1
Microbiology Midterm Exam 2026
Questions and Answers (100% Correct
Answers) Already Graded A+
Define Micro- Ans: Less than 1mm and cannot see with the
naked eye
Need a microscope to see
© 2026 Assignment
Microbes, microorganisms, germs, bugs
Guru01 - Stuvia
What are the 5 groups of microorganisms studied? Ans:
Expert
Bacteria--most famous
Virus--2nd
Fungus--3rd
Protozoa--some but few
Algae--not a human pathogen
What generates 1/2 of the O2 that we breathe and would make
life impossible without? Ans: Microbes
What is the smallest simplest single-celled organism? Ans:
Bacteria
What is not a cell, can't live by itself and needs to invade a
cell? Ans: Virus
, 2
What are the two different classification of fungus? Ans: Molds
and yeast--micro
Mushrooms--Macro
What is a mostly single-celled organism that is Animal like?
Ans: Protozoa
What are parasites? Ans: Different organisms that range from
worms, insects and protozoa that need a host to survive
© 2026 Assignment
What are the different applied microbiology fields of study
Ans: Immunology
Guru01 - Stuvia
Expert
Epidemiology--control spread of disease
Food Micro--relationship between bacteria, food and drink
Agriculture Micro--relationship between bacteria and crop
Industrial Micro--microbes to produce vitamins, AA, Enzymes,
etc.
Eukaryotic cells are... Ans: more complete
Prokaryotic cells are... Ans: all micro organisms and lack a
nucleus
Characteristics of microorganisms Ans: Small size
Unicellular simplicity
High Growth rate
, 3
Adaptability
microscope Ans: instrument used for enlargement of small
objects
simple microscope Ans: single lens and a few working parts.
not strong
compound microscope Ans: 2 magnifying lenses, a visible
light sours, a condenser which collects light to direct toward
© 2026 Assignment
the object
magnification Ans: capacity of an optical system to enlarge
Guru01 - Stuvia
small objects
Expert
ocular lens Ans: one we look through. 10X
objective lens Ans: 4 different, 4X, 10X, 40X, 100X
What is resoltion? Ans: Capacity of optical systems to
distinguish or separate 2 adjacent objects/points from each
other. represents clarity of image
Types of microscope? Ans: Light--visible light, bright field,
dark field, phase contrast, diff interference
Ultraviolet--florescence
Electron--scanning, transmission
what type of microscope do we use in the lab? Ans: bright field
light microscope
, 4
how does a microscope work? Ans: light source is on the
bottom. The light travels from the lamp, hits the condenser
lents which collects light and points it toward the object. the
light passes through the objective lens and the real image of
the object forms behind the ocular lens. the image we see is
the virtual image after it asses through the ocular lens and is
at the total magnification
Highest magnification for all light microscopes? Ans: 2,000X
and 200 nm resolution
© 2026 Assignment
eubacteria Ans: the common bacteria of the 2 types. (-) WITH
cell walls, (+) WITH cell walls, and no cell wall (mycoplasm)
Guru01 - Stuvia
Expert
archebacteria Ans: less common type of bacteria. do not
produce peptidoglycan and can live in extreme environments
appendages Ans: attached to bacteria on one side, the other
side is "free"
motility appendages Ans: flagella and axial filaments
flagella Ans: for motility and self propulsion. found mostly in
gram negative bacteria. provide a smooth forward movement
structure of flagella Ans: made of protein with 3 distinct parts:
filament, hook, basal body (inside and has 4 rings and a rod
that rotate)
axial filament Ans: wrap around the cell and cause spiral like
movements. has only two parts: a long thin microfibril
inserted into a hook.
attachment appendages Ans: fimbriae and pili
Microbiology Midterm Exam 2026
Questions and Answers (100% Correct
Answers) Already Graded A+
Define Micro- Ans: Less than 1mm and cannot see with the
naked eye
Need a microscope to see
© 2026 Assignment
Microbes, microorganisms, germs, bugs
Guru01 - Stuvia
What are the 5 groups of microorganisms studied? Ans:
Expert
Bacteria--most famous
Virus--2nd
Fungus--3rd
Protozoa--some but few
Algae--not a human pathogen
What generates 1/2 of the O2 that we breathe and would make
life impossible without? Ans: Microbes
What is the smallest simplest single-celled organism? Ans:
Bacteria
What is not a cell, can't live by itself and needs to invade a
cell? Ans: Virus
, 2
What are the two different classification of fungus? Ans: Molds
and yeast--micro
Mushrooms--Macro
What is a mostly single-celled organism that is Animal like?
Ans: Protozoa
What are parasites? Ans: Different organisms that range from
worms, insects and protozoa that need a host to survive
© 2026 Assignment
What are the different applied microbiology fields of study
Ans: Immunology
Guru01 - Stuvia
Expert
Epidemiology--control spread of disease
Food Micro--relationship between bacteria, food and drink
Agriculture Micro--relationship between bacteria and crop
Industrial Micro--microbes to produce vitamins, AA, Enzymes,
etc.
Eukaryotic cells are... Ans: more complete
Prokaryotic cells are... Ans: all micro organisms and lack a
nucleus
Characteristics of microorganisms Ans: Small size
Unicellular simplicity
High Growth rate
, 3
Adaptability
microscope Ans: instrument used for enlargement of small
objects
simple microscope Ans: single lens and a few working parts.
not strong
compound microscope Ans: 2 magnifying lenses, a visible
light sours, a condenser which collects light to direct toward
© 2026 Assignment
the object
magnification Ans: capacity of an optical system to enlarge
Guru01 - Stuvia
small objects
Expert
ocular lens Ans: one we look through. 10X
objective lens Ans: 4 different, 4X, 10X, 40X, 100X
What is resoltion? Ans: Capacity of optical systems to
distinguish or separate 2 adjacent objects/points from each
other. represents clarity of image
Types of microscope? Ans: Light--visible light, bright field,
dark field, phase contrast, diff interference
Ultraviolet--florescence
Electron--scanning, transmission
what type of microscope do we use in the lab? Ans: bright field
light microscope
, 4
how does a microscope work? Ans: light source is on the
bottom. The light travels from the lamp, hits the condenser
lents which collects light and points it toward the object. the
light passes through the objective lens and the real image of
the object forms behind the ocular lens. the image we see is
the virtual image after it asses through the ocular lens and is
at the total magnification
Highest magnification for all light microscopes? Ans: 2,000X
and 200 nm resolution
© 2026 Assignment
eubacteria Ans: the common bacteria of the 2 types. (-) WITH
cell walls, (+) WITH cell walls, and no cell wall (mycoplasm)
Guru01 - Stuvia
Expert
archebacteria Ans: less common type of bacteria. do not
produce peptidoglycan and can live in extreme environments
appendages Ans: attached to bacteria on one side, the other
side is "free"
motility appendages Ans: flagella and axial filaments
flagella Ans: for motility and self propulsion. found mostly in
gram negative bacteria. provide a smooth forward movement
structure of flagella Ans: made of protein with 3 distinct parts:
filament, hook, basal body (inside and has 4 rings and a rod
that rotate)
axial filament Ans: wrap around the cell and cause spiral like
movements. has only two parts: a long thin microfibril
inserted into a hook.
attachment appendages Ans: fimbriae and pili
