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Microbiology Concepts
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Microbiology Concepts
microbio 131 exam 1 flashcards
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1
Question
What is microbiology?
Answer
Microbiology is the study of microorganisms, or microbes, which are organisms too small to be seen with the naked eye.
2
Question
What types of microorganisms are studied in microbiology?
Answer
Microorganisms studied in microbiology include bacteria, archaea, fungi, protozoa, algae, and viruses.
3
Question
Where can microorganisms be found?
Answer
Microorganisms are ubiquitous; they exist in the air, soil, water, and in and on other living organisms.
4
Question
What roles do microorganisms play in ecosystems?
Answer
Microorganisms play essential roles in ecosystems by decomposing organic matter, recycling nutrients, and maintaining environmental balance.
5
Question
How do microorganisms contribute to human health?
Answer
The microbiome, the collection of microbes in the human body, helps with digestion, immunity, and protection from harmful bacteria.
6
Question
What are some industrial applications of microorganisms?
Answer
Microorganisms are used in food production, biotechnology, and medicine.
7
Question
What are beneficial microorganisms?
Answer
Beneficial microorganisms are those that help decompose organic waste, recycle nutrients, and support ecosystem function.
8
Question
What is an example of how beneficial bacteria function in soil?
Answer
Bacteria in soil break down dead plants and animals, facilitating nutrient recycling.
9
Question
What are nitrogen-fixing bacteria?
Answer
Nitrogen-fixing bacteria are microbes that convert atmospheric nitrogen into forms that plants can use.
10
Question
What is normal microbiota?
Answer
Normal microbiota refers to the collection of microorganisms that reside in or on the body in a beneficial manner.
11
Question
How do microorganisms contribute to nutrient cycling?
Answer
Microorganisms recycle nutrients by decomposing organic matter and returning vital elements to the ecosystem in usable forms.
12
Question
What is the significance of the microbiome in human health?
Answer
The microbiome plays a crucial role in digestion, immune response, and protecting the body from harmful pathogens.
13
Question
Describe one way microbes are used in food production.
Answer
Microbes are used in food production by fermentation processes, such as using yeast in baking and brewing.
14
Question
Name three environments where microorganisms can be found.
Answer
Microorganisms can be found in air, soil, and water, as well as in and on living organisms.
15
Question
What is one of the critical functions of decomposing microorganisms?
Answer
Decomposing microorganisms break down dead organic matter, which is essential for recycling nutrients in ecosystems.
16
Question
Explain the role of archaea in microbiology.
Answer
Archaea are a domain of single-celled microorganisms that are distinct from bacteria and often thrive in extreme environments, playing unique roles in ecosystems.
17
Question
How do fungi contribute to their ecosystems?
Answer
Fungi decompose organic material and form symbiotic relationships with plants, helping with nutrient absorption and exchange.
18
Question
What health issues can arise from harmful bacteria?
Answer
Harmful bacteria can lead to infections, food poisoning, and other diseases that affect human health.
19
Question
What distinguishes bacteria from viruses in microbiology?
Answer
Bacteria are single-celled living organisms with cellular structures, while viruses are non-living entities that require a host to replicate.
20
Question
What beneficial roles do bacteria play in the human body?
Answer
Bacteria in the human body prevent infections and produce essential vitamins such as B12 and K.
21
Question
What are some applications of biotechnology using microbes?
Answer
Microbes are used in biotechnology to produce drugs (such as antibiotics), insulin, biofuels, and biodegradable plastics.
22
Question
What are pathogens?
Answer
Pathogens are disease-causing microorganisms.
23
Question
Give two examples of pathogens and the diseases they cause.
Answer
1. Mycobacterium tuberculosis causes tuberculosis. 2. Streptococcus pyogenes causes strep throat.
24
Question
What is a harmful toxin produced by some microbes, and which microbe produces it?
Answer
Clostridium botulinum produces botulinum toxin, which can harm humans.
25
Question
How can infectious diseases spread?
Answer
Infectious diseases can spread through air, water, food, or direct contact.
26
Question
Who developed the modern classification system of microorganisms?
Answer
The modern classification system was developed by Carl Woese.
27
Question
What are the three domains into which life is divided in the modern classification system?
Answer
The three domains are Bacteria, Archaea, and Eukarya.
28
Question
Describe the characteristics of Bacteria.
Answer
Bacteria are prokaryotic organisms that lack a nucleus, are unicellular, have peptidoglycan cell walls, and reproduce via binary fission.
29
Question
What are the characteristics of Archaea?
Answer
Archaea are also prokaryotic, lack peptidoglycan, and are known to live in extreme environments such as hot springs and salty lakes; examples include methanogens, halophiles, and thermophiles.
30
Question
What distinguishes Eukarya from Bacteria and Archaea?
Answer
Eukarya are characterized by the presence of a nucleus, distinguishing them from both Bacteria and Archaea.