General Microbiology Exam 2026/2027| = = = =
Complete Study Guide with Verified Solutions &
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Practice Questions (A+ Graded) = = = =
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SECTION 1: HISTORY OF MICROBIOLOGY & SPONTANEOUS
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GENERATION (Questions 1-25) = = =
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Question 1: = =
Which scientist is credited with the first detailed observations of live
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microorganisms using simple microscopes? = = = =
A) Robert Hooke = =
B) Antonie van Leeuwenhoek= = =
C) Louis Pasteur
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D) Francesco Redi = =
Answer: B) Antonie van Leeuwenhoek
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Rationale: Van Leeuwenhoek is credited with first observing and de
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scribing live microorganisms, which he called "animalcules," using ha
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ndcrafted microscopes in the 17th century . He was the first to observ
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e bacteria, protozoa, and other microorganisms, earning him the titl
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,e "Father of Microbiology." Hooke observed cells in cork; Pasteur di
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sproved spontaneous generation; Redi disproved spontaneous gen
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eration of maggots. = = =
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Question 2: = =
The theory that living organisms could arise spontaneously from non-
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living matter is known as:
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A) Biogenesis =
B) Germ Theory = =
C) Spontaneous Generation = =
D) Cell Theory = =
Answer: C) Spontaneous Generation
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Rationale: The concept of spontaneous generation, historically prop
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osed by Aristotle, suggested that life could emerge from non-
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living material like decaying meat . This theory persisted for centurie
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s until experiments by Redi, Spallanzani, and Pasteur disproved it. B
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iogenesis is the opposite theory—that life arises only from pre-
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existing life. = =
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Question 3: = =
, Louis Pasteur's definitive experiment that disproved spontaneous ge
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neration involved a specialized flask. What was its most critical desi
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gn feature?
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A) A glass barrier to prevent contamination
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B) A cotton plug to filter air
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C) A swan- =
necked design that allowed air exchange but trapped microbes
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D) A sealed vacuum design
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Answer: C) A swan- = = =
necked design that allowed air exchange but trapped microbes
= = = = = = = = =
Rationale: Pasteur's swan- = =
necked flask allowed air to enter but trapped dust and microbes in t
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he bend of the neck, preventing contamination. The broth remained s
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terile until the flask was tilted to allow the trapped microbes to conta
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ct the broth . This experiment definitively disproved spontaneous ge
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neration. =
=
Question 4: = =
Which scientist is credited with establishing the Germ Theory of Dise
= = = = = = = = = =
ase and developing Koch's postulates?
= = = = =
Complete Study Guide with Verified Solutions &
= = = = = = =
Practice Questions (A+ Graded) = = = =
=
SECTION 1: HISTORY OF MICROBIOLOGY & SPONTANEOUS
= = = = = = =
GENERATION (Questions 1-25) = = =
=
Question 1: = =
Which scientist is credited with the first detailed observations of live
= = = = = = = = = = =
microorganisms using simple microscopes? = = = =
A) Robert Hooke = =
B) Antonie van Leeuwenhoek= = =
C) Louis Pasteur
= =
D) Francesco Redi = =
Answer: B) Antonie van Leeuwenhoek
= = = = =
Rationale: Van Leeuwenhoek is credited with first observing and de
= = = = = = = = =
scribing live microorganisms, which he called "animalcules," using ha
= = = = = = = =
ndcrafted microscopes in the 17th century . He was the first to observ
= = = = = = = = = = = =
e bacteria, protozoa, and other microorganisms, earning him the titl
= = = = = = = = =
,e "Father of Microbiology." Hooke observed cells in cork; Pasteur di
= = = = = = = = = =
sproved spontaneous generation; Redi disproved spontaneous gen
= = = = = =
eration of maggots. = = =
=
Question 2: = =
The theory that living organisms could arise spontaneously from non-
= = = = = = = = =
living matter is known as:
= = = = =
A) Biogenesis =
B) Germ Theory = =
C) Spontaneous Generation = =
D) Cell Theory = =
Answer: C) Spontaneous Generation
= = = =
Rationale: The concept of spontaneous generation, historically prop
= = = = = = =
osed by Aristotle, suggested that life could emerge from non-
= = = = = = = = =
living material like decaying meat . This theory persisted for centurie
= = = = = = = = = =
s until experiments by Redi, Spallanzani, and Pasteur disproved it. B
= = = = = = = = = =
iogenesis is the opposite theory—that life arises only from pre-
= = = = = = = = =
existing life. = =
=
Question 3: = =
, Louis Pasteur's definitive experiment that disproved spontaneous ge
= = = = = = =
neration involved a specialized flask. What was its most critical desi
= = = = = = = = = =
gn feature?
= =
A) A glass barrier to prevent contamination
= = = = = =
B) A cotton plug to filter air
= = = = = =
C) A swan- =
necked design that allowed air exchange but trapped microbes
= = = = = = = = =
D) A sealed vacuum design
= = = =
Answer: C) A swan- = = =
necked design that allowed air exchange but trapped microbes
= = = = = = = = =
Rationale: Pasteur's swan- = =
necked flask allowed air to enter but trapped dust and microbes in t
= = = = = = = = = = = =
he bend of the neck, preventing contamination. The broth remained s
= = = = = = = = = =
terile until the flask was tilted to allow the trapped microbes to conta
= = = = = = = = = = = =
ct the broth . This experiment definitively disproved spontaneous ge
= = = = = = = = =
neration. =
=
Question 4: = =
Which scientist is credited with establishing the Germ Theory of Dise
= = = = = = = = = =
ase and developing Koch's postulates?
= = = = =
