CR Biology B Module 2 Lesson 6
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Questions and Answers

What characteristic distinguishes Salmonella from other organisms?

  • They contain a nucleus.
  • They are multicellular.
  • They can survive without any nutrients.
  • They are unicellular. (correct)

    • How do bacteria contribute to the carbon and nitrogen cycles?

  • By producing harmful toxins.
  • By consuming essential nutrients.
  • By decomposing waste material. (correct)
  • By competing with plants for resources.

    • Which of the following is a beneficial use of bacteria in human applications?

  • Producing radioactive waste.
  • Causing food spoilage.
  • Creating antibiotics. (correct)
  • Generating harmful pollutants.

    • What type of respiration do bacteria use during fermentation?

    <p>Anaerobic respiration.</p> Signup and view all the answers

    What is the primary role of bacteria in the human intestines?

    <p>To aid in digestion and vitamin production.</p> Signup and view all the answers

    Which of the following diseases is NOT caused by bacteria?

    <p>Influenza.</p> Signup and view all the answers

    What factor contributes to the spread of bacterial diseases?

    <p>Direct transmission between individuals.</p> Signup and view all the answers

    What is the primary mode of transmission for the Ebola virus?

    <p>Direct contact with infected body fluids</p> Signup and view all the answers

    Which of the following viruses is noted for its potential to cause a new influenza pandemic?

    <p>H5N1 avian flu virus</p> Signup and view all the answers

    What is known about the transmission of the H5N1 virus among humans?

    <p>It has not mutated to spread easily among humans.</p> Signup and view all the answers

    What factor significantly contributed to the media attention surrounding Ebola outbreaks?

    <p>The high mortality rate associated with different strains.</p> Signup and view all the answers

    What has been identified as the primary hosts for both the Ebola virus and Marburg virus?

    <p>Apes and bats in west central Africa</p> Signup and view all the answers

    What is the primary function of a vector in the context of disease transmission?

    <p>To spread pathogens from one host to another</p> Signup and view all the answers

    Which of the following methods is NOT effective in controlling bacteria in food or water?

    <p>Freezing at low temperatures</p> Signup and view all the answers

    What characterizes viruses that enter a latent state in the body?

    <p>They remain dormant and can re-emerge later</p> Signup and view all the answers

    What is a primary consequence of the misuse and overuse of antibiotics?

    <p>Development of antibiotic resistance in bacteria</p> Signup and view all the answers

    What is the definition of a pandemic?

    <p>A disease affecting people in multiple countries simultaneously</p> Signup and view all the answers

    Which of the following diseases is caused by a virus that can lead to cancer?

    <p>Human papillomavirus (HPV)</p> Signup and view all the answers

    Which of the following pathogens is primarily spread by ticks?

    <p>Bacteria causing Lyme disease</p> Signup and view all the answers

    What role do epidemiologists play in disease outbreaks?

    <p>They investigate the causes of outbreaks</p> Signup and view all the answers

    What condition does the herpes virus cause after remaining dormant post chickenpox infection?

    <p>Shingles</p> Signup and view all the answers

    How does the influenza virus typically spread across populations?

    <p>Through seasonal epidemics among humans</p> Signup and view all the answers

    Bacteria like Salmonella consist of multiple cells with a nucleus.

    <p>False</p> Signup and view all the answers

    Most bacteria living in or on the human body are harmful to humans.

    <p>False</p> Signup and view all the answers

    Fermentation is a type of respiration that requires oxygen.

    <p>False</p> Signup and view all the answers

    Bacteria play a crucial role in the carbon and nitrogen cycles.

    <p>True</p> Signup and view all the answers

    Gene therapy utilizes bacteria to transfer normal genes to human cells.

    <p>True</p> Signup and view all the answers

    Insects are the most common vectors of human diseases.

    <p>True</p> Signup and view all the answers

    Bacterial infections can always be treated effectively with vaccines.

    <p>False</p> Signup and view all the answers

    Antibiotic resistance in bacteria can occur due to the misuse and overuse of antibiotics.

    <p>True</p> Signup and view all the answers

    Zoonosis refers to diseases that can be spread from humans to animals.

    <p>False</p> Signup and view all the answers

    Shingles is caused by a virus that is different from the one that causes chicken pox.

    <p>False</p> Signup and view all the answers

    Study Notes

    Bacteria Overview

    • Bacteria are the most abundant organisms on Earth, primarily single-celled and lacking a nucleus.
    • Salmonella is a notable bacterium that causes food poisoning and other diseases in humans.
    • While some bacteria are harmful, many are essential for human survival, residing within our bodies.

    Benefits of Bacteria

    • Bacteria play crucial roles in various ecosystems, serving as decomposers and contributing to the carbon and nitrogen cycles.
    • Billions of bacteria in the human intestines assist in digestion and vitamin production.
    • Key human uses of bacteria include:
      • Production of ethanol and enzymes.
      • Development of antibiotics and vaccines.
      • Creation of methane through biogas.
      • Bioremediation of oil spills and toxic waste.
      • Pest control in plants.
      • Gene therapy applications.
      • Fermentation for various foods like yogurt and sauerkraut.

    Bacteria and Disease

    • The human body contains ten times more bacterial cells than human cells, mostly harmless.
    • Bacterial diseases include tetanus, syphilis, and food poisoning, often spreading by direct contact, contaminated food/water, or vectors like insects.
    • Vectors such as ticks are responsible for transmitting diseases like Lyme disease.

    Controlling Bacteria

    • High temperatures (at least 74°C or 165°F) can kill bacteria in food and water.
    • Surfaces can be disinfected using bleach or other agents to eliminate bacteria.
    • Antibiotics can effectively treat bacterial infections, but misuse has led to antibiotic resistance in many strains.

    Viruses Overview

    • Viruses also cause a range of diseases, including influenza, HIV, rabies, and more.
    • They can harm host cells by causing them to burst or disrupt their normal functions.
    • Some viruses, like those that cause chickenpox, can remain dormant and reactivate later as shingles.

    Influenza

    • Influenza is a contagious respiratory illness, causing seasonal epidemics and significant hospitalization rates annually in the U.S.
    • Influenza pandemics throughout the 20th century resulted in millions of deaths.

    Emerging Viral Diseases

    • Modern transportation enables rapid spread of diseases, including zoonotic diseases that jump from animals to humans.
    • Epidemiologists investigate outbreaks to prevent future occurrences, comparing their work to detective investigations.
    • Examples of emergent viral threats include H5N1 avian flu, Ebola virus, and novel coronaviruses like SARS-CoV-2 (COVID-19).

    Summary of Key Points

    • Bacteria are important for ecological balance and human health but can also lead to disease.
    • Antibiotics are vital for treating bacterial infections but face challenges from resistance.
    • Viruses vary in severity, with several presenting new health threats in the modern era, not treatable with antibiotics and requiring preventive measures like vaccines.

    Bacteria Overview

    • Bacteria are the most abundant organisms on Earth, primarily single-celled and lacking a nucleus.
    • Salmonella is a notable bacterium that causes food poisoning and other diseases in humans.
    • While some bacteria are harmful, many are essential for human survival, residing within our bodies.

    Benefits of Bacteria

    • Bacteria play crucial roles in various ecosystems, serving as decomposers and contributing to the carbon and nitrogen cycles.
    • Billions of bacteria in the human intestines assist in digestion and vitamin production.
    • Key human uses of bacteria include:
      • Production of ethanol and enzymes.
      • Development of antibiotics and vaccines.
      • Creation of methane through biogas.
      • Bioremediation of oil spills and toxic waste.
      • Pest control in plants.
      • Gene therapy applications.
      • Fermentation for various foods like yogurt and sauerkraut.

    Bacteria and Disease

    • The human body contains ten times more bacterial cells than human cells, mostly harmless.
    • Bacterial diseases include tetanus, syphilis, and food poisoning, often spreading by direct contact, contaminated food/water, or vectors like insects.
    • Vectors such as ticks are responsible for transmitting diseases like Lyme disease.

    Controlling Bacteria

    • High temperatures (at least 74°C or 165°F) can kill bacteria in food and water.
    • Surfaces can be disinfected using bleach or other agents to eliminate bacteria.
    • Antibiotics can effectively treat bacterial infections, but misuse has led to antibiotic resistance in many strains.

    Viruses Overview

    • Viruses also cause a range of diseases, including influenza, HIV, rabies, and more.
    • They can harm host cells by causing them to burst or disrupt their normal functions.
    • Some viruses, like those that cause chickenpox, can remain dormant and reactivate later as shingles.

    Influenza

    • Influenza is a contagious respiratory illness, causing seasonal epidemics and significant hospitalization rates annually in the U.S.
    • Influenza pandemics throughout the 20th century resulted in millions of deaths.

    Emerging Viral Diseases

    • Modern transportation enables rapid spread of diseases, including zoonotic diseases that jump from animals to humans.
    • Epidemiologists investigate outbreaks to prevent future occurrences, comparing their work to detective investigations.
    • Examples of emergent viral threats include H5N1 avian flu, Ebola virus, and novel coronaviruses like SARS-CoV-2 (COVID-19).

    Summary of Key Points

    • Bacteria are important for ecological balance and human health but can also lead to disease.
    • Antibiotics are vital for treating bacterial infections but face challenges from resistance.
    • Viruses vary in severity, with several presenting new health threats in the modern era, not treatable with antibiotics and requiring preventive measures like vaccines.

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    Description

    This quiz explores the fascinating world of bacteria, including their roles in ecosystems and benefits to humans. Learn about both the harmful and essential functions of bacteria, such as digestion, production of antibiotics, and their applications in various industries. Test your knowledge on the impact bacteria have on our health and environment.

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