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Bacteria MCQ Questions & Answers

Bacteria MCQs : This section focuses on the "Bacteria". These Multiple Choice Questions (MCQs) should be practiced to improve the Bacteria skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

Which of the following is/are not a gram-positive bacteria?

A. Streptococci
B. Pseudomonas
C. Mycobacteria
D. None of these

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Question 2

Gram-positive bacteria, responsible for food poisoning, is/are

A. Mycoplasmas
B. Pseudomonas
C. Clostridia
D. All of the above

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Question 3

The gram-positive bacteria lack __________ structure/component?

A. outer membrane
B. murein
C. teichoic acid
D. plasma membrane

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Question 4

Which of the following gram-positive bacteria causes pharyngitis (sore throat)?

A. Neisseria
B. Streptococcus
C. Staphylococcus
D. Mycobacterium

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Question 5

Which of the following gram-negative bacteria is/are not aerobic?

A. Pseudomonas
B. Neisseria
C. Escherichia
D. None of these

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Question 6

The enzyme, which hydrolyses the murein is

A. perxoidase
B. tannase
C. lysozyme
D. None of these

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Question 7

Bacterial spoilage is identified by which of the following morphological characteristics?

A. Encapsulation
B. Endospores
C. Cell aggregation
D. All of the above

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Question 8

Bacteria are

A. saprophytic
B. symbiotic
C. hyper parasitic
D. All of the above

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Question 9

Gram-negative bacteria, responsible for food poisoning, is/are

A. Salmonella
B. Pseudomonas
C. Clostridia
D. None of these

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Question 10

Coliform bacteria on fermentation of carbohydrates yields

A. lactic acid
B. acetic acid
C. formic acid
D. All of the above

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Question 11

Gram-negative bacterium is/are

A. Escherichia
B. Clostridia
C. Staphylococci
D. All of these

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Question 12

Thermus thermopiles is a

A. gram negative eubacteria
B. gram positive eubacteria
C. gram negative archebacteria
D. gram positive archebacteria

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Question 13

Which of the following is a gram-positive bacteria?

A. Lactobacillus
B. Staphylococci
C. Streptococci
D. All of the above

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Question 14

Bacteria are

A. saprophytic
B. symbiotic
C. hyper parasitic
D. all of these

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Question 15

Bacterial spoilage is identified by which of the following morphological characteristics?

A. Encapsulation
B. Endospores
C. Cell aggregation
D. All of these

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Question 16

Coliform bacteria on fermentation of carbohydrates yields

A. lactic acid
B. acetic acid
C. formic acid
D. all of these

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Question 17

Gram-positive bacteria, responsible for food poisoning, is/are

A. Mycoplasmas
B. Pseudomonas
C. Clostridia
D. all of these

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Question 18

Which of the following is a gram-positive bacteria?

A. Lactobacillus
B. Staphylococci
C. Streptococci
D. All of these

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Question 19

An organism containing a gene which doesn’t belong to it and is derived from somewhere else then the organism is said to be ___________

A. transformed
B. transgenic
C. mutant
D. modified

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Question 20

Basically, there are how many methods for introduction of DNA into the bacterial cells?

A. 1
B. 2
C. 3
D. 4

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Question 21

Choose the incorrect statement for shuttle vectors.

A. These are vector hybrids constructed from E.coli and other plasmids
B. They are having a varied use
C. They can replicate and selected in both the species
D. They are the plasmids which are having naturally broad host range

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Question 22

Competence is determined by the excretion into growth medium of _______ & _________ proteins called as competence proteins.

A. cellular & high molecular weight
B. cellular & low molecular weight
C. extracellular & low molecular weight
D. extracellular & high molecular weight

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Question 23

E.coli is a gram negative bacterium.

A. True
B. False

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Question 24

Gram-positive Bacillus, Streptococcus and Streptomyces include species that don’t exhibit natural competence.

A. True
B. False

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Question 25

If a host other than E.coli is to be used, what property of DNA to be inserted is disadvantageous?

A. Circular DNA
B. Linear DNA
C. Replicating DNA
D. Non-replicating DNA

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Question 26

If a plasmid can’t be transferred from one cell to another, then it is called as ___________

A. non-transmissible
B. non-mobilizable
C. untransferrable
D. immobilized

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Question 27

Natural transformation can be relieved by the use of protoplasts, in the presence of osmotic buffer and polyethylene glycol. What are protoplasts?

A. Protoplasts are the cells from which cell membrane has been removed
B. Protoplasts are the cells from which cell wall has been removed
C. Protoplasts are the cells from which vacuole has been removed
D. Protoplasts are the cells from which golgi bodies are removed

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Question 28

The transfer of plasmid from one bacterial cell to another when cargo and conjugal plasmids are used, it is usually is carried out by _____ mating.

A. diparental
B. uniparental
C. triparental
D. multiparental

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Question 29

Transfer of plasmids from one cell to another can also be done conjugation. The plasmid to be transferred known as ______ is often unable to do so by itself and thus it relies on other plasmids known as ______

A. cargo, conjugal
B. conjugal, cargo
C. cargo, helper
D. conjugal, helper

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Question 30

Which of the bacteria are used as hosts?

A. Gram-positive
B. Gram-negative
C. Both gram positive and negative are preferred equally
D. Both can be used but gram positive is preferred

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Question 31

Bacteria which cause diseases in humans, animals and plants are called __________

A. Anaerobic bacteria
B. Aerobic bacteria
C. Pathogenic bacteria
D. Non pathogenic bacteria

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Question 32

Cheese cancer of Swiss and similar cheese is caused by?

A. Oospora Crustacea
B. Oospora caseovorans
C. Oospora aurianticum
D. S. cremoris

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Question 33

Coliform bacteria leads to _________

A. Off-flavor and smell
B. Gas formation
C. Off-flavor, smell and gas formation
D. Fruity taste

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Question 34

Lactic acid bacteria ferment which of the following forming lactic acid?

A. Sucrose
B. Glucose
C. Lactose
D. Fructose

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Question 35

Milk secreted in the udder is virtually sterile.

A. True
B. False

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Question 36

Presence of coliform in milk pipelines after pasteurization indicates __________

A. Excessive hygiene
B. Poor sanitation
C. Rusting
D. Coating

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Question 37

The yoghurt is made from ________

A. Lactobacillus bulgaricus
B. Streptococcus thermophilus
C. S. cremoris
D. Mixed culture of Lactobacillus bulgaricus and Streptococcus thermophilus

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Question 38

What is pigment or color production by bacteria called?

A. Cytogenesis
B. Phytogenesis
C. Chromogenesis
D. Chemogenesis

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Question 39

Which among the following is not a bacterial group which occurs in milk?

A. Lactic acid bacteria
B. Coliform bacteria
C. Putrefaction bacteria
D. Carboxylic acid bacteria

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Question 40

Which bacteria are also known as “The cheese destroyer”?

A. Propionic acid bacteria
B. Coliform
C. Lactic acid bacteria
D. Butyric acid bacteria

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Question 41

Which bacteria is responsible for ripening Emmenthal cheese?

A. Lactobacillus helveticus and Lb. bulgaricus
B. L.acidophilus
C. Bifidobacteria
D. Streptococcus diacetylactis

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Question 42

Which of the following is not a source of infection in milk?

A. Milker and cow
B. Litter
C. Ambient air
D. Heat

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Question 43

Which of the following is the characteristic of good quality milk?

A. CFU<1000000 per ml
B. CFU>1000000 per ml
C. CFU=1000000 per ml
D. CFU>1500000 per ml

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Question 44

Which of the following species of Clostridium is responsible for the formation of dark green to black colors in cheese?

A. Clostridium tyrobutyricum
B. Clostridium sporogenes
C. Clostridium herbarum
D. None of the mentioned

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