disinfectant by ____________

rupturing plasma membrane followed by leakage of cellular contents

bond formation between adjacent pyrimidine bases

forming adduct with amino acid and unsaturated fatty acids

alkylation of proteins

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17750&year=2022&month=February

QUESTION ID:6

Which of the following methods are used for the identification of microorganisms?

Nucleic acid hybridization

Southern blotting

16s rRNA sequencing

Percentage G-C content

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17751&year=2022&month=February

QUESTION ID:7

Which of the following are present in Gram-negative bacteria?

Lipopolysaccharide

Teichoic acid

Periplasm

Endotoxin

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17752&year=2022&month=February

QUESTION ID:8

Nonsense suppressor mutation is found in _________________.

rRNA

tRNA

start codon of mRNA

stop codon of mRNA

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17753&year=2022&month=February

QUESTION ID:9

Choose the correct match for structural components of bacteria to their function.

Structural component	Function
(P) Flagella	(i) prevent cell lysis
(Q) Cell wall	(ii) chemotaxis
(R) Metachromatic granules	(iii) storage for ATP
(S) Magnetosomes	(iv) cell orientation

(P)-(ii), (Q)-(iii), (R)-(i), (S)-(iv)

(P)-(ii), (Q)-(i), (R)-(iii), (S)-(iv)

(P)-(ii), (Q)-(i), (R)-(iv), (S)-(iii)

(P)-(i), (Q)-(iv), (R)-(iii), (S)-(ii)

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17754&year=2022&month=February

QUESTION ID:10

Match the pathogen with the appropriate disease.

Pathogen	Disease
(P) Streptococcus pyogenes	(i) Scarlet fever
(Q) Brucella species	(ii) Pott’s disease
(R) Mycobacterium tuberculosis	(iii) Traveler’s diarrhea
(S) Escherichia coli	(iv) Undulant fever

(P)-(ii), (Q)-(iii), (R)-(i), (S)-(iv)

(P)-(ii), (Q)-(i), (R)-(iii), (S)-(iv)

(P)-(i), (Q)-(iv), (R)-(ii), (S)-(iii)

(P)-(i), (Q)-(iv), (R)-(iii), (S)-(ii)

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17755&year=2022&month=February

QUESTION ID:11

Match the correct mode of cell division with respective bacteria.

Bacteria

(P) Streptomyces species

(Q) Rhodopseudomonas acidophila

(R) Bacillus subtilis

(S) Nocardia species

(P)-(ii), (Q)-(iii), (R)-(i), (S)-(iv)

(P)-(ii), (Q)-(i), (R)-(iii), (S)-(iv)

(P)-(iv), (Q)-(ii), (R)-(i), (S)-(iii)

(P)-(i), (Q)-(iv), (R)-(iii), (S)-(ii)

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17756&year=2022&month=February

QUESTION ID:12

The correct sequence of overall biochemical reaction which expresses the process of denitrification is ____

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17757&year=2022&month=February

QUESTION ID:13

Which of the following diseases are caused by family of DNA viruses?

Hepatitis B

Smallpox

Influenza

Rabies

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17758&year=2022&month=February

QUESTION ID:14

Which of the following Gram-positive cocci are found in biofilm of dental plaque?

Gonococcus

Streptococcus mutans

Streptococcus sobrinus

Fusobacterium species

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17759&year=2022&month=February

QUESTION ID:15

Which of the following statements are TRUE for archaea?

Cell wall in archaea contains muramic acid and D-amino acid

N-Formylmethionine is the first amino acid to initiate new polypeptide chain synthesis in archaea

Methionine is the first amino acid used during protein synthesis in archaea

Membrane of archaea contains phytanyl rather than fatty acids

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17760&year=2022&month=February

QUESTION ID:16

If the plasmid given below is digested with restriction enzymes HindIII and EcoRI, considering complete digestion, how many DNA fragments will be released?

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17761&year=2022&month=February

QUESTION ID:17

Escherichia coli growing under favorable conditions doubles in every 20 minutes. If the initial number of Escherichia coli cells is 100, what will be the logarithmic number of cells at 17^th generation? (Answer up to 1 decimal place)

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17762&year=2022&month=February

QUESTION ID:18

What will be value of the Numerical Aperture (NA), if half aperture angle is 58° and oil immersed objective is used for the process of light microscopy? (Answer up to 1 decimal place) Consider Sin 58° = 0.85 and refractive index of immersion oil used is = 1.50.

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17763&year=2022&month=February

QUESTION ID:19

Which one of the following organic compounds is composed of only (i) a nitrogen containing base, (ii) a single five-carbon sugar, and (iii) a triphosphate?

Nucleoside

Nucleotide

Base

Nucleic acid

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17764&year=2022&month=February

QUESTION ID:20

Which one of the following animals develops adaptive predator avoidance morphology because of the presence of high predator number in its habitat?

Daphnia sp.

Scaphiopus sp.

Wolbachia sp.

Rhodnius sp.

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17765&year=2022&month=February

QUESTION ID:21

To which class of Drosophila developmental genes does fushi tarazu (ftz) belong?

Gap genes

Segment polarity genes

Pair rule genes

Maternal effect genes

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17766&year=2022&month=February

QUESTION ID:22

The action of which class of enzyme inhibitors can be reversed by adding an excess of substrate?

Uncompetitive inhibitors

Competitive inhibitors

Non-specific inhibitors

Allosteric inhibitors

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17767&year=2022&month=February

QUESTION ID:23

Mendel deduced the genetic principle of inheritance by experimenting on sweet pea plants. One of the experiments involved crossing plants with two contrasting characters, tall (dominant) and dwarf (recessive), which yielded all tall plants in the first generation. When the same genetic cross was independently repeated by a researcher, only short plants were obtained. Which one of the following can possibly explain the altered outcome?

Tall plants were heterozygous

An enhancer for the tall allele is present in the dwarf plant

A suppressor for the tall allele is present in the dwarf plant

Dwarf plants are homozygous

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17768&year=2022&month=February

QUESTION ID:24

Which of the following is/are responsible for reversible receptor-ligand interaction?

Ionic interactions

Hydrogen bonding

Peptide bonding

Hydrophobic interactions

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17769&year=2022&month=February

QUESTION ID:25

In the human body, which of the following is/are involved in processing of a foreign antigen?

B-cells

Macrophages

Red blood cells

Platelets

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17770&year=2022&month=February

QUESTION ID:26

Animals can be classified as ‘specialists’ or ‘generalists’ with respect to diet andhabitat selection. Which of the following organism/s belong/s to the specialist category?

Raccoon

Panda

Polar Bear

Koala Bear

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17771&year=2022&month=February

QUESTION ID:27

Match the drug/chemicals listed in Column I with the developmental/physiological defects listed in Column II.

Column I	Column II
P. Veratrum alkaloids	(i) Obesity
Q. Thalidomide	(ii) Minamata syndrome
R. Methylmercury	(iii) Cyclopia
S. Diethylstilbestrol	(iv) Phocomelia

P-(iii); Q-(iv); R-(ii); S-(i)

P-(i); Q-(iv), R-(iii), S-(ii)

P-(ii), Q-(iv), R-(iii), S-(i)

P-(ii), Q-(iii), R-(iv), S-(i)

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17772&year=2022&month=February

QUESTION ID:28

Match the animals listed in Column I with primary tissue or organ of residence in the host listed in Column II

Column I	Column II
P. Ascaris lumbricoides	(i) Subcutaneous tissue in human
Q. Dracunculus medinensis	(ii) Lymphatic vessels and lymph nodes
R. Enterobius vermicularis	(iii) Small intestine
S. Wuchereria bancrofti	(iv) Caecum or vermiform appendix

P-(iii), Q-(iv), R-(ii), S-(i)

P-(i), Q-(iv), R-(iii), S-(ii)

P-(ii), Q-(iii), R-(iv), S-(i)

P-(iii), Q-(i), R-(iv), S-(ii)

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17773&year=2022&month=February

QUESTION ID:29

Match the cell types listed in Column I with their sources in Column II and the primary functional roles listed in Column III.

Column I	Column II	Column III
P. Microglial cells	(i) Lung	a. Visual transduction
Q. Leydig cells	(ii) Eyes	b. Hormone secretion
R. ON cells	(iii) Brain	c. Phagocytosis
S. Pneumocytes	(iv) Testis	d. Gaseous exchange

P-(iii)-b, Q-(iv)-c, R-(ii)-a, S-(i)-d

P-(ii)-c, Q-(iv)-d, R-(i)-a, S-(iii)-b

P-(i)-a, Q-(iv)-b, R-(ii)-c, S-(iii)-d

P-(iii)-c, Q-(iv)-b, R-(ii)-a, S-(i)-d

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17774&year=2022&month=February

QUESTION ID:30

Match the ecological concepts listed in Column I with their definitions listed in Column II.

Column I	Column II
P. Dominance hierarchies	(iv) Preferential access to the food and mates in a group
Q. Territory	(iii) Exclusion of competing individuals using agonistic behavior
R. Altruism	(i) Giving up one’s own reproductive potential to benefit another individual
S. Kin selection	(ii) Selection acting on related animals which affects fitness of an individual

P-(ii), Q-(iv), R-(i), S-(iii)

P-(iv), Q-(iii), R-(i), S-(ii)

P-(iii), Q-(iv), R-(i), S-(ii)

P-(i), Q-(iv), R-(iii), S-(ii)

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17775&year=2022&month=February

QUESTION ID:31

Match the hormones listed in Column I with their primary source tissues in Column II and the primary target tissues listed in Column III

Column I	Column II	Column III
P. Epinephrine	(i) Hypothalamus	a. Pituitary
Q. Prolactin	(ii) Thyroid	b. Heart
R. Calcitonin	(iii) Pituitary	c. Bone
S. Thyrotropin releasing hormone	(iv) Chromaffin tissue	d. Pigeon’s crop

P-(iii)-b, Q-(iv)-c, R-(ii)-a, S-(i)-d

P-(iv)-c, Q-(iii)-b, R-(ii)-a, S-(i)-d

P-(iv)-b, Q-(iii)-d, R-(ii)-c, S-(i)-a

P-(iii)-b, Q-(iv)-c, R-(ii)-d, S-(i)-a

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17776&year=2022&month=February

QUESTION ID:32

2-Deoxyglucose (2-DG) inhibits the proliferation of cells and hence finds use as an anti-cancer agent. It is also used in COVID therapy, where it blocks hyperproliferation of virus-infected cells. Mechanistically, 2-DG blocks glycolysis by inhibiting the activities of which of the following enzyme/s?

Hexokinase

Glucose 6-phosphate isomerase

Glucose-6 phosphate dehydrogenase

Phosphofructokinase

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17777&year=2022&month=February

QUESTION ID:33

According to Abbe’s equation on microscopy, the ability to resolve two entities inside a cell by light microscopy depends on which of the following factor/s?

Magnification of the objective lens

Intensity of incident light

Wavelength

Numerical aperture of the objective lens

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17778&year=2022&month=February

QUESTION ID:34

Match the animal inactivity behaviors listed in Column I with representative animals in Column II and their definitions listed in Column III.

	Column I		Column II		Column III
P.	Torpor	(i)	Australian burrowing frogs	a.	Prolonged period of inactivity without reducing body temperature
Q.	Hibernation	(ii)	Polar Bears	b.	Inactivity period which accompanies extended periods of dryness
R.	Winter sleep	(iii)	Ground Squirrels	c.	Decreased metabolism with lowered body temperature occurring in daily activity cycles
S.	Aestivation	(iv)	Hummingbirds	d.	Decreased metabolism and lower body temperature for weeks or months

P-(ii)-c, Q-(iv)-b, R-(i)-a, S-(iii)-d

P-(iv)-c, Q-(iii)-d, R-(ii)-a, S-(i)-b

P-(iv)-c, Q-(ii)-b, R-(i)-a, S-(iii)-d

P-(iv)-b, Q-(i)-c, R-(ii)-d, S-(iii)-a

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17779&year=2022&month=February

QUESTION ID:35

If the vital capacity (VC) of an individual is 4900 ml, the tidal volume (TV) is 500 ml, and the inspiratory reserve volume (IRV) is 3300 ml, the expiratory reserve volume (ERV) of the individual is ________ml. (in integer).

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17780&year=2022&month=February

QUESTION ID:36

A typical food chain involves producers, herbivores, primary carnivores and secondary carnivores. Based on Lindeman’s law of trophic efficiency, if producers have 40 kJ of energy, the energy that will be stored in secondary carnivores is _____ kJ. (round off to two decimal places)

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17781&year=2022&month=February

QUESTION ID:37

The average body length of Drosophila nasuta collected from Andaman and Nicobar Islands is 2 mm. From this population, a few males and females having a body length of 3 mm were selected and interbred. The average body length of the resultant progeny was 2.5 mm. The heritability (h²) of the body length in this population is ______. (round off to one decimal place)

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17782&year=2022&month=February

QUESTION ID:38

Which among the given options truly depict the lines 1 and 2 in the figure below with respect to the effect of heat processing on food?

1-Safety, 2-Quality

1-Yield, 2-Safety

1-Yield, 2-Quality

1-Quality, 2-Safety

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17783&year=2022&month=February

QUESTION ID:39

Homogenization of milk leads to disintegration of fat globules by

Turbulence and pasteurization

Pasteurization and cavitation

Pasteurization and pressurization

Turbulence and cavitation

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17784&year=2022&month=February

QUESTION ID:40

The lowest water activity (aw) supporting the growth of Staphylococcus aureus in food under aerobic condition is

0.98

0.91

0.89

0.86

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17785&year=2022&month=February

QUESTION ID:41

Cultures used in industrial production of yogurt are

Lactococcus lactis subsp. lactis

Streptococcus thermophilus

Leuconostoc mesenteroides subsp. cremoris

Lactobacillus delbrueckii subsp. bulgaricus

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17786&year=2022&month=February

QUESTION ID:42

In a dairy plant, spray drying technology is used to produce whey powder. The rate of spray drying depends on

Temperature of the incoming air

Shape of the cyclone separator

Diameter of the whey droplet

Heat transfer coefficient of hot air

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17787&year=2022&month=February

QUESTION ID:43

The parboiling of paddy results into

Increase in the milling losses

Increase in the nutritional value of rice

Increase in the head rice recovery

Increase in the broken rice percentage

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17788&year=2022&month=February

QUESTION ID:44

One hundred kg paddy is dried from 18% wet basis to 13% wet basis moisture content. The amount of water removed (in kg) from the paddy is _______ (round off to one decimal place).

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17789&year=2022&month=February

QUESTION ID:45

In a canning industry, the total process time (F0) was calculated as 3 min. If each can contains 20 spores having decimal reduction time of 1.6 min, the probability of

spoilage would be ______ in 100 cans (round off to the nearest integer).

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17790&year=2022&month=February

QUESTION ID:46

Match the edible oil refining stages given in Column I with their respective functions in Column II

Column I	Column II
P. Degumming	1. Separation of waxes
Q. Neutralization	2. Removal of pigments
R. Bleaching	3. Removal of phosphatides
S. Winterization	4. Removal of free fatty acids

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

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

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

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

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17791&year=2022&month=February

QUESTION ID:47

Make the correct pair of food packaging technology given in Column I with operating principle or description in Column II.

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

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

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

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

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17792&year=2022&month=February

QUESTION ID:48

Which of the following is not a caramel flavour producing compound?

3-Hydroxy-2-methylpyran-4-one

2H-4-Hydroxy-5-methylfuran-3-one

3-Hydroxy-2-acetylfuran

p-Amino benzoicacid

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17793&year=2022&month=February

QUESTION ID:49

Match the size reduction equipment in Column I with the method of operation in Column II.

Column I	Column II
P. Hammer mill	1. Compression
Q. Burr mill	2. Impact
R. Crushing rolls	3. Cutting
S. Rotary knife	4. Attrition

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

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

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

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

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17794&year=2022&month=February

QUESTION ID:50

Most commonly used refrigerant in direct immersion freezing of food is

Monochlorodifluoromethane

Dichlorodifluoromethane

Liquid nitrogen

Freon

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17795&year=2022&month=February

QUESTION ID:51

Which among the following are

poly unsaturated essential fatty acids?

18:2 Linoleic acid

18:3 Alpha -Linolenic acid

18:3 beta -Linolenic acid

20:4 Arachidonic acid

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17796&year=2022&month=February

QUESTION ID:52

Which among the following statements are true with respect to protein denaturation?

There may be an increase in Alpha-helix and beta-sheet structure

It is an irreversible process

When fully denatured, globular proteins resemble a random coil

The peptide bonds are broken

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17797&year=2022&month=February

QUESTION ID:53

Identify the correct pair(s) of milling equipment and the grain for which it is used.

Mist polisher–Rice

Break roll–Wheat

Rubber roll–Pigeon pea

Beall degermer–Maize

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17798&year=2022&month=February

QUESTION ID:54

Which among the following expression(s) is/are correct?

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17799&year=2022&month=February

QUESTION ID:55

In a dairy processing plant, milk enters a 30 m long and 2 cm diameter tube at 60 ⁰C and leaves at 57⁰C. The total heat loss over the tube length is 381.15 W. The

specific heat capacity, density, and viscosity of milk are 3.85 kJ kg^-1 K^-1, 1020 kg m^-3, and 1.20 cP, respectively. The Reynolds number for the flow is ______ (round off to the nearest integer).

Given: π = 3.14

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17800&year=2022&month=February

QUESTION ID:56

The dry bulb temperature and relative humidity of air inside a storage chamber are 37 ⁰C and 50%, respectively. The saturation pressure of water vapour at 37 ⁰C and

barometric pressure are 6.28 kPa and 101.32 kPa, respectively. The humidity ratio of air inside the chamber is ______ kg water (kg dry air)^-1 (round off to three decimal places).

Given: Molecular weight of water vapour and dry air are 18.02 g mol^-1 and 28.97 g mol^-1, respectively.

https://triyambak.org/courses/gate-life-sciences/tpp/pyq?qid=17801&year=2022&month=February