Microbiology: Bacteria, Fungi, and Ecology

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Questions and Answers

Which structural component is primarily responsible for differentiating Gram-positive from Gram-negative bacteria?

  • The presence or absence of plasmids.
  • The type of ribosomes found within the cytoplasm.
  • The thickness and composition of the peptidoglycan layer in the cell wall. (correct)
  • The presence or absence of a nucleus.

How does the cell wall composition of fungi differ significantly from that of bacteria?

  • Fungal cell walls contain peptidoglycan, while bacterial cell walls contain chitin.
  • Fungal cell walls contain cellulose, while bacterial cell walls contain chitin.
  • Fungal cell walls contain chitin, while bacterial cell walls contain peptidoglycan. (correct)
  • Fungal cell walls lack a defined structure, while bacterial cell walls are rigid.

In anaerobic respiration, what role do inorganic compounds play?

  • They serve as the final electron acceptor in the electron transport chain. (correct)
  • They enhance the rate of ATP synthesis in the cytoplasm.
  • They facilitate the breakdown of glucose during glycolysis.
  • They act as the initial carbon source for energy production.

Which type of ecological interaction is exemplified by nitrogen-fixing bacteria in the roots of plants?

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

How can understanding the microbial communities associated with totora plants contribute to bioremediation efforts in contaminated wetlands?

<p>By identifying microbes capable of degrading pollutants, thus cleaning the water. (C)</p> Signup and view all the answers

A researcher isolates a novel enzyme from a fungus found in a totora ecosystem. What is a potential industrial application of this enzyme?

<p>For producing biofuels from plant biomass. (C)</p> Signup and view all the answers

What role do pili play in bacterial cells?

<p>Facilitating adhesion to surfaces and the transfer of genetic material during conjugation. (C)</p> Signup and view all the answers

What is the primary function of the capsule found in some bacterial cells?

<p>To enhance protection against phagocytosis and aid in adhesion. (B)</p> Signup and view all the answers

How do fungi obtain nutrients, being heterotrophic organisms?

<p>By absorbing nutrients from organic matter in their environment. (C)</p> Signup and view all the answers

What is the role of rhizobia in bioremediation?

<p>Degrading pollutants in soil and water. (C)</p> Signup and view all the answers

Flashcards

Bacterial Capsule

A polysaccharide layer outside the cell wall, providing enhanced protection and adhesion for bacterial cells.

Bacterial Pili

Hair-like structures on bacteria involved in adhesion and genetic material transfer during conjugation.

Fungi

Single-celled, eukaryotic microorganisms, including yeasts, molds, and mushrooms; characterized by membrane-bound organelles and a nucleus.

Fungal Hyphae

Thread-like structures that form a network called mycelium in multicellular fungi.

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Microbial Metabolism

Microbes obtain energy and nutrients to grow and reproduce via these biochemical processes.

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Phototrophs

Microbes that use light as an energy source.

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Fermentation

An anaerobic process breaking down organic compounds to produce energy, often resulting in byproducts like ethanol or lactic acid.

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Mutualism

Ecological interaction where both organisms benefit, such as nitrogen-fixing bacteria in plant roots.

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Bioremediation

Using microbes to degrade pollutants in soil and water.

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Totora in Bioremediation

The totora-associated microbes are used for bioremediation in contaminated wetlands.

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Study Notes

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