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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