About This Chapter
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- Have fallen behind in understanding bacteria, microbial contamination, the nitrogen cycle and thermophiles.
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- Start at the beginning, or identify the topics that you need help with.
- Watch and learn from fun videos, reviewing as needed.
- Refer to the video transcripts to reinforce your learning.
- Test your understanding of each lesson with short quizzes.
- Submit questions to one of our instructors for personalized support if you need extra help.
- Verify you're ready by completing the Microorganisms and the Environment chapter exam.
Why it works:
- Study Efficiently: Skip what you know, review what you don't.
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Students will review:
In this chapter, you'll learn the answers to questions including:
- Why is nitrogen fixation so important to human and plant life?
- What happens during the nitrogen cycle?
- What kinds of bacteria live in anaerobic or deepwater environments?
- What are thermophiles?
- How do microbials contaminate our drinking water?
1. The Nitrogen Cycle, Acid Rain and Fossil Fuels
Do you know the difference between nitrite and nitrate? Do you have any clue how all the nitrogen in the atmosphere becomes usable? If you can't answer these questions, then you need to watch this lesson on the nitrogen cycle.
2. Nitrogen Fixation: Significance to Plants and Humans
Almost 80% of our atmosphere is nitrogen, but we can't use it. We will look at how this unusable nitrogen is converted into a form we can use and why nitrogen is important to plants and humans.
3. Types of Bacteria Found in Anaerobic Environments
This lesson will focus in on the world of anaerobes. We'll discuss the different types of anaerobes that abound on this planet, including obligate, facultative and aerotolerant anaerobes.
4. Bacteria that Live in Deepwater Vent Ecosystems
In this lesson, we will talk about hydrothermal vents, what they are, and what they release. We'll also look into why the substances they release are important for bacteria and higher life forms such as crabs and tubeworms.
5. Thermus Aquaticus and Other Thermophiles: Definition & Examples
This lesson will go into some very interesting creatures known as thermophiles. We will discuss exotic sounding names such as Strain 121 and Thermus aquaticus and how they revolutionized our thought process and technology.
6. Microbial Contamination in Drinking Water: Sources & Control
This lesson will discuss what microbes may contaminate drinking water, what problems they may cause you, how we can test for them, and how we can control them. Find out as we look into coliform bacteria, giardia, and noroviruses.
7. Chemosynthesis: Definition & Equation
This lesson introduces the concept of chemosynthesis. It explains that energy is necessary for all life and provides a description of the chemosynthetic process. The lesson also includes examples of where chemosynthesis occurs in nature along with a brief quiz.
8. Obligate Aerobes: Definition & Examples
Obligate aerobes are organisms that need oxygen to survive and multiply. There are some interesting examples of obligate aerobes in the microbial world. Some are useful, some are dangerous, and others are part of our healthy body.
9. Facultative Aerobes: Definition & Examples
Facultative anaerobic bacteria stand out from other bacteria because they can live with or without oxygen. Some of these anaerobes can also cause disease in humans.
10. Amoeba Protist: Type & Description
In this lesson we will explore what makes a protist a protist and an amoeba an amoeba. We will also look at some unique characteristics of these organisms, such as their movement and their method of food consumption.
11. Examples of Diatom Protists
Diatoms are unicellular algae and are some of the most common types of plant material found in water. Read this lesson to learn more about these diverse algae and check out a number of examples--they're beautiful under the microscope!
12. Examples of Multicellular Protists
Protists are a group of organisms that share characteristics with plants, animals, and fungi, yet they are different enough to earn the status as a separate type of organism. Read this lesson to learn about the rare group of multicellular protists.
13. Examples of Pathogenic Protists
In this lesson, you'll explore a type of protist, known as a pathogenic protist, that can live inside another organism and cause it harm. You'll also examine specific types of pathogenic protists, how they enter humans, and the damage they can cause.
14. Examples of Protists with Flagella
In this lesson we explore what a protist is as well as what it means to be a flagellated protist. Learn some of the many ways this particular group of protists vary, including in environment, relationships, and feeding strategies.
15. Freshwater Protists Osmotic Problems
The protists are a very early form of life on our planet. Keep reading to learn more about an important adaption that freshwater protist contain that keeps them alive in water.
16. Harmful Protists: Definition, Effects & Examples
Protists are tiny organisms that are found all around us, even if we aren't aware they are there. Complete this lesson to learn about some of the harmful protists that exist and the effects they can have on humans.
17. Helpful Protists: Types & Activities
A few disease-causing protists have given the majority of protists a bad reputation. There are many ways protists are beneficial to people, animals and the environment. Here, you will learn what protists are and how they can be beneficial.
18. Photosynthetic Protists: Definition & Examples
This lesson defines protist and photosynthetic protists and gives examples of some relevant species. We'll also discuss mixotrophs and explains how they obtain nutrients in both plant-like and animal-like ways.
19. Plant-Like Protists: Characteristics & Reproduction
Protists are a group of organisms placed in a single kingdom because they do not quite fit into any of the other eukaryotic kingdoms. Plant-like protists resemble plants but have unique characteristics and reproductive options.
20. Animal-Like Protists: Definition, Characteristics & Examples
In this lesson, we'll explore the world of animal-like protists. We'll first discuss what it means to be a protist, then review characteristics that define a protist, and finally, look at a few examples of these widely-ranging organisms.
21. Extremophiles: Definition & Examples
Extremophiles live in conditions outside the moderate environments that most life requires. From high-temperature, deep sea vents to freezing, polar oceans, we'll explore life in some of the most extreme environments on Earth.
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Other chapters within the Microbiology: Help and Review course
- Biology Basics for Microbiology: Help and Review
- Microbiology Basics: Help and Review
- Bacterial Biology: Help and Review
- Microbiology Laboratory Techniques: Help and Review
- The Disease Process: Help and Review
- Introduction to Viruses: Help and Review
- DNA Viruses: Help and Review
- RNA Viruses: Help and Review
- Protozoan Diseases: Help and Review
- Fungal Infections: Help and Review
- Gastrointestinal Tract Illnesses & Infections: Help & Review
- Sexually Transmitted Bacterial Diseases: Help and Review
- Bloodborne Bacterial Diseases: Help and Review
- Bacterial Diseases of the Respiratory Tract: Help and Review
- Bacterial Skin and Wound Infections: Help and Review
- Immunology And the Body's Defenses Against Pathogens: Help and Review
- Antimicrobial Drugs: Help and Review
- Food and Industrial Microbiology: Help and Review
- Sterilization and Antiseptic Techniques: Help and Review