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Microbiology Cell Structures and Functions

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Termini in questo insieme (18)

  • What is the cytoplasm in bacterial cells?

    The cytoplasm is a thick, aqueous, elastic, semitransparent substance inside the plasma membrane, composed of 80% water plus proteins, carbohydrates, lipids, and ions.

  • What are the functions of the cytoskeleton in bacteria?

    The cytoskeleton is involved in cell division, maintaining cell shape, growth, and DNA movement.

  • What is the nucleoid in bacteria?

    The nucleoid is the region containing the bacterial chromosome and plasmids, without a nuclear membrane.

  • What are plasmids?

    Plasmids are small, circular DNA molecules separate from the bacterial chromosome, often carrying genes for antibiotic resistance or other functions.

  • What are ribosomes and their role in bacteria?

    Ribosomes are the sites of protein synthesis, composed of protein and ribosomal RNA, with a 70S size made of 50S large and 30S small subunits.

  • Name antibiotics that interfere with prokaryotic ribosomal function.

    Antibiotics include streptomycin, gentamicin, erythromycin, and chloramphenicol.

  • What are inclusions in bacterial cells?

    Inclusions are reserve deposits of nutrients such as metachromatic granules (phosphate), polysaccharide granules, lipid inclusions, and sulfur granules for energy storage.

  • What is the function of carboxysomes?

    Carboxysomes contain the RuBisCO enzyme for CO\(2\) fixation during photosynthesis.

  • What are gas vacuoles and their function?

    Gas vacuoles are protein-covered cylinders that maintain buoyancy in aquatic bacteria.

  • What are magnetosomes?

    Magnetosomes are iron oxide inclusions that help bacteria orient in magnetic fields and can destroy H\(2O_2\).

  • What are bacterial endospores?

    Endospores are highly resistant structures formed by some bacteria to survive desiccation, heat, chemicals, and radiation.

  • Which bacterial genera produce endospores?

    Endospores are produced by members of the genera Bacillus and Clostridium.

  • What is sporulation?

    Sporulation is the process by which bacteria form endospores.

  • What is germination in bacterial endospores?

    Germination is the process where an endospore returns to a vegetative, active bacterial cell.

  • Why are endospores important to the food industry?

    Endospores can survive harsh conditions, making them important in food safety due to their resistance to heat and chemicals.

  • What are flagella and their function?

    Flagella are long, few in number projections used for bacterial locomotion.

  • What are cilia and their function?

    Cilia are short, numerous projections used to move substances along the cell surface.

  • What are flagella and cilia made of?

    Both flagella and cilia consist of microtubules made of the protein tubulin.