Question 1

Which of the following statements best explains why penicillin is more effective against gram-positive bacteria than gram-negative bacteria?

Accepted Answer

Gram-positive bacteria have a thick peptidoglycan layer that is the primary target of penicillin, while gram-negative bacteria have an outer membrane that protects the thin peptidoglycan layer.

Question 2

A bacterium is found to survive in extremely salty environments and lacks peptidoglycan in its cell wall. To which domain does it most likely belong?

Accepted Answer

Archaea

Question 3

Which component of the gram-negative bacterial cell wall is responsible for causing fever and shock in infected patients?

Accepted Answer

Lipid A

Question 4

Which of the following best describes the function of teichoic acids in gram-positive bacteria?

Accepted Answer

They regulate ion transport and provide antigenic specificity.

Question 5

A patient is infected with Mycobacterium tuberculosis. Which staining technique would be most appropriate to identify this bacterium in a clinical sample?

Accepted Answer

Acid-fast stain

Question 6

Which of the following is a unique feature of the peptidoglycan structure in bacterial cell walls?

Accepted Answer

Tetrapeptide side chains with alternating D and L amino acids

Question 7

Which process allows prokaryotic cells to transport glucose into the cell while simultaneously modifying it so it cannot diffuse back out?

Accepted Answer

Group translocation

Question 8

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

Accepted Answer

The cell will undergo plasmolysis as water leaves the cytoplasm.

Question 9

Which of the following statements about bacterial endospores is FALSE?

Accepted Answer

Endospore formation is a means of reproduction for bacteria.

Question 10

Which of the following antibiotics targets the 30S subunit of the bacterial ribosome?

Accepted Answer

Streptomycin

Question 11

Which of the following best describes the difference between protoplasts and spheroplasts?

Accepted Answer

Protoplasts are wall-less gram-positive cells, while spheroplasts are gram-negative cells with damaged cell walls but intact membranes.

Question 12

Which of the following is NOT a characteristic of viruses?

Accepted Answer

They carry out metabolic reactions outside a host cell.

Question 13

Which of the following statements about plasmids is TRUE?

Accepted Answer

Plasmids often carry genes that confer antibiotic resistance.

Question 14

Which of the following is a function of the O polysaccharide in the lipopolysaccharide (LPS) layer of gram-negative bacteria?

Accepted Answer

Acts as an antigen for distinguishing bacterial species.

Question 15

Which of the following best explains why lysozyme is more effective against gram-positive bacteria than gram-negative bacteria?

Accepted Answer

Gram-positive bacteria have an exposed thick peptidoglycan layer, while gram-negative bacteria have an outer membrane that protects the peptidoglycan.

Question 16

Which of the following is a distinguishing feature of fungal cell walls compared to bacterial cell walls?

Accepted Answer

Fungal cell walls are composed of chitin, while bacterial cell walls are composed of peptidoglycan.

Question 17

Which of the following best describes the role of dipicolinic acid in bacterial endospores?

Accepted Answer

It helps protect the DNA from damage during extreme conditions.

Question 18

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

Accepted Answer

It contains proteins such as MreB, ParM, crescentin, and FtsZ that are functionally similar to eukaryotic cytoskeletal proteins.

Question 19

Which of the following is a correct description of the process of sporulation in bacteria?

Accepted Answer

A portion of the cytoplasm and a duplicated chromosome are isolated by a spore septum, followed by the formation of a thick spore coat.

Microbial World and Functional Anatomy of Prokaryotic Cells: Study Notes

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