Microbiology: The Human Experience, 2nd Edition : Test Bank ; Verified Exam Questions & Answer Guide | John W. Foster, Zarrintaj Aliabadi & Joan L. Slonczewski | Essential Study Resource, Chapter-Based Practice Materials

Microbiology: The Human Experience,
2nd Edition : Test Bank ; Verified Exam
Questions & Answer Guide | John W.
Foster, Zarrintaj Aliabadi & Joan L.
Slonczewski | Essential Study Resource,
Chapter-Based Practice Materials



Chapter 1: Microbes Shape Our History

1. Which of the following is NOT considered a benefit of microorganisms?

 A. Nitrogen fixation
 B. Production of fermented foods
 C. Synthesis of vitamins
 D. Causative agents of disease

Answer: D. Microorganisms provide numerous benefits including nitrogen fixation (A),
fermentation of foods such as yogurt and bread (B), and synthesis of vitamins like vitamin
K (C). Being causative agents of disease is a harmful effect, not a benefit .




2. A microbe that is 50 nm in size would most likely be:

 A. Fungi
 B. E. coli

,  C. Virus
 D. Algae

Answer: C. Viruses are typically 20–300 nm in size, making a 50 nm particle most likely a
virus . Fungi (A) are much larger; E. coli (B) is a bacterium approximately 1–2 μm; algae
(D) are also larger.




3. Based on the figure shown, the type of organism indicated with an arrow could
be a:

 A. Virus
 B. Bacteria
 C. Macroscopic fungi
 D. Large ameba

Answer: B. Bacteria are prokaryotic cells visible under a light microscope . Viruses are too
small to be seen with a compound light microscope; macroscopic fungi and large amebas
are eukaryotic and appear differently.




4. Antibiotics target cellular metabolic enzymes. Which organism would NOT be
affected by such an antibiotic?

 A. Streptococcus pyogenes bacteria
 B. Herpes virus
 C. Ameba
 D. Bread mold

,Answer: B. Viruses lack cellular metabolic enzymes because they are not cellular
organisms and rely on host cell machinery. Antibiotics that target metabolic enzymes
affect bacteria, fungi, and protozoa but have no effect on viruses .




5. Which scientist is credited with constructing the first microscope?

 A. Antonie van Leeuwenhoek
 B. Catherine of Siena
 C. Robert Hooke
 D. Louis Pasteur

Answer: C. Robert Hooke constructed the first compound microscope and observed cells in
cork. Van Leeuwenhoek (A) improved microscope design but Hooke constructed the first;
Pasteur (D) disproved spontaneous generation .




6. Which of the following was an unexpected benefit of the bubonic plague?

 A. There was no benefit to the bubonic plague.
 B. The population of Europe experienced a baby boom.
 C. It resulted in a better understanding of aseptic practices.
 D. The population decline enabled the cultural advancement of the Renaissance.

Answer: D. The population decline from the bubonic plague reduced labor shortages and
contributed to economic and cultural changes that enabled the Renaissance .

, 7. Which organism would you NOT be able to see using Robert Hooke's
microscope?

 A. Vinegar eels
 B. Dust mites
 C. Mold filaments
 D. Mycobacterium tuberculosis

Answer: D. Mycobacterium tuberculosis is a bacterium too small to be seen with Hooke's
primitive microscope. Vinegar eels (A), dust mites (B), and mold filaments (C) are larger
eukaryotic organisms or structures .




8. If Spallanzani had unknowingly poked a hole in the top of his flask of meat
broth, what would this have implied about the theory of spontaneous generation?

 A. No growth would have occurred, refuting the theory.
 B. No growth would have occurred, supporting the theory.
 C. Growth would have occurred, refuting the theory.
 D. Growth would have occurred, supporting the theory.

Answer: D. Spallanzani's sealed flasks showed no growth, refuting spontaneous
generation. If a hole allowed microbes to enter, growth would occur, supporting the theory
.




9. What would John Tyndall have needed to disprove the theory of spontaneous
generation?

 A. A swan-neck flask