Microbiology Basics Quiz
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Questions and Answers

Which of the following is NOT a characteristic of prokaryotic cells?

  • They have a well-defined nucleus. (correct)
  • They lack a membrane-bound nucleus.
  • They have a cell wall.
  • They contain ribosomes.
  • What is the primary function of a bacterial flagellum?

  • Adherence to surfaces.
  • Secretion of waste products.
  • Movement in liquid environments. (correct)
  • Synthesis of proteins.
  • Which type of bacteria obtains energy from chemical processes?

  • Chemosynthetic bacteria (correct)
  • Parasitic bacteria
  • Photosynthetic bacteria
  • Saprotrophic bacteria
  • Which type of bacteria plays a crucial role in decomposition?

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

    What is the name of the process by which bacteria reproduce?

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

    Which of the following terms describes an organism that feeds on dead or decaying tissues of other organisms?

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

    Under what conditions do bacteria form endospores?

    <p>Unfavorable conditions like lack of food or extreme heat (C)</p> Signup and view all the answers

    Which of the following is a tough, protective structure found in bacteria that allows them to survive unfavorable conditions?

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

    Which of the following is NOT a characteristic of protists?

    <p>They are primarily multicellular. (A)</p> Signup and view all the answers

    What is the primary function of a plasmid in a bacterial cell?

    <p>Storage of genetic information (C)</p> Signup and view all the answers

    What is the main reason protists are not classified into the plant, animal, or fungi kingdoms?

    <p>They share characteristics with multiple kingdoms. (D)</p> Signup and view all the answers

    Which bacterial shape is described as a comma-shaped structure?

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

    What is the term used to describe an organism that lives off of dead organic matter?

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

    Which of the following is NOT a characteristic of all bacterial cells?

    <p>Membrane-bound organelles (B)</p> Signup and view all the answers

    A bacterium divides into two identical daughter cells. What is this process called?

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

    Which of these processes is NOT directly involved in the nitrogen cycle?

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

    What is the primary role of bacteria and fungi in the environment?

    <p>Breaking down dead organic matter (C)</p> Signup and view all the answers

    Which of the following is a true statement about bacteria?

    <p>Bacteria are larger than viruses and can be seen using a light microscope. (D)</p> Signup and view all the answers

    Which type of organism is responsible for converting atmospheric nitrogen into ammonia and nitrates?

    <p>Free-living bacteria (D)</p> Signup and view all the answers

    Which of the following is NOT a type of bacterial shape?

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

    What is a symbiotic relationship?

    <p>All of the above (D)</p> Signup and view all the answers

    Which statement best describes the role of autotrophic bacteria in the environment?

    <p>They provide nutrients to other organisms (C)</p> Signup and view all the answers

    Which of these is NOT a characteristic of decomposers?

    <p>They can only obtain energy from living organisms (D)</p> Signup and view all the answers

    What is the process by which de-nitrifying bacteria return nitrogen to the atmosphere?

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

    What is the mode of nutrition for phytoplankton?

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

    Which of the following is NOT a characteristic of fungi?

    <p>Fungi are always multicellular organisms. (B)</p> Signup and view all the answers

    Which of the following best describes the role of hyphae in fungi?

    <p>Hyphae are the thread-like structures that make up the fungal body. (A)</p> Signup and view all the answers

    Why are viruses not classified into any of the five kingdoms?

    <p>Viruses are not considered to be living organisms. (B)</p> Signup and view all the answers

    Which of the following is a characteristic that distinguishes fungi from algae?

    <p>Algae have cell walls made of cellulose while fungi have cell walls made of chitin. (D)</p> Signup and view all the answers

    What is the independent variable in the bread mold experiment?

    <p>The temperature of the environment (B)</p> Signup and view all the answers

    Which of the following would NOT be a plausible hypothesis for the bread mold experiment?

    <p>Bread mold will not grow in the refrigerator. (A)</p> Signup and view all the answers

    What is the most likely reason the bread mold grew most on the window sill?

    <p>The window sill was the warmest environment. (A)</p> Signup and view all the answers

    Which of the following best describes the relationship between mycorrhizal fungi and plant roots?

    <p>Mutualism, where both the fungi and the plant benefit. (A)</p> Signup and view all the answers

    Which of these forms of nitrogen are directly usable by plants?

    <p>Nitrate ($NO_3^-$) (A)</p> Signup and view all the answers

    The presence of mycorrhizal fungi in the soil would most likely have which of the following effects on plant growth?

    <p>Increased root growth and increased nutrient uptake. (B)</p> Signup and view all the answers

    Which of the following best describes the role of bacteria in the nitrogen cycle?

    <p>Converting atmospheric nitrogen gas ($N_2$) into a usable form for plants. (A)</p> Signup and view all the answers

    What is the primary benefit that humans derive from their symbiotic relationship with E. coli bacteria in their gut?

    <p>Production of essential vitamins, such as vitamin K. (C)</p> Signup and view all the answers

    In the symbiotic relationship between a fungus and an alga, which organism provides protection from the environment?

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

    Identify the type of symbiosis that describes the relationship between nitrogen-fixing bacteria and leguminous plants.

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

    What is the primary source of nitrates for plants?

    <p>Nitrogen-fixing bacteria (B)</p> Signup and view all the answers

    Which of the following is a characteristic of all ruminants?

    <p>They are herbivores that digest food in a specialized four-chambered stomach (A)</p> Signup and view all the answers

    What is the primary role of algae in a lichen?

    <p>Providing food for the fungus (B)</p> Signup and view all the answers

    Which of these statements accurately describes the relationship between E. coli and humans?

    <p>E. coli is only harmful under specific conditions. (C)</p> Signup and view all the answers

    Which symbiotic relationship involves one organism benefiting while the other is unharmed?

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

    Which type of symbiosis is exemplified by a tapeworm inhabiting the intestines of a human?

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

    Flashcards

    Nucleoid

    The irregular loop of DNA in prokaryotic cells, lacking a membrane.

    Prokaryotic

    Cells without a membrane-bound nucleus, like bacteria.

    Plasmid

    A small, circular, double-stranded DNA molecule found in bacteria's cytoplasm.

    Flagellum

    A whip-like structure used by bacteria for movement in liquid.

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    Autotrophic bacteria

    Bacteria that create their own food using sunlight or chemicals.

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    Heterotrophic bacteria

    Bacteria that cannot make their own food and depend on others.

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    Binary fission

    Simple cell division process bacteria use to reproduce rapidly.

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    Endospores

    Survival structures formed by bacteria in unfavorable conditions.

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    Saprophytic

    Organisms that feed on decaying tissues of other organisms.

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    Bacterial Shapes

    Bacteria are classified by shapes like cocci, bacilli, spirilla, and vibrio.

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    Cell Wall

    A structural layer made of polysaccharides surrounding bacterial cells.

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    Cytoplasm

    Gel-like substance within a bacterial cell, surrounded by the cell membrane.

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    Slime Capsule

    A protective layer some bacteria have to prevent drying out.

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    Chitin

    A tough, protective polysaccharide found in fungal cell walls.

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    Hyphae

    Filamentous structures that make up the bodies of multicellular fungi.

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    Mycelium

    A mass of hyphae that forms the main body of a fungus.

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    Asexual reproduction in yeasts

    Budding is the method by which unicellular fungi reproduce asexually.

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    Multicellular fungal spores

    Reproductive cells that allow multicellular fungi to reproduce asexually.

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    Five kingdoms of life

    The classification system that includes Monera, Protista, Fungi, Plantae, Animalia.

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    Dependent variable

    The factor measured in an experiment, affected by the independent variable.

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    Independent variable

    The factor manipulated to observe its effect on the dependent variable.

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    E.coli

    Bacteria in the gut that aid digestion and produce vitamin K.

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    Mutualistic bacteria

    Bacteria that help digest cellulose in ruminants and termites.

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    Mycorrhiza

    Fungi that interact with plant roots to enhance nutrient absorption.

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    Nitrogen fixation

    Process by which nitrogen gas is converted into usable compounds for plants.

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    Symbiosis

    A close interaction between two different biological organisms.

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    Decomposers

    Organisms like bacteria and fungi that break down dead organic material.

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    Role of Micro-organisms

    They recycle living materials and maintain environmental balance.

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    Nitrogen Cycle

    Process where bacteria convert atmospheric nitrogen into usable forms for plants.

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    Denitrification

    Process where denitrifying bacteria return nitrogen to the atmosphere.

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    Symbiotic Relationships

    Interactions between different species that can be beneficial or harmful.

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    Producers in Food Chains

    Organisms like autotrophic bacteria and phytoplankton that form the base of food chains.

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    Mutualism

    A symbiotic relationship where both organisms benefit.

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    Commensalism

    A symbiotic relationship where one organism benefits while the other is neither helped nor harmed.

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    Parasitism

    A symbiotic relationship where one organism benefits at the expense of the other.

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    Lichens

    Composite organisms made up of fungi growing symbiotically with algae or cyanobacteria.

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    Ruminant

    Even-toed mammals that chew the cud regurgitated from their rumen.

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    Nitrogen-fixing bacteria

    Bacteria that convert free nitrogen in the atmosphere into nitrates for plant use.

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    Escherichia coli (E. coli)

    A type of mutualistic bacteria found in the human intestine that aids in digestion.

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