Question 1

Which process is depicted in the first image, and what is the mathematical formula for the number of bacterial cells after n generations if starting with a single cell?

Accepted Answer

Binary fission; $$N = 2^n$$

Question 2

A patient presents with a severe cough and high fever. A Gram stain of their sputum reveals gram-positive diplococci with a capsule. Which organism is most likely responsible?

Accepted Answer

Streptococcus pneumoniae

Question 3

Which bacterial cell wall type is characterized by a thick peptidoglycan layer and retains the crystal violet stain during Gram staining?

Accepted Answer

Gram-positive

Question 4

Which of the following best describes the function of bacterial endospores?

Accepted Answer

They allow bacteria to survive harsh environmental conditions.

Question 5

A laboratory technician observes rod-shaped bacteria arranged in chains under the microscope. What is the correct term for this arrangement?

Accepted Answer

Streptobacillus

Question 6

Which of the following antibiotics inhibits the synthesis of peptidoglycan, thereby weakening the bacterial cell wall?

Accepted Answer

Penicillin

Question 7

Which structure is responsible for bacterial motility and is often targeted by the immune system?

Accepted Answer

Flagellum

Question 8

A bacterium with a thin peptidoglycan layer and an outer membrane containing lipopolysaccharide is classified as:

Accepted Answer

Gram-negative

Question 9

Which of the following best explains why Mycobacterium tuberculosis grows slowly?

Accepted Answer

It has a waxy lipid layer in its cell wall that limits nutrient uptake.

Question 10

Which of the following is NOT a function of the bacterial glycocalyx?

Accepted Answer

Protein synthesis

Question 11

A patient is diagnosed with anthrax after handling animal hides. Which form of anthrax is most likely, and what is the expected mortality rate with treatment?

Accepted Answer

Cutaneous anthrax; 1%

Question 12

Which of the following best describes the difference between bacterial endospores and fungal spores?

Accepted Answer

Bacterial endospores are for survival, while fungal spores are for reproduction.

Question 13

Which bacterial structure is primarily responsible for the transfer of plasmids between cells during conjugation?

Accepted Answer

Conjugation pilus

Question 14

If a single bacterium with a generation time of 30 minutes is placed in a nutrient-rich environment, how many cells will there be after 3 hours, assuming no cell death?

Accepted Answer

$$N = 2^6$ = 64$$

Question 15

Which of the following is a correct statement about the Gram stain procedure?

Accepted Answer

Gram-positive bacteria retain the crystal violet stain and appear purple.

Question 16

A bacterial sample is found to lack a cell wall. Which disease is most likely associated with this organism?

Accepted Answer

Walking pneumonia

Question 17

Which of the following best explains why Streptococcus pneumoniae is able to evade phagocytosis?

Accepted Answer

It possesses a capsule that inhibits phagocyte recognition.

Question 18

Which of the following is a real-world example of zoonosis transmission?

Accepted Answer

A person contracts anthrax after handling contaminated animal hides.

Question 19

Which of the following best describes the arrangement of cocci in a staphylococcus?

Accepted Answer

Grape-like clusters

Question 20

Which of the following is a function of plasmids in bacteria?

Accepted Answer

Carrying nonessential genes, such as antibiotic resistance genes

Bacterial Structure, Growth, and Associated Diseases: Study Notes for Anatomy & Physiology

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