Question 1

Which of the following statements best describes the role of normal microbiota in human health?

Accepted Answer

Normal microbiota prevent the growth of pathogens and produce essential growth factors such as vitamins B and K.

Question 2

Which of the following is NOT a characteristic of Archaea?

Accepted Answer

They have peptidoglycan cell walls.

Question 3

A scientist discovers a single-celled organism with a nucleus, chitin cell walls, and the ability to absorb organic chemicals for energy. To which group does this organism most likely belong?

Accepted Answer

Fungi

Question 4

Which of the following best explains why viruses are considered acellular?

Accepted Answer

They consist of a DNA or RNA core surrounded by a protein coat and can only replicate inside a living host cell.

Question 5

Which of the following is an example of bioremediation?

Accepted Answer

Using bacteria to degrade organic matter in sewage and detoxify pollutants such as oil and mercury.

Question 6

Which of the following is a correct application of scientific nomenclature?

Accepted Answer

Staphylococcus aureus

Question 7

Which of the following statements about biofilms is TRUE?

Accepted Answer

Biofilms are masses of microbes that attach to solid surfaces and are often resistant to antibiotics.

Question 8

Which of the following is NOT a beneficial activity of microorganisms?

Accepted Answer

Causing emerging infectious diseases

Question 9

Which of the following best describes the three-domain system of classification developed by Carl Woese?

Accepted Answer

It classifies organisms into Bacteria, Archaea, and Eukarya based on cellular organization.

Question 10

Which of the following scenarios best illustrates the concept of an emerging infectious disease (EID)?

Accepted Answer

A new disease, such as SARS, that is increasing in incidence worldwide.

Question 11

Which of the following is a correct example of biotechnology that uses recombinant DNA technology?

Accepted Answer

Using bacteria to produce human insulin.

Question 12

A patient is infected with a bacterium that lacks peptidoglycan in its cell wall and thrives in extremely salty environments. To which domain does this organism most likely belong?

Accepted Answer

Archaea

Question 13

Which of the following best explains why antibiotics are ineffective against viral infections?

Accepted Answer

Viruses lack the cellular structures targeted by antibiotics and can only replicate inside host cells.

Question 14

Which of the following is a real-world example of microbial resistance?

Accepted Answer

The emergence of methicillin-resistant Staphylococcus aureus (MRSA) in hospitals.

Question 15

Which of the following best describes the process of binary fission?

Accepted Answer

A prokaryotic cell divides into two genetically identical cells by duplicating its DNA and splitting in half.

Question 16

Which of the following equations best represents the exponential growth of a bacterial population by binary fission, where $$N is $$the final number of cells, $$N_0 is $$the initial number of cells, and $$n is $$the number of generations?

Accepted Answer

$$N = N_0$ 	imes 2^n$$

Question 17

A researcher is studying a microorganism that is unicellular, lacks a nucleus, and has a cell wall containing peptidoglycan. Which group does this organism belong to?

Accepted Answer

Bacteria

Question 18

Which of the following is a plausible reason why biofilms are often resistant to antibiotics?

Accepted Answer

The extracellular matrix of biofilms limits the penetration of antibiotics and allows for the exchange of resistance genes.

Question 19

Which of the following is an example of a microorganism used in the production of a chemical product for disease treatment?

Accepted Answer

Penicillium fungus used to produce penicillin.

Question 20

Which of the following best describes the function of Bacillus thuringiensis in agriculture?

Accepted Answer

It is used as a biological pesticide because its toxins are fatal to many insects but harmless to animals and plants.

Chapter 1: The Microbial World and You – Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard