Question 1

Which of the following statements best explains why prokaryotic cells are generally small in size?

Accepted Answer

Small size increases the surface area-to-volume ratio, enhancing nutrient uptake by diffusion.

Question 2

A bacterium is placed in a hypertonic solution. Predict the outcome for the cell and select the correct explanation.

Accepted Answer

The cell will lose water, resulting in plasmolysis as the plasma membrane shrinks away from the cell wall.

Question 3

Which structural feature distinguishes the plasma membrane of Archaea from that of Bacteria?

Accepted Answer

Archaeal membranes contain long-branched ether-linked lipids, while bacterial membranes contain linear ester-linked fatty acids.

Question 4

Which of the following arrangements is characteristic of Streptococcus pneumoniae after Gram staining?

Accepted Answer

Chains of purple-stained cocci (streptococci)

Question 5

Which equation best represents the relationship between surface area and volume for a cube-shaped cell, and why is this important for prokaryotes?

Accepted Answer

Surface area: $$6a^2$$, Volume: $$a^3$$, so surface area-to-volume ratio is $$\frac{6}{a}$$; higher ratios facilitate efficient diffusion.

Question 6

Which of the following is a clinically significant consequence of Gram-negative bacteria possessing an outer membrane?

Accepted Answer

They are more resistant to many antibiotics and disinfectants due to the selective barrier provided by the outer membrane.

Question 7

Which statement correctly describes the process of binary fission in prokaryotes?

Accepted Answer

DNA is copied, the cell elongates, a septum forms, and two daughter cells are separated.

Question 8

Which of the following best explains why acid-fast bacteria, such as Mycobacterium tuberculosis, require long, multidrug therapies?

Accepted Answer

Their waxy cell wall containing mycolic acids prevents drugs from easily crossing, slowing growth and making them resistant.

Question 9

A patient is diagnosed with a persistent infection caused by L-form bacteria. Which property of L-forms contributes to their persistence?

Accepted Answer

L-forms lack a cell wall, making them resistant to antibiotics that target cell wall synthesis.

Question 10

Which of the following is NOT a function of prokaryotic membrane proteins?

Accepted Answer

Photosynthesis

Question 11

Which transport mechanism is described by the equation $$\Delta G = RT \ln \left( \frac{[C]_{in}}{[C]_{out}} \right)$$, and what does it represent?

Accepted Answer

Passive transport (diffusion); it represents the free energy change for moving a solute down its concentration gradient.

Question 12

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

Accepted Answer

Plasmids provide advantages such as antibiotic resistance and virulence factors, and can be transferred between bacteria.

Question 13

Which of the following is a real-world consequence of biofilm formation in clinical settings?

Accepted Answer

Biofilms increase resistance to antibiotics and immune responses, leading to persistent infections on medical devices.

Question 14

Which of the following best describes the difference between Gram-positive and Gram-negative cell walls?

Accepted Answer

Gram-positive cell walls have a thick peptidoglycan layer and teichoic acids, while Gram-negative cell walls have a thin peptidoglycan layer and an outer membrane with lipopolysaccharides.

Question 15

Which flagella arrangement would most likely be observed in a bacterium that moves rapidly toward a chemical attractant?

Accepted Answer

Lophotrichous (tuft of flagella at one pole)

Question 16

Which of the following is a key feature of endospores that makes them a challenge in healthcare settings?

Accepted Answer

Endospores are highly resistant to environmental stresses and conventional disinfectants, requiring autoclaving for sterilization.

Question 17

Which of the following best describes the role of inclusion bodies in prokaryotic cells?

Accepted Answer

Inclusion bodies store useful substances such as carbon-fixing enzymes or magnetic iron.

Question 18

Which of the following is a correct statement about the nucleoid region in prokaryotic cells?

Accepted Answer

The nucleoid region contains the single, circular chromosome and is not surrounded by a membrane.

Introduction to Prokaryotes: Structure, Function, and Clinical Relevance

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