Question 1

Which of the following best describes the four major processes of living cells?

Accepted Answer

Growth, reproduction, responsiveness, and metabolism

Question 2

A patient is diagnosed with a bacterial infection. The causative agent is found to have a thick peptidoglycan layer and teichoic acids. Which type of cell wall does this bacterium most likely possess?

Accepted Answer

Gram-positive cell wall

Question 3

Which of the following statements correctly compares prokaryotic and eukaryotic cells?

Accepted Answer

Prokaryotic cells lack a membrane-bound nucleus, while eukaryotic cells possess one.

Question 4

Which of the following best distinguishes a bacterial capsule from a slime layer?

Accepted Answer

A capsule is organized and firmly attached to the cell wall, while a slime layer is loose and water-soluble.

Question 5

A bacterium is observed to have flagella distributed all over its surface. What is the term for this flagellar arrangement?

Accepted Answer

Peritrichous

Question 6

Which of the following is a function of bacterial fimbriae?

Accepted Answer

Attachment to surfaces and other cells

Question 7

Which of the following best describes the structure of peptidoglycan?

Accepted Answer

A mesh-like polymer of sugars and amino acids

Question 8

A Gram-negative bacterium is more resistant to certain antibiotics than a Gram-positive bacterium. Which structural feature is primarily responsible for this?

Accepted Answer

The presence of an outer membrane containing lipopolysaccharide (LPS)

Question 9

Which of the following is a clinical implication of the Gram-negative cell wall structure?

Accepted Answer

Lipopolysaccharide (LPS) can act as an endotoxin, causing fever and shock in patients.

Question 10

Which of the following best describes the function of endospores in bacteria?

Accepted Answer

They allow bacteria to survive harsh environmental conditions.

Question 11

A laboratory technician is comparing ribosomes from a bacterial cell and a human cell. Which of the following statements is correct?

Accepted Answer

Bacterial ribosomes are 70S, while human (eukaryotic) ribosomes are 80S.

Question 12

Which of the following organelles is responsible for ATP production in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 13

A scientist is studying a cell that contains both a nucleus and chloroplasts. Which type of organism is this cell most likely from?

Accepted Answer

A plant

Question 14

According to the endosymbiotic theory, which of the following statements is correct?

Accepted Answer

Mitochondria and chloroplasts originated from free-living prokaryotes engulfed by ancestral eukaryotic cells.

Question 15

Which of the following is NOT evidence supporting the endosymbiotic theory?

Accepted Answer

Mitochondria and chloroplasts have linear DNA similar to eukaryotic chromosomes.

Question 16

A patient is infected with Mycobacterium tuberculosis, which has an acid-fast cell wall. Which component is primarily responsible for the acid-fast property?

Accepted Answer

Mycolic acid in the cell wall

Question 17

Which of the following best describes the function of the Golgi body in eukaryotic cells?

Accepted Answer

Modification, sorting, and packaging of proteins and lipids

Question 18

A bacterium is found to lack both fimbriae and pili. Which of the following is a likely consequence?

Accepted Answer

It will have reduced ability to adhere to surfaces and other cells.

Question 19

Which of the following equations best represents the relationship between the number of protons ($$Z$$), neutrons ($$N$$), and the mass number ($$A) of an $$atom found in a bacterial cell?

Accepted Answer

$$A = Z + N$$

Question 20

A researcher is studying the effect of antibiotics on ribosomes. Which of the following antibiotics would most likely inhibit protein synthesis in bacteria but not in human cells, and why?

Accepted Answer

An antibiotic that targets 70S ribosomes, because bacterial ribosomes are 70S and human ribosomes are 80S.

Cell Structure and Function in Microbiology: Study Guide and Key Concepts

Guida di studio - Domande di pratica

Study guide - Flashcard