22 Questions
What is the main role of chemoheterotrophic prokaryotes in ecosystems?
Break down dead organisms and waste products
Which term describes the relationship between two species where one benefits while the other is neither harmed nor helped?
Commensalism
What is the main difference between exotoxins and endotoxins released by pathogenic bacteria?
Source of toxins
How do mutualistic bacteria in human intestines benefit the host?
Aid in food digestion
Which type of symbiosis involves harming but not killing the host organism?
Parasitism
What is the primary function of Gram-positive bacteria in causing diseases?
Secrete exotoxins outside the cell
What is the size range of most prokaryotic cells?
0.5–5 µm
Which of the following is a common shape of prokaryotic cells?
Spheres (cocci)
What is the main characteristic that distinguishes prokaryotes from eukaryotes?
Presence of a nucleus
Which term is used to describe rod-shaped bacteria?
Bacilli
What structures contribute to the success of prokaryotes?
Cell-Surface Structures
Which domain do prokaryotes belong to?
Archaea
What is the role of oxygen in metabolism for obligate anaerobes?
Obligate anaerobes are killed by O2 and must survive without it
Which bacteria group includes organisms that do not have a cell wall?
Chlamydias
What type of bacteria are Mycoplasma and Chlamydia in terms of their nutritional requirements?
Chemoheterotrophs
Which bacterial group is known for containing pathogens that can cause blood poisoning and stomach ulcers?
Epsilon-proteobacteria
In what kind of environment do extreme halophiles live?
Highly saline environments
Which bacteria group includes sulfur bacteria such as Thiomargarita namibiensis?
Proteobacteria
What is the role of nitogen fixation in prokaryotes?
Convert atmospheric nitrogen into ammonia for absorption by organisms
What type of bacteria are Actinomycetes known to be in terms of their role in soil?
Decomposers of soil
Which bacterial group includes the causative agent of Lyme disease?
Spirochetes
What is the nutritional characteristic of Cyanobacteria?
Photoautotrophs utilizing light energy for photosynthesis
Explore the role of prokaryotes in the recycling of chemical elements within ecosystems. Learn how chemoheterotrophic prokaryotes act as decomposers and affect the availability of essential nutrients for plant growth. Understand how prokaryotes can both increase and decrease nutrient availability.
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