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Previous Year Questions

TLS Online TPP Program

QUESTION ID:1

Which one of the following conditions favors maximum expression of lac operon genes in E. coli? 

QUESTION ID:2

Match the cellular organelle in Group 1 with its function in Group II 

QUESTION ID:3

 A 250 microl of bacteriophage stock containing 8x108phages/ml is added to 500111 of E. coli culture containing 4x108 cells/ml . The multiplicity of infection is  

QUESTION ID:4

Digestion of an immunoglobulin G (lgG) molecule with pepsin will NOT 

QUESTION ID:5

Match the process involved in nitrogen or sulfur cycle in Group I with the corresponding microbe in Group II 

QUESTION ID:6

Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]. 
Assertion [a]: Diphtheria exotoxin is an example of A-B type toxin. 
Reason [r]: The A component of the toxin is released from the hot cell while the B component inhibits protein synthesis and kills the host cell. 

QUESTION ID:7

Which one of the following statements about control of microbial growth is NOT correct? 

QUESTION ID:8

An example of a differential and selective medium in which colonies of Gram-negative bacteria produce large amounts of acidic products and appear green with a  metallic sheen is

QUESTION ID:9

Which one of the following is an example of substrate level phosphorylation?

QUESTION ID:10

A bacterial culture containing 3 x 105 live cells was exposed to a newly developed sterilizing agent. After 30 minutes of exposure, 3 live cells remained in culture. The decimal reduction time (in minutes) for the new agent is  

QUESTION ID:11

A  bacterial culture has a generation time of 34 minutes. The time taken (in minutes, rounded off to two decimal places) for the OD550 of this exponentially growing culture to increase from 0.25 to 0.85 is 
Assume that OD550 has a linear relationship with the cell density. 

QUESTION ID:12

A 100 microl aliquot (104 dilution) of the bacterial culture plated on the nutrient agar gave 4 colonies. The bacterial stock concentration (in million cells/ml, rounded off to one decimal place) is  

QUESTION ID:13

continuous bacterial culture carried out in a chemostat is set to a flow rate of 40 ml/hr. The culture volume is equivalent to that of a cubical container having 10 cm sides. The dilution rate (in hr-1, rounded off to two decimal places) of this system is  

QUESTION ID:14

Which ONE of following leucocytes is phagocytic and has clear cytoplasm?

QUESTION ID:15

Which ONE of the following techniques can be used for detecting the subcellular
localization of serotonin receptor in intact cells? 

QUESTION ID:16

Which ONE of the following is NOT a site for in situ conservation? 

QUESTION ID:17

Which ONE of the following is the precursor molecule for corticosteroids?

QUESTION ID:18

Transitional epithelia is found in which ONE of the following organs? 

QUESTION ID:19

Visual signal transduction cascade is activated by rhodopsin and involves degradation rather than synthesis of which ONE of the following second messenger molecules?

QUESTION ID:20

The genomes of both human and Drosophila code for an amylase that acts on the same substrate. However, the sequence of nucleotides in the genes encoding the two is dissimilar. This is an example of which ONE of the following types of evolution?

QUESTION ID:21

"Round dance" is performed by forager bees to indicate the distance between a food source and their colony. Which ONE of the following best represents this distance?

QUESTION ID:22

Which ONE of the following phyla have choanocytes? 

QUESTION ID:23

Which ONE of the following glial cells is NOT derived from the ectoderm? 

QUESTION ID:24

Tarantulas and mosquitoes both belong to the phylum Arthropoda. Which ONE of the following represents the correct number of legs in them respectively? 

QUESTION ID:25

Match the following subcellular organelles in Column I with associated functions in Column II 


QUESTION ID:26

Match the following genetic disorders in Column I with associated typical chromosomal changes mentioned in Column II

QUESTION ID:27

Match the following components listed in Column I with their respective organs in Column II


QUESTION ID:28

Match the following digestive enzymes in Column I with their respective functions in Column II. 

QUESTION ID:29

Which ONE of the following graphs represents the relationship between ventricular end-diastolic volume and cardiac output in a healthy adult individual at rest (solid line) and upon exercise (dotted line)? 

QUESTION ID:30

Match the household insect vectors in Column I with their associated diseases in  Column II. 

QUESTION ID:31

Match the proteins in Column I with the organs in which they are maximally expressed in Column II. 

QUESTION ID:32

The graph below shows the activity of enzyme pepsin in the presence of inhibitors aliphatic alcohols (P) or N-acetyl-l-phenylalanine (Q). Which ONE of the following represents the nature of inhibition by P and Q, respectively? 

QUESTION ID:33

In Drosophila, the red eye phenotype (W) is dominant over the recessive white eye mutant (w). In a mixed population of red and white eye flies of 10,000 individuals, 3,600 flies were white eyed. The percentage of the heterozygous red eye flies in this population is  

QUESTION ID:34

The enzyme majorly involved in postmortem degradation of muscle proteins is

QUESTION ID:35

Which of the following is the correct pair of essential fatty acids? 

QUESTION ID:36

Nisin A is produced by

QUESTION ID:37

Which of the following bacteria will stain purple color after Gram staining? 

QUESTION ID:38

The enzyme system used for removal of glucose from egg white prior to its drying consists of 

QUESTION ID:39

The INCORRECT pair of food borne illness and its causative microorganism is

QUESTION ID:40

Which of the following is commonly used as a preservative in the tomato sauce? 

QUESTION ID:41

 A fluid with flow behaviour index less than one (n < I) is 

QUESTION ID:42

The velocity of 2.2 gm diameter fat particles inside a centrifuge, running at 6000 rpm and 20 °C, is 0.25 mm s-1. The velocity of 1.5 .tm diameter fat particles inside the same centrifuge running at 7500 rpm and same temperature (round off to 2 decimal places) will be mm s-1

QUESTION ID:43

The initial population of a bacterial strain increases from 1x104 cells per mL to 1x106 cells per mL in 120 minutes. The generation time for this strain (round off to 2 decimal places) is minutes. 

QUESTION ID:44

Match the protein in Column I with its food source in Column II.

QUESTION ID:45

Match the carbohydrate in Column I with corresponding enzyme used for its hydrolysis in Column II. 

QUESTION ID:46

Match the edible oil refining stage in Column I with its purpose in Column II. 

QUESTION ID:47

Match the food material in Column I with its related term in Column II

QUESTION ID:48

Match the component/system in Column 1 with the peeling method for fruits and vegetables in Column II. 
   

QUESTION ID:49

Which among the given options correctly explains the nature of the microbial culture represented by lines 1, 2 and 3 in the following figure? 

QUESTION ID:50

Match the equation/law in Column I with its application in Column II


QUESTION ID:51

Match the absorber used in modified atmosphere packaging and storage in Column I with the scavenger in Column II 

QUESTION ID:52

During extrusion cooking, food materials are generally subjected to a combination of 

QUESTION ID:53

An orange juice flowing at 0.80 kg s' enters a counter current double pipe heat exchanger at 20 °C and leaves at 72 °C. Inlet and outlet temperatures of the hot water used as heating medium in the exchanger are 81 °C and 74 °C, respectively. The specific heat of the orange juice is 3.74 kJ kg-1 K-1and overall heat transfer coefficient is 492 W m 2 10. The heat transfer surface area (round off to 2 decimal places) will be m2.