Food Storage: Relative Humidity and Gas Concentration
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Questions and Answers

What role does the bacterial capsule play?

  • Prevents the bacterium from drying out
  • Serves as a virulence factor
  • Mediates adherence of cells to surfaces
  • All of the above (correct)

What is the function of flagella in bacteria?

  • Help in biofilm formation
  • Contain genetic information
  • Protect against antimicrobial agents
  • Serve as propellers for movement (correct)

Which structure contains the bacterium's genetic information?

  • Flagella
  • Cell wall
  • Chromosome (correct)
  • Cytoplasm

Which component forms the outer layer of the bacterial cell envelope?

<p>Cell wall (C)</p> Signup and view all the answers

What is the main function of the cytoplasm in bacteria?

<p>Metabolism and replication (D)</p> Signup and view all the answers

Which structural component is crucial for genetic fingerprinting in bacteria?

<p>Chromosome (A)</p> Signup and view all the answers

What is the primary focus of food microbiology?

<p>Understanding microorganisms in raw and processed food (A)</p> Signup and view all the answers

Which microorganism is the most abundant in nature according to the text?

<p>Bacteria (B)</p> Signup and view all the answers

Why are pathogens in food products a major concern?

<p>They result in public health issues and illnesses (B)</p> Signup and view all the answers

How do bacterial cells reproduce under favorable conditions?

<p>By dividing at a constant rate (A)</p> Signup and view all the answers

What defines food microbiology as a science?

<p>Examination of bacteria and viruses in food (B)</p> Signup and view all the answers

What is the primary atmospheric gas used to control microorganisms in foods?

<p>Carbon dioxide (CO2) (C)</p> Signup and view all the answers

What is the generation time of bacterial cells mentioned in the text?

<p>$30$ minutes (D)</p> Signup and view all the answers

What are some substances produced by foodborne organisms that can inhibit or kill other microorganisms?

<p>Bacteriocins (C)</p> Signup and view all the answers

What is the phenomenon called when one microorganism inhibits or destroys another nonspecifically in the same environment?

<p>General microbial interference (C)</p> Signup and view all the answers

What role does relative humidity play in food storage environments?

<p>It influences water activity (aw) within foods (C)</p> Signup and view all the answers

In modified-atmosphere packaging of foods, what gas can be used effectively due to its ability to control microorganisms?

<p>Carbon dioxide (CO2) (B)</p> Signup and view all the answers

From a regulatory perspective, what is identified as the main source of food contamination in meat and poultry?

<p>Bacteria (C)</p> Signup and view all the answers

Which of the following is a source of bacterial contamination for food handlers?

<p>Hands and outer garments (D)</p> Signup and view all the answers

Which bacterial genus mentioned in the text can survive in the environment?

<p>Listeria (B)</p> Signup and view all the answers

What is a common location where bacteria may contaminate food utensils during slaughter and processing operations?

<p>Mixers (C)</p> Signup and view all the answers

What contributes significantly to the contamination of vegetables and fruits?

<p>Soil and water organisms (C)</p> Signup and view all the answers

Which factor plays a major role in the transfer of pathogenic agents between countries according to the text?

<p>Globalization of food supply (C)</p> Signup and view all the answers

Which of the following is NOT mentioned as a possible source of bacterial contamination in food products?

<p>Air (A)</p> Signup and view all the answers

What poses a risk of introducing pathogens to a country, as mentioned in the text?

<p>International travel (C)</p> Signup and view all the answers

What is a known source of Listeria monocytogenes to dairy and meat animals according to the text?

<p>Animal feeds (A)</p> Signup and view all the answers

Which of the following organisms is NOT listed as a notable pathogen found in the intestinal biota according to the text?

<p>Listeria (A)</p> Signup and view all the answers

What is identified as a primary source for E.coli, Salmonella, and Listeria in the text?

<p>Animal hides (C)</p> Signup and view all the answers

Which of the following is NOT mentioned as an example of bacteria found in soil and water that may contaminate food?

<p>Listeria (B)</p> Signup and view all the answers

Where are salmonellae carried to poultry and other farm animals from?

<p>Animal feeds (D)</p> Signup and view all the answers

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