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Microbes are the tiny microorganisms that inhabit the world with us, around us, and even in us. Learn more about how these microscopic beings affect our lives.

What Are Microbes?

When a friend informs you that a spider is crawling on your arm, you might react with alarm and try to frantically swat the creature away. Fortunately, this probably doesn’t happen often, as we don’t normally find things crawling on us. Or do we? That depends on whether or not you are counting the trillions of tiny organisms inhabiting your body on a daily basis.Welcome to the world of microbes – a massive population of microorganisms too small to see with the naked eye, these creatures are literally everywhere.

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But before you panic about the fact that they are presently inhabiting your body, it is important to understand that they typically do much more good than harm.While some examples such as bacteria and viruses are usually to blame when we get sick, the benefits of microbes to our world are vast. In this lesson, learn more about this unseen group of organisms and gain a better understanding of how they fit into our world.

Types of Microbes

As mentioned previously, microbes are found literally everywhere in our world. They live in soil, on plants, and in and on our bodies. They thrive in ponds and streams, and they inhabit our oceans.

Microbes are all around us in the air, not to mention on every surface of our home. They have even adapted to living in boiling thermal vents as well as ice-covered lands.So what exactly are these tiny creatures? There are five main groups of microbes populating our earth. These include bacteria, viruses, fungi, algae and protozoa. You are most likely familiar with some of these organisms. Many of us have a negative association with the thought of bacteria and viruses. When stricken with stomach flu, common cold, infections and other ailments, we start to point fingers at these tiny culprits.

You may know fungi as a group of organisms that include mushrooms and the mold we find lurking in old food. However, one member of this group is a microbe that many of us consume on a daily basis. Yeast, a single-celled microbe, is well known for its ability to ferment sugar in bread dough to make it rise.In terms of algae, you are probably picturing the green seaweed floating in the lake you swam in last summer. However, some algae species are microscopic, such as marine diatoms. And protozoans are miniscule animal-like creatures that we find in watery environments, such as the blob-like amoeba.

Uses for Microbes in Our World

So, what roles do these microorganisms play in our lives, and what makes them important? Let’s start with bacteria.


Although bacteria can cause illness and often get bad press, they also benefit us in many ways. For example, we may panic when we hear of an E. Coli outbreak on the news. However, this is a type of bacteria that lives happily in our intestines, helping us by breaking down our food.Bacteria are also beneficial in that some are used in antibiotics. There are certain types of bacteria found in soil that actually target and kill other bacteria.

And you’ve no doubt heard of the active cultures in yogurt. Once again, these are healthy bacteria that aid in our digestion. Finally, some bacteria even have the ability to make their own food through photosynthesis. Cyanobacteria is one such microbe, and it contributes oxygen to the atmosphere through this process.


Now let’s take a look at the microbial members of the kingdom Fungi.

As previously mentioned, these tiny fungus called yeast is probably the most well-known. Responsible for making our bread rise and taste delicious, it also causes the fermentation that is needed to make wine and beer. And this is not the only important fungal microbe. One of the most well-known antibiotics, penicillin, is derived from a fungus found in the soil known as Penicillium.


We already mentioned diatoms as an example of microscopic algae. These unique creatures are able to undergo photosynthesis, thereby producing their own food as well as oxygen for other organisms.

In fact, these tiny organisms produce nearly 1/4 of the oxygen we breathe, which is impressive for a microorganism. Diatoms also provide a crucial food source for many other ocean-dwelling animals.


Finally, let’s look at the tiny organisms known as protozoans.

Literally meaning ‘tiny animal,’ these microscopic critters include amoeba and paramecium. Many protozoans are found floating or swimming through watery habitats, though some inhabit the soil. These creatures are animal-like in that they hunt and eat bacteria and other protozoans.Protozoans benefit the natural world by providing a food source for other animals. In other words, they are the bottom of the food chain. However, some types can be deadly. One type of amoeba causes dysentery, which makes a person extremely ill.

Another is carried in mosquitoes and causes malaria.


Finally, as far as viruses go, there are not very many positives to report. However, some scientists believe that viruses may contribute to healthy intestines just like bacteria. In addition, viruses are sometimes used to target and attack certain types of bacteria that are causing infection in place of using antibiotics.

Lesson Summary

Microbes are microorganisms that are too small to see with the naked eye. There are five major groups:

  • Bacteria
  • Viruses
  • Algae
  • Fungi
  • Protozoa

Although some microbes such as bacteria and viruses often make us sick, many are very beneficial.

Bacteria live in our intestines to aid in digestion. Yeast is used in making bread as well as beer and wine. Diatoms produce a great deal of oxygen. And, protozoans make up the bottom of the food chain.


There are five major groups of microbes.
The five microbe groups

Microbes are:

  • microorganisms that are too small too see with the naked eye
  • found on every surface and in every habitat around the world, including inside the body
  • categorized into five major groups: bacteria, viruses, algae, fungi, and protozoa
  • incredibly important to life processes, including human digestion, oxygen creation, and certain food chains

Learning Outcomes

Subsequent to studying these details on microbes, you could be prepared to:

  • Indicate the places in which microbes can be found
  • Enumerate the five categories of microbes
  • List some of the various roles of microbes

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