(MC3) CHAPTER 1

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Questions and Answers

Which of the following best describes Thucydides' contribution to the understanding of disease?

  • He proposed that invisible creatures cause diseases.
  • He invented the microscope, enabling the observation of microbes.
  • He observed that survivors of a disease do not get re-infected, showing early understanding of immunity. (correct)
  • He demonstrated that fermentation is caused by microorganisms.

What was Marcus Terentius Varro's theory concerning the cause of diseases?

  • Disease was caused by visible creatures in swamps.
  • Disease was caused by imbalances in the environment.
  • Disease was caused by imbalances in the four humors.
  • Disease was caused by minute creatures that could not be seen by the eye. (correct)

What did Antonie van Leeuwenhoek observe using his powerful lens?

  • He observed single-celled organisms, which he called 'animalcules'. (correct)
  • He observed the fermentation process.
  • He observed how minute creatures float in the air.
  • He observed the process of immunity in disease survivors.

What term did Leeuwenhoek use to describe the microorganisms he observed?

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

Which of the following is NOT a contribution of Louis Pasteur to microbiology?

<p>Observed single-celled organisms using a microscope. (A)</p> Signup and view all the answers

What did Thucydides say about the Athenian plague?

<p>Survivors did not get re-infected. (D)</p> Signup and view all the answers

During what historical period did Leeuwenhoek make his significant contributions to microbiology?

<p>The Early Enlightenment Period (C)</p> Signup and view all the answers

Who proposed the existence of microorganisms before proof from the microscope?

<p>Marcus Terentius Varro (C)</p> Signup and view all the answers

What is the primary reason for the replacement of Bunsen burners with infrared microincinerators in many labs?

<p>To eliminate the risk of open flames. (A)</p> Signup and view all the answers

What is the main function of an inoculation loop in a laboratory setting?

<p>To transfer or streak microorganisms. (C)</p> Signup and view all the answers

Why is it crucial to sterilize an inoculation loop before each use?

<p>To prevent contamination of cultures. (D)</p> Signup and view all the answers

What is the definition of taxonomy?

<p>The system of naming and classifying organisms. (D)</p> Signup and view all the answers

Who is recognized as the most famous early taxonomist mentioned in the text?

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

What was the main contribution of Linnaeus's Systema Naturae?

<p>Creating a standardized system for naming and categorizing organisms. (D)</p> Signup and view all the answers

Initially, how were evolutionary relationships depicted in early phylogenetic trees?

<p>By considering their visible characteristics. (D)</p> Signup and view all the answers

In Linnaeus's original taxonomic system, the levels included kingdom, class, order, family, and what other taxonomic ranks?

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

What therapeutic use is associated with the fungus mentioned in the text?

<p>Laxative and antibiotic properties (C)</p> Signup and view all the answers

How did Ötzi's tattoos differ from modern tattooing methods?

<p>They involved cutting the skin, filling with herbs, and burning rather than using ink. (D)</p> Signup and view all the answers

The practice of quarantining individuals with leprosy, mentioned in the Bible, suggests what ancient understanding?

<p>Some diseases can be transmitted from person to person. (D)</p> Signup and view all the answers

What did the ancient Greeks believe to be the cause of disease, as described in the text?

<p>Miasmatic odors, or bad air, which they called mal’aria. (D)</p> Signup and view all the answers

What infrastructure advancements did the Romans implement based on their belief in the miasma hypothesis?

<p>A system of aqueducts and a giant sewer, Cloaca Maxima. (B)</p> Signup and view all the answers

Which of the following best describes Hippocrates' contribution to medicine?

<p>He dismissed supernatural causes of disease, suggesting natural causes from within people or their environment. (A)</p> Signup and view all the answers

The Hippocratic Oath primarily represents which of the following?

<p>A dedication to diagnosing and treating patients without causing harm. (D)</p> Signup and view all the answers

What is meant by the term 'Hippocratic Corpus', mentioned in the text?

<p>A compilation of medical texts believed to be written by Hippocrates and his followers. (D)</p> Signup and view all the answers

In what year were there only 126 reported cases of guinea worm disease?

<p>2014 (D)</p> Signup and view all the answers

Which of the following best describes a virus?

<p>An acellular entity containing either DNA or RNA (D)</p> Signup and view all the answers

A microbiologist who studies fungi is considered a:

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

Which subfield of microbiology focuses on the study of helminths?

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

Which of these represents an area of focus for microbiologists within a specific field?

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

What is a key difference between archaeal and bacterial cell walls?

<p>Archaea cell walls contain pseudopeptidoglycan, while bacterial cell walls contain peptidoglycan. (C)</p> Signup and view all the answers

Which of the following is NOT considered a defining characteristic of eukaryotes?

<p>Ability to form multicellular organisms. (D)</p> Signup and view all the answers

Which of the following describes algae?

<p>They are eukaryotic organisms that can be unicellular or multicellular with cell walls made of cellulose. (B)</p> Signup and view all the answers

What crucial role do algae play in many ecosystems?

<p>They are photosynthetic and release oxygen and carbohydrates into their environment. (B)</p> Signup and view all the answers

Which of the following is a product derived from algae used in consumer products?

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

What role is being explored for algae beyond their current uses?

<p>As a possible source for biofuels. (B)</p> Signup and view all the answers

How do some protozoa move?

<p>With hair-like structures called cilia or whip-like structures called flagella. (C)</p> Signup and view all the answers

Although archaea can live in many different environments, which of the following is a known fact about archaea?

<p>None have been shown to be human pathogens. (D)</p> Signup and view all the answers

What are pseudopods?

<p>Cytoplasmic extensions used by some protozoa. (B)</p> Signup and view all the answers

Which of the following characteristics is unique to fungi, compared to protozoa?

<p>Having cell walls made of chitin. (D)</p> Signup and view all the answers

Why are helminths included in the study of microbiology?

<p>Their diseases involve microscopic eggs and larvae. (C)</p> Signup and view all the answers

Which of these is a beneficial use of yeast?

<p>Causing bread to rise and beverages to ferment. (C)</p> Signup and view all the answers

What makes molds differ from plants?

<p>Molds are not photosynthetic. (D)</p> Signup and view all the answers

What is a defining characteristic of a parasitic organism?

<p>It is able to survive by extracting nutrients from a host. (B)</p> Signup and view all the answers

Which of the following is a disease caused by a helminth described in the text?

<p>Guinea worm infection. (A)</p> Signup and view all the answers

What role do molds play in the environment?

<p>They are critical in the decomposition of dead plants and animals. (B)</p> Signup and view all the answers

Flashcards

Laxative and antibiotic fungus

A type of fungus that can both relieve constipation and fight infections.

Miasma Hypothesis

The belief that disease is caused by bad air or harmful vapors.

Roman sanitation infrastructure

A system designed to manage waste and provide clean water.

Contagion

The concept that diseases can be transmitted through invisible agents.

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Quarantine

The practice of isolating individuals with diseases to prevent further spread.

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Hippocrates' theory of disease

The idea that diseases have natural causes, not supernatural forces.

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Hippocratic Corpus

A collection of ancient medical texts attributed to Hippocrates.

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Hippocratic Oath

An oath taken by physicians to provide ethical and harmless care.

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Immunity

The ability of an organism to resist a particular disease or infection.

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Thucydides

A Greek historian considered the "father of scientific history" who advocated for evidence-based analysis. He observed that survivors of the Athenian plague did not get re-infected, indicating early understanding of immunity.

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Marcus Terentius Varro

A Roman writer who first proposed the idea that unseen organisms (microorganisms) can cause disease.

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Antonie van Leeuwenhoek

A Dutch cloth merchant who was the first to develop a lens powerful enough to see microbes. He observed single-celled organisms using a simple microscope.

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Golden Age of Microbiology

A period of significant advancements in the understanding of microbes, marked by the work of Louis Pasteur and Robert Koch.

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Louis Pasteur

A French chemist who proved that fermentation is caused by microorganisms and demonstrated unique properties of microbial strains.

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Robert Koch

A German physician who established the germ theory of disease by identifying the specific microbes causing anthrax and tuberculosis.

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Germ theory of disease

The theory that specific diseases are caused by specific microbes.

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Inoculation loop

A tool with a wire loop used for transferring microorganisms between surfaces, such as agar plates and test tubes.

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Taxonomy

The branch of biology that classifies, describes, names, and identifies living organisms.

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Carolus Linnaeus

Swedish botanist, zoologist, and physician known as the "father of taxonomy." He established a hierarchical system for classifying organisms.

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Phylogenetic tree

A diagram representing the evolutionary relationships among different species or groups of organisms.

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Classification

The process of arranging organisms into different groups based on shared characteristics.

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Species

The most specific level of classification in Linnaeus's system, representing a group of organisms that can interbreed and produce fertile offspring.

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Linnaeus's Taxonomy Hierarchy

Linnaeus's original taxonomy system, organized into a hierarchy of levels, with each level becoming more specific based on shared characteristics.

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Phylogeny

The study of evolutionary relationships among organisms, often depicted using phylogenetic trees.

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Virology

The study of viruses, which are acellular microorganisms that require a host to reproduce.

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Immunology

A subfield of microbiology that focuses on the immune system and its role in fighting off infections.

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Environmental Microbiology

Specialized branch of microbiology that examines the microorganisms found in various environments, such as soil, water, and air.

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Bacteriology

A subfield of microbiology dedicated to the study of bacteria, often considered one of the oldest and most diverse microbial groups.

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Mycology

The study of fungi, a diverse kingdom of organisms that includes mushrooms, yeasts, and molds.

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What are Archaea?

Archaea are a domain of single-celled organisms that differ from bacteria in their genetics, metabolism, and cell structure.

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What's different about Archaea cell walls?

Archaea lack peptidoglycan in their cell walls, unlike bacteria. Instead, they often have a similar substance called pseudopeptidoglycan.

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What is the domain Eukarya?

Eukarya is the domain that includes all organisms with cells containing a nucleus. This includes diverse groups like protists, fungi, plants, and animals.

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What are protists?

Protists are a diverse group of eukaryotic organisms that are not classified as plants, animals, or fungi.

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What are algae?

Algae are protists that can be single-celled or multicellular and vary in appearance and environment. They're photosynthetic and produce oxygen and carbohydrates.

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What are protozoa?

Protozoa are protists that are essential to many food webs. They're diverse and can move using cilia, flagella, or extending their cell membrane and cytoplasm.

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How are algae used?

Algae are used in various products like ice cream, salad dressing, and toothpaste. Some algae are being researched as potential biofuel sources.

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Why are protozoa important?

Protozoa are important for nutrient cycling in many ecosystems. They play a role in providing food for other organisms.

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Pseudopods

Cytoplasmic extensions of some protozoa that resemble false feet.

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Protozoa

Microscopic, single-celled eukaryotic organisms that are diverse in their characteristics and ecological roles.

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Parasitic protozoa

Protozoans that obtain nutrients from a host organism, often causing harm.

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Fungi

Eukaryotic organisms including mushrooms, yeasts, and molds.

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Yeasts

Unicellular fungi that can be beneficial or harmful.

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Molds

Multicellular fungi that form visible colonies, often found in damp environments.

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Helminths

Multicellular parasitic worms whose diseases are studied in microbiology because they involve microscopic stages.

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Guinea worm

A type of helminth that causes painful ulcers and other symptoms by migrating out of the skin.

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Study Notes

Introduction to Microbiology

  • Microorganisms (microbes) are small organisms found everywhere on Earth.
  • Many microbes are harmless and essential for ecosystems.
  • Microbes are vital in food, medicine, and biofuels.
  • Knowledge of microbes is constantly expanding.

Ancestor's Knowledge of Microbes

  • Before microscopes, people had some idea of microorganisms.
  • Humans have used fermentation to create foods and beverages (beer, wine, bread, yogurt, cheese).
  • The practice of quarantining those with diseases hints at the understanding of communicable illnesses.
  • The development of sanitation systems reflects early knowledge of disease transmission.
  • Early ideas of microbial involvement in disease existed, though not always accurately understood.
  • Some civilizations even attempted to treat illnesses with herbs and other substances.

The Iceman Ötzi

  • Ötzi (an early human mummy) was found with evidence of infections from parasites and bacteria in his system.
  • His preserved state showed some attempt to treat illness through tattoos, using herbs, and other substances.
  • This demonstrates that the concept of treating disease with natural remedies existed thousands of years ago.

Early Notions of Disease and Contagion

  • Ancient civilizations recognized the notion of contagious diseases and implemented methods like isolation.
  • The Bible describes quarantine practices for people with leprosy.
  • Ancient Greek thinking, focusing on "miasma," recognized air quality as a factor in disease.
  • Rome's advanced sewage and water systems, while seemingly unrelated, show a pragmatic appreciation for managing disease transmission.

Birth of Microbiology

  • Antonie van Leeuwenhoek developed powerful microscopes to observe microbes, providing definitive proof of their existence.
  • Louis Pasteur demonstrated the role of microorganisms in fermentation, and developed vaccines.
  • Robert Koch established the link between specific microbes and diseases (e.g., anthrax, cholera).
  • Advancements in microbiological tools, such as microscopes, stains, media, and Petri dishes, allowed researchers to study microbes better and understand their properties further.

Types of Microorganisms

  • Prokaryotes: Bacteria and Archaea (lack a nucleus).
  • Eukaryotes: Fungi (molds, yeasts), protists (algae, protozoa), and helminths (multicellular parasites).
  • Bacteria: Diverse shapes (cocci, bacilli, spirilla), various metabolic capabilities.
  • Archaea: Live in extreme environments, unique cell wall structure, distinct metabolism.
  • Protists: Found in various habitats, diverse form, often photosynthetic.
  • Fungi: Unicellular (yeasts) or multicellular (molds), non-photosynthetic.
  • Helminths: Multicellular parasitic worms, often involving microscopic stages within the host.

Classification and Taxonomy

  • Taxonomy is organizing & naming living organisms into groups based on shared traits.
  • Carolus Linnaeus's hierarchical system (kingdom, phylum, etc.).
  • Evolutionary relationships (phylogenies) are represented through phylogenetic trees.
  • Modern taxonomy increasingly relies on comparative genetics, providing a more comprehensive view of evolutionary connections and relationships among all living things.
  • Modern taxonomy helps researchers understand the close relationships and differences between organisms more accurately and efficiently.

Microbiology as a Field of Study

  • Sub-disciplines (bacteriology, mycology, virology, parasitology).
  • The study of the immune system (immunology).
  • Clinical microbiology focusing on disease-causing microbes directly.
  • Environmental, applied, and food microbiology studying microbes' roles in various environments.

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