MICROBIOLOGY UNIT 1-3 EXAM KEY
QUESTIONS WITH VERIFIED ANSWERS [
GRADED A+]
All organisms descended from a single universal common ancestor. -
✔✔True
Bacteria are organisms that have a membrane bound nucleus and
organelles. - ✔✔False
Carl Woese provided the first conclusive demonstration that life does not
arise
spontaneously via the swan-necked flask experiment. - ✔✔False
©morren 2025/2026. Year published 2026.
,A classical demonstration of Koch's postulates would show that a pure
culture of a suspected pathogen can cause disease in a healthy animal. -
✔✔True
Robert Hooke built the first compound microscope and coined the term
"cell". - ✔✔True
The resolution limit of a light microscope is 1 um. - ✔✔False
Gram Negative cells are stained purple, while Gram Positive cells are
stained pink. This is considered a simple stain. - ✔✔False
Phase contrast microscopy relies on organism causing a difference in the
refractive index from the surrounding medium. - ✔✔True
Cells have a high surface area-to-volume ratio to increase the efficiency of
nutrient uptake and diffusion of molecules within the cell. - ✔✔True
©morren 2025/2026. Year published 2026.
, Bacterial lipids contain phytanyl tails and phosphate head groups. -
✔✔False
Cell membranes are impermeable to complex sugars. - ✔✔True
Gram-Positive cells contain LPS. - ✔✔False
S-layers are self-assembling proteins or glycoproteins that form an
outermost structured layer of a cell. - ✔✔True
Gram-Negative cells have an inner and outer membrane, which contain a
periplasmic space. - ✔✔True
If a bacterial cell without a cell wall is placed in a hypotonic solution, it will
lyse. - ✔✔True
©morren 2025/2026. Year published 2026.
QUESTIONS WITH VERIFIED ANSWERS [
GRADED A+]
All organisms descended from a single universal common ancestor. -
✔✔True
Bacteria are organisms that have a membrane bound nucleus and
organelles. - ✔✔False
Carl Woese provided the first conclusive demonstration that life does not
arise
spontaneously via the swan-necked flask experiment. - ✔✔False
©morren 2025/2026. Year published 2026.
,A classical demonstration of Koch's postulates would show that a pure
culture of a suspected pathogen can cause disease in a healthy animal. -
✔✔True
Robert Hooke built the first compound microscope and coined the term
"cell". - ✔✔True
The resolution limit of a light microscope is 1 um. - ✔✔False
Gram Negative cells are stained purple, while Gram Positive cells are
stained pink. This is considered a simple stain. - ✔✔False
Phase contrast microscopy relies on organism causing a difference in the
refractive index from the surrounding medium. - ✔✔True
Cells have a high surface area-to-volume ratio to increase the efficiency of
nutrient uptake and diffusion of molecules within the cell. - ✔✔True
©morren 2025/2026. Year published 2026.
, Bacterial lipids contain phytanyl tails and phosphate head groups. -
✔✔False
Cell membranes are impermeable to complex sugars. - ✔✔True
Gram-Positive cells contain LPS. - ✔✔False
S-layers are self-assembling proteins or glycoproteins that form an
outermost structured layer of a cell. - ✔✔True
Gram-Negative cells have an inner and outer membrane, which contain a
periplasmic space. - ✔✔True
If a bacterial cell without a cell wall is placed in a hypotonic solution, it will
lyse. - ✔✔True
©morren 2025/2026. Year published 2026.
