Question 1

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

Accepted Answer

It protects the cell from dehydration, aids in adhesion, biofilm formation, and camouflage.

Question 2

A scientist observes a bacterium with a thick peptidoglycan layer, teichoic acids, and no outer membrane. Which type of cell wall does this bacterium possess?

Accepted Answer

Gram positive cell wall

Question 3

Which structure is primarily responsible for the transfer of DNA from one bacterial cell to another during conjugation?

Accepted Answer

Pili

Question 4

Lipopolysaccharide (LPS) is found in which part of a bacterial cell?

Accepted Answer

Outer membrane of Gram negative bacteria

Question 5

Which of the following best explains why endospores are highly resistant to extreme environmental conditions?

Accepted Answer

They contain a core of DNA, RNA, proteins, dipicolinic acid, and Ca$^{2+}$, surrounded by multiple protective layers.

Question 6

Which genera of bacteria are known for their ability to produce endospores?

Accepted Answer

Bacillus and Clostridium

Question 7

A bacterial cell is placed in a hypertonic solution. What is the most likely outcome for a cell with a cell wall?

Accepted Answer

The cell membrane will pull away from the cell wall, causing plasmolysis.

Question 8

Which of the following is a correct example of passive transport in bacterial cells?

Accepted Answer

Osmosis of water across the cell membrane

Question 9

What is the main structural difference between Gram positive and Gram negative bacterial cell walls?

Accepted Answer

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

Question 10

Which bacterial structure is most directly involved in biofilm formation and adhesion to surfaces?

Accepted Answer

Capsule

Question 11

During sporulation, which step occurs first in the process of a vegetative cell becoming an endospore?

Accepted Answer

The cell stops growing and the chromosomal DNA is replicated.

Question 12

Which of the following statements about plasmids is correct?

Accepted Answer

Plasmids are small, circular pieces of DNA not included in the chromosome and may give survival advantage.

Question 13

Which cell component is responsible for protein synthesis in both prokaryotic and eukaryotic cells?

Accepted Answer

Ribosome

Question 14

A bacterial cell lacking fimbriae would most likely have difficulty with which function?

Accepted Answer

Adhering to surfaces

Question 15

Which of the following is true regarding teichoic and lipoteichoic acids?

Accepted Answer

Teichoic acids do not touch the cell membrane, while lipoteichoic acids do.

Question 16

Which of the following best describes the function of porins in Gram negative bacteria?

Accepted Answer

They form channels for facilitated diffusion of sugars and other small molecules.

Question 17

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

Accepted Answer

Protein synthesis

Question 18

Which eukaryotic cell component is responsible for storing DNA?

Accepted Answer

Nucleus

Question 19

A bacterial cell is placed in a hypotonic solution. What is the most likely outcome for an animal cell in the same solution?

Accepted Answer

The cell will swell and burst due to water influx.

Question 20

Which of the following best describes active transport in bacterial cells?

Accepted Answer

Movement of substances against their concentration gradient, requiring ATP.

Prokaryotic and Eukaryotic Cell Structure and Function: Microbiology Study Notes

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