Question 1

Which scientist is credited with disproving the theory of spontaneous generation and establishing the germ theory of disease?

Accepted Answer

Louis Pasteur

Question 2

Which of the following statements best describes the main difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have membrane-bound organelles, while prokaryotic cells do not.

Question 3

Which of the following is NOT a characteristic of viruses?

Accepted Answer

They can replicate independently outside a host cell.

Question 4

Which of the following is a correct application of Koch’s postulates in identifying the causative agent of a new infectious disease?

Accepted Answer

Find the suspected microbe in every case of the disease, isolate it in pure culture, reproduce the disease in a healthy host, and recover the same microbe.

Question 5

Which of the following cell structures is present in both prokaryotic and eukaryotic cells?

Accepted Answer

Cytoplasmic membrane

Question 6

Which of the following best explains why prokaryotic cells can rapidly take up nutrients from their environment?

Accepted Answer

They have a large surface-to-volume ratio.

Question 7

Which of the following is a unique feature of the cell membrane of Archaea compared to Bacteria and Eukarya?

Accepted Answer

Presence of branched hydrocarbon chains attached to glycerol by ether linkages

Question 8

Which of the following best describes the function of ribosomes in both prokaryotic and eukaryotic cells?

Accepted Answer

Protein synthesis

Question 9

A scientist isolates a microorganism with the following characteristics: unicellular, eukaryotic, lacks a cell wall, and is motile. To which group does this organism most likely belong?

Accepted Answer

Protozoa

Question 10

Which of the following statements about the Three Domain System is correct?

Accepted Answer

It classifies organisms based on rRNA nucleotide sequence differences.

Question 11

Which of the following is true regarding the cell wall composition of the three domains?

Accepted Answer

Archaea have cell walls that lack peptidoglycan.

Question 12

Which of the following best describes the arrangement of microtubules in a eukaryotic flagellum?

Accepted Answer

A 9+2 arrangement of microtubules

Question 13

Which of the following is a correct statement about the electron transport chain in prokaryotic and eukaryotic cells?

Accepted Answer

In eukaryotes, it is located in the inner mitochondrial membrane.

Question 14

Which of the following antibiotics would most likely be effective against bacteria but not against Archaea or Eukarya?

Accepted Answer

An antibiotic that targets peptidoglycan synthesis

Question 15

Which of the following best explains why viruses are not classified as prokaryotic or eukaryotic?

Accepted Answer

They are acellular and possess both living and nonliving characteristics.

Question 16

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

Accepted Answer

Protection against desiccation and phagocytosis

Question 17

Which of the following best describes the process by which eukaryotic cells divide to produce haploid sex cells?

Accepted Answer

Meiosis

Question 18

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

Accepted Answer

They are composed of a 50S and a 30S subunit forming a 70S ribosome.

Question 19

Which of the following is a real-world example of the application of genetic engineering using bacteria?

Accepted Answer

Using bacteria to produce human insulin for diabetic patients

Question 20

Which of the following best explains why comparing rRNA sequences is useful for classifying organisms in the Three Domain System?

Accepted Answer

rRNA molecules carry out the same function in all organisms and change very little over time.

Introduction to Microbiology: The Microbial World, Cell Structure, and Classification

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