Question 1

Which of the following best describes the function of a bacterial capsule?

Accepted Answer

It prevents host recognition and helps the bacterium evade the immune system.

Question 2

A Gram-negative bacterium is characterized by which of the following cell wall features?

Accepted Answer

A thin peptidoglycan layer and an outer membrane containing lipopolysaccharide.

Question 3

Which of the following statements about the cytoplasmic membrane in prokaryotes is correct?

Accepted Answer

It is composed of a phospholipid bilayer and is selectively permeable.

Question 4

A scientist is using a light microscope to distinguish between two closely spaced bacteria. Which property of the microscope is most critical for this task?

Accepted Answer

Resolution

Question 5

Which of the following best explains why oxygen is toxic to obligate anaerobes?

Accepted Answer

They lack enzymes to detoxify reactive oxygen species such as superoxide radicals and hydrogen peroxide.

Question 6

During glycolysis, what is the net gain of ATP and NADH molecules per molecule of glucose?

Accepted Answer

$$2$$ ATP and $$2$$ NADH

Question 7

Which of the following is a function of the eukaryotic Golgi body?

Accepted Answer

Modifying, processing, and packaging large molecules to export

Question 8

A microbiologist stains a bacterial sample and observes that the cells appear pink under the microscope. Which of the following is the most likely explanation?

Accepted Answer

The bacteria are Gram-negative and have a thin peptidoglycan layer with an outer membrane.

Question 9

Which of the following best describes the endosymbiotic theory?

Accepted Answer

Eukaryotic cells evolved from prokaryotes by engulfing smaller prokaryotes that became organelles such as mitochondria.

Question 10

Which of the following is NOT a function of prokaryotic fimbriae?

Accepted Answer

Movement via rotation

Question 11

A patient is infected with a bacterium that is resistant to phagocytosis. Which structure is most likely responsible for this resistance?

Accepted Answer

Capsule

Question 12

Which of the following best describes the role of NAD$$^+ in $$cellular respiration?

Accepted Answer

It serves as an electron carrier, accepting electrons during glycolysis and the Krebs cycle.

Question 13

Which of the following statements about anabolic pathways is correct?

Accepted Answer

They synthesize large molecules from smaller precursors and require energy input.

Question 14

A microbiologist is using a fluorescence microscope to detect a specific pathogen in a tissue sample. Which principle allows this technique to work?

Accepted Answer

The use of antibodies tagged with fluorescent dyes that bind to the pathogen.

Question 15

Which of the following is a correct statement about the Calvin-Benson cycle in photosynthesis?

Accepted Answer

It fixes carbon dioxide into organic molecules using ATP and NADPH.

Question 16

Which of the following best explains why a facultative anaerobe can survive in both the presence and absence of oxygen?

Accepted Answer

It can use oxygen for respiration when available but can also switch to fermentation or anaerobic respiration.

Question 17

Which of the following is a primary function of the cytoskeleton in eukaryotic cells?

Accepted Answer

Anchoring organelles and providing shape to the cell

Question 18

A researcher is studying a microbe that can use light energy to synthesize carbohydrates from CO$$_2$$ and H$$_2O. $$Which term best describes this organism?

Accepted Answer

Photoautotroph

Question 19

Which of the following best describes the process of chemiosmosis in cellular respiration?

Accepted Answer

The use of an electrochemical gradient to generate ATP as protons flow through ATP synthase.

Question 20

Which of the following statements about taxonomy is correct?

Accepted Answer

It involves classification, naming, and identification of organisms.

Fundamentals of Microbial Cell Structure, Function, and Growth

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