Microbiology MCQ 1


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21 Questions MCQ Test Mock Test Series of IIT JAM Biotechnology | Microbiology MCQ 1

Microbiology MCQ 1 for IIT JAM 2022 is part of Mock Test Series of IIT JAM Biotechnology preparation. The Microbiology MCQ 1 questions and answers have been prepared according to the IIT JAM exam syllabus.The Microbiology MCQ 1 MCQs are made for IIT JAM 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Microbiology MCQ 1 below.
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Microbiology MCQ 1 - Question 1

In which phase of bacterial growth, cryptic growth occurs?

Detailed Solution for Microbiology MCQ 1 - Question 1

Cryptic growth means hidden growth of some of individual cells in a starving bacteria in death phase. The majority of cells do not grow at all in death phase but a few cells are able to multiply because these cells use product of lysis of dying cells.

Microbiology MCQ 1 - Question 2

Which amongst the following is an example of monotrichous bacteria?

Detailed Solution for Microbiology MCQ 1 - Question 2

Among given options, S. aureus is non motile and hence does not have flagella, E.coli and S. typhi both have peritrichous arrangement of flagella. Only V. cholera has monotrichous arrangement of flagella.

Microbiology MCQ 1 - Question 3

Malachite green is used to stain

Detailed Solution for Microbiology MCQ 1 - Question 3

Bacterial endospores are stained using schaeffer-fulton procedure with malachite green.

Microbiology MCQ 1 - Question 4

A subunit of virus protein coat is called as

Detailed Solution for Microbiology MCQ 1 - Question 4

The capsomer is a subunit of the capsid , an outer covering of protein that protects the genetic material of a virus. Capsomers self assemble to form the capsid.

Microbiology MCQ 1 - Question 5

Dipicolinic acid is a component of the bacterial

Detailed Solution for Microbiology MCQ 1 - Question 5

The core of the endospore plays an important role in resistance from various unfavorable conditions. Dipicolinic acid combined with calcium ions is present in the core & plays a part in resistance.

Microbiology MCQ 1 - Question 6

If a bacterial culture has a doubling time of 50 minutes then what will be the specific growth rate?

Detailed Solution for Microbiology MCQ 1 - Question 6

As specific growth is equal to ln 2/ Doubling time
Specific growth (µ) = 0.693/50
= 0.0138min–1

Microbiology MCQ 1 - Question 7

A bacteria divides after every 45 minutes. If a culture containing 107 cells per ml is grown for 180 minutes, what will be the cell concentration per ml after 180 minutes?

Detailed Solution for Microbiology MCQ 1 - Question 7

Dividing time is 45 minutes. Total time is 180 minutes
Number of generations after 180 minutes = 180 45 = 4
Now applying the formula
N = N0 x 2n where N = Final number of cells., N0 = Initial number of cells
N = number of generations

Microbiology MCQ 1 - Question 8

Choose the correct statement regarding  facultative anaerobes amongst the following

Detailed Solution for Microbiology MCQ 1 - Question 8

Facultative anaerobes are those that does not require  O2 for their growth but grows better in the presence of  O2.

Microbiology MCQ 1 - Question 9

Whopping cough is caused by

Detailed Solution for Microbiology MCQ 1 - Question 9

Helicobacter pylori causes the peptic ulcer
Haemophilus aegyptius causes eye infection
Campylobacter jejuni causes diarrahea
Bordetella pertusis causes whopping cough

Microbiology MCQ 1 - Question 10

Match the given substance with the correct method of its sterilization

Detailed Solution for Microbiology MCQ 1 - Question 10

Culture media is always autoclaved before using. Serum, being highly heat sensitive is always filtered to remove any microbes. Heat sensitive materials like beer is sterilized by pasteurization. Hormones are cold-sterilized using gamma-radiation. 

Microbiology MCQ 1 - Question 11

The anti bacterial drug chloramphenicol acts on

Detailed Solution for Microbiology MCQ 1 - Question 11

Chloramphenicol binds to 23S rRNA of large ribosomal subunit (50S) to inhibit peptide chain elongation during protein synthesis.

Microbiology MCQ 1 - Question 12

Bird flu is caused by

Detailed Solution for Microbiology MCQ 1 - Question 12

Bird flu is caused by the influenza virus subtype H5N1.

*Multiple options can be correct
Microbiology MCQ 1 - Question 13

Choose the correct statement (s) regarding acid dyes

Detailed Solution for Microbiology MCQ 1 - Question 13

Acidic dyes have negative charge and bind to positively charged cell structures. Its examples includes eosin, rore bengal & acid fuschin.

*Multiple options can be correct
Microbiology MCQ 1 - Question 14

Plasmids are functionally involved in which of the following?

Detailed Solution for Microbiology MCQ 1 - Question 14

The tra genes present in the plasmid are responsible for the formation of sex pili & the transfer of chromosomal genes from F+/Hfr/F’ cells to F- cells. The transfer of a copy of resistance plasmid results in the transfer of drug resistance genes as well. Transduction is mediated by virus and their is no role of plasmid in transduction.

*Multiple options can be correct
Microbiology MCQ 1 - Question 15

Which of the following events does not occur during the stationary phase of bacterial growth ?

Detailed Solution for Microbiology MCQ 1 - Question 15

In stationary phase the cell size does not increase, it remains same and peptidoglycan cross linking also remains the same in stationary phase as the growth rate of cells nearly equal their death rate.

*Multiple options can be correct
Microbiology MCQ 1 - Question 16

The properties of an episome includes.

Detailed Solution for Microbiology MCQ 1 - Question 16

An episome is that type of plasmid that can exist both, as an independent entity as well as after integrating into the host’s chromosome. They contain tra operon, where genes are responsible for the formation of the sex pili & the transfer of gene. Plasmids are necessary for conjugation (which is a type of horizontal gene transfer)

*Multiple options can be correct
Microbiology MCQ 1 - Question 17

Which of the following statements is/are correct for cyanobacteria ?

Detailed Solution for Microbiology MCQ 1 - Question 17

Cyanobacteria, a group of photosynthetic bacteria can grow easily in a medium exposed to light and air. They perform oxygenic photosynthesis. Some of them are nitrogen fixing in anaerobic conditions but can grow in aerobic conditions. 

*Answer can only contain numeric values
Microbiology MCQ 1 - Question 18

A culture of bacteria multiply 10 times in two hours. The generation time (in minutes) is______.


Detailed Solution for Microbiology MCQ 1 - Question 18


*Answer can only contain numeric values
Microbiology MCQ 1 - Question 19

A bacterium belonging to cocci group has a diameter of 1 μm. The numerical value of ratio of its surface area to volume is _______


Detailed Solution for Microbiology MCQ 1 - Question 19

Cocci is sphere shaped structure bacteria

For sphere surface area to volume ratio is 3/a 

a = radius of sphere

As per ques, diameter given as 1 µm so radius is 0.5 

Therefore surface area to volume ratio is 3/a= 3/0.5 = 6

*Answer can only contain numeric values
Microbiology MCQ 1 - Question 20

An experiment is started with 10 number of bacterial cells. After nth generation, the number of cells become 105 cells. The value of n is _________ 


Detailed Solution for Microbiology MCQ 1 - Question 20


*Answer can only contain numeric values
Microbiology MCQ 1 - Question 21

5 mL of a culture was added to 45 mL of distilled water. This suspension was further diluted to two serial, 1/100 dilutions. 0.1 mL of this final mixture was plated onto an agar plate. Suppose, an average of 137 colonies appeared on the plate after incubation. The CFU/mL of the original sample is _______ ×108.


Detailed Solution for Microbiology MCQ 1 - Question 21

Total dilutions = 5mL sample in 45 mL diluent = 1/10 = 10-1
It is next diluted by1/100 factor. Hence. 10-3.
Further dilution of 1/100 leads to 10-5.
Hence, Dilution factor = 10-5
Volume plated = 0.1 mL
No. of colonies = 137
CFU = ?

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