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A colorful, educational illustration of various bacteria types under a microscope, with labeled parts and growth media, conveying a sense of scientific exploration.

Bacterial Biology Knowledge Quiz

Test your understanding of essential concepts in bacteriology with our comprehensive quiz. Featuring 62 multiple-choice questions, this quiz covers a wide range of topics related to the structure, function, and classification of bacteria.

Engage your knowledge and learn more about:

Gram-positive and Gram-negative bacteria
Microscopy and staining techniques
Culture methods and diagnostics

62 Questions16 MinutesCreated by StudyingScience42

A process wherein bacteria multiply by elongation of the cell followed by division of the enlarged cell into two cell is?

Culture

Budding

Dehydrogenasse

AOTA

Which of the following method can be used to determine the number of bacteria quantitatively?

Streak-plate

Spread-plate

Pour plate

Pour-plate and spread plate

These are minute highly durable body formed within the cell and capable of developing into a new individual?

Dilution of the mixed culture is a common step in all the three methods: the streak-plate, the spread-plate and the pour-plate technique.

True

False

Resolving power of a microscope is a function of ____________

Wavelength of light used

Numerical aperture of lens system

Refractive index

Wavelength of light used and numerical aperture of lens system

Which of the following are not performed in lyophilization?

Agar slant is covered with mineral oil

Cell suspension is frozen at -60 degree to -78 degree C

Vials are connected to high- vacuum line

Bacterial sample is dehydrated

In Phase contrast microscopy, the rate at which light enters through objects is __________

Constant

Inversely proportional to their refractive indices

Directly proportional to their refractive indices

Exponentially related to their refractive indices

In light microscopy, which of the following is used as fixatives prior to staining technique?

Osmic acid

Glutaraldehyde

Heat

Osmic acid, glutaraldehyde, heat

Which part of the light microscope controls the intensity of light entering the viewing area?

Coarse adjustment screw

Fine adjustment screw

Diaphragm

Condenser lens

What is the approximate size of the bacterial cell?

2mm in diameter

1mm in diameter

2 micrometer in diameter

0.5 to 1.0 micrometer in diameter

Negative Staining is used for examining _____________

Virus particles

Protein molecules

Bacterial flagella

Virus particles, protein molecules and bacterial flagella

In the classification of bacteria according to shape, which among the following refers to cuboidal arrangement of bacterial cells?

Tetrads

Staphylococci

Sarcinae

Streptococci

Which among the following are “Spirochetes”?

Spirillum volutans

Corynebacterium diphtheriae

Streptomyces sp

Treponema pallidum

Surface area/volume ratio of bacteria is exceedingly low compared to the same ratio for larger organisms of similar shape.

True

False

Peptidoglycan is made up of __________

N-acetylglucosamine

N-acetylmuramic acid

N-acetylglucosamine, N- acetylmuramic acid

N-acetylglucosamine, N- acetylmuramic acid, amino acids

Gram-negative bacteria are more resistant to antibiotics due to the presence of?

Thin peptidoglycan wall

Outer lipopolysaccharide layer

Porin proteins

Teichoic acid

The organisms which can use reduced inorganic compounds as electron donors are known as _________

Chemotrophs

Organotrophs

Lithotrophs

Phototrophs

The isolation of gonorrhea-causing organism, Neisseria gonorrhoeae by the use of certain antibiotics in media is an example of which of the following?

Selective media

Differential media

Enriched media

Assay media

Which of the following instrument is used for sterilizing the media after it has been prepared?

Autoclave

Laminar Air Flow Chamber

Inoculum Needle

Incubator

The temperature that allows for most rapid growth during a short period of time is known as __________

Minimum Temperature

Maximum Temperature

Optimum Temperature

Growth Temperature

A slippery outer covering in some bacteria that protects them from phagocytosis by host cells is

Capsule

Cell wall

Flagellum

Peptidoglycan

A shiny, sticky colony of Streptococcus pneumoniae is likely to be

Encapsulated and pathogenic

Nonencapsulated and pathogenic

Nonencapsulated and nonpathogenic

Encapsulated and nonpathogenic

A bacterial cell wall does all of the following except

Gives shape and rigidity to the cell

Is associated with some symptoms of disease

Is the site of action for some antibiotics

Protects the cell from phagocytosis

He fact that viruses are obligate intracellular parasites means that they require a ____________________ for reproduction

Culture dish

Host cell

Phenol red broth

Secondary virus

Most human pathogens prefer temperatures near that of the human body. They are called

Psychrophiles

Thermophiles

Mesophiles

Halophiles

The optimum temperature for an organism is the one at which

It grows with the shortest generation time

It has the longest time between cell divisions

It is near one extreme of its range of tolerated temperatures

Its enzymes begin to denature

If you use a visible light microscope to examine a live culture of a bacterium possessing flagella, you will be able to see the flagella moving the bacteria.

True

False

Organisms that ferment glucose may produce any of the following end products except

Lactic acid

Propionic acid

Alcohol

Oxygen

The following media is/are classified according to three properties?

Under microscopy the capacity of an optical system to distinguish or separate two adjacent points or objects from one another is?

Which of the following is NOT true of microorganisms?

They produce antibiotics

They are used in production of many types of food and beverages.

They decompose dead organisms

They all cause disease in humans.

Microorganisms are found

In and on the bodies of warm blooded mammals

In soil.

Air

Microorganisms are found in all of the above places.

Microbiology is the study of microorganisms which include all of the following except:

Bacteria

Viruses

Plants

Protozoa

Which of the following groups of organisms contains members better known for transmitting agents of disease than for causing illness themselves?

Arthropods

Protozoa

Fungi

Helminths

Protozoa generally have the smallest cells of any of the organisms commonly studied by microbiologists.

Eurt

Eslaf

One of the reasons microorganisms are used in research is that they have most of the same structures found in a human cell.

Totoo

Engk/false

Immunology deals with the biological response of a host to invasion by a foreign object such as a microorganism.

Katotohanan

Kamalian

Type of optical microscope that can be used to view the internal cellular detail of an organisms is?

A. Phase-contrast

B. Flourescent

C. Bright-field

D. AOTA

This/ These following optical microscopes have a maximum magnification of 100x-200x?

A. Bright-field

B. Confocal

C. Dark-field

D. AOTA

The following media is/are classified according to three properties?

Staphylococci will besst describe/s it

A. Gram-positive cocci that form clusters

B. Gram-negative cocci that form clusters

C. Gram-negative bacilli that form in chains

E. NOTA

Coagulase production differentiates S. Aureus from most CONS, except

A. S. lugdunensis

B. S. viridans

C. S. sanguis

F. AOTA

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