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Archaea vs Bacteria

Delve into the microscopic world where Archaea and Bacteria dominate. This article elucidates the distinctiveness and similarities between these two primary domains of life - focusing on Archaea vs Bacteria. You'll gain insights into their definitions, cell wall structures, unique characteristics, and typical examples. From exploring distinct structural facets to understanding a comparative breakdown against Eukarya, your knowledge of Microbiology will expand exponentially. Unearth the remarkable biodiversity and underlying differences in this comprehensive discourse on Archaea vs Bacteria.

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Archaea vs Bacteria

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Delve into the microscopic world where Archaea and Bacteria dominate. This article elucidates the distinctiveness and similarities between these two primary domains of life - focusing on Archaea vs Bacteria. You'll gain insights into their definitions, cell wall structures, unique characteristics, and typical examples. From exploring distinct structural facets to understanding a comparative breakdown against Eukarya, your knowledge of Microbiology will expand exponentially. Unearth the remarkable biodiversity and underlying differences in this comprehensive discourse on Archaea vs Bacteria.

Understanding the Basics: Archaea vs Bacteria

When discussing the topic of microbiology, two important groups that you often encounter are archaea and bacteria. These two types of microorganisms, while similar in some ways, exhibit vast differences in many aspects, from their structure to their biological functions.

Definition: Archaea vs Bacteria

Literally speaking, bacteria and archaea are single-celled microscopic organisms that have existed on Earth for millions of years. However, they differ fundamentally in terms of their cellular structure and genetic makeup.

Bacteria are typically single-celled organisms included in the prokaryote domain. They exhibit various shapes, such as spherical (cocci), rod-shaped (bacilli), or spiral (spirilla), and they play a crucial role in the environment, medicine, and technology.

Archaea, on the other hand, are also single-celled, prokaryotic microorganisms, but they are known to survive in extreme environmental conditions where most bacteria cannot thrive. They include methanogens, which produce methane gas, halophiles that exist in extremely salty environments, and thermophiles that live in intensely hot environments.

Key Pointers: Archaea vs Bacteria Cell Wall

Biologists often differentiate between bacteria and archaea based on the composition of their cell wall. Here's a brief comparison:
  • Bacteria primarily have either a thin or thick peptidoglycan layer in their cell wall.
  • Archaea, though, have a variety of compound structures in their cell wall – but none include peptidoglycan.

Identifying Archaea vs Bacteria Differences

While both belonging to the prokaryotes, archaea and bacteria differentiate in their cellular structures, metabolic functions, and even the environments they inhabit. This makes them distinct from each other on various levels.

For instance, both bacteria and archaea utilize different metabolic pathways. Bacteria employ the standard metabolic pathways known as glycolysis, the Krebs cycle, or the pentose phosphate pathway. Archaea, however, utilize other unique metabolic pathways.

Adding on to their differences, consider the following comparison between bacteria and archaea represented in a table:
BacteriaArchaea
Cell WallPeptidoglycanDoes not contain Peptidoglycan
Metabolic PathwaysGlycolysis, Krebs CycleUnique Pathways
EnvironmentNormal ConditionsExtreme Conditions

Exploring Examples: Archaea vs Bacteria

In the fascinating world of microbiology, archaea and bacteria represent two of the most diverse and interesting groups of organisms. To further comprehend the differences between these two groups, it is helpful to look at some examples of typical archaea and bacteria species. These examples not only reveal the distinct characteristics of each group but also illustrate their wide range of roles and impacts on life on Earth.

Common Archaea Examples

Let's first dig deeper into the archaea kingdom. Archaea are usually found in extreme environments, a quality that has earned them the nickname "extremophiles". Here are a few examples:
  • Methanosarcina: Methanosarcina is a unique type of archaea in that it can thrive in both anaerobic and aerobic conditions. This microorganism exhibits a unique energy-gathering mechanism by converting organic matter like acetate into methane \(CH_4\) under anoxic conditions.
  • Halobacterium: This type of archaea is found in extremely salty environments, like the Dead Sea or the Great Salt Lake. They have an unusual light-driven proton pump, bacteriorhodopsin, that allows them to generate ATP using light.
  • Thermoplasma: These organisms inhabit extremely hot, sulphuric environments like hot springs or coal refuse piles. Interestingly, Thermoplasma do not have cell walls, making them appear almost ghost-like under the electron microscope.
In addition, the metabolic capabilities of archaea are quite intriguing. While bacteria often generate energy through glycolysis or the Krebs cycle, archaea, like Methanosarcina, utilize unique processes. For example, Methanosarcina uses the aceticlastic methanogenesis pathway, shown below: \[ CH_3COOH \rightarrow CH_4 + CO_2 \]

Typical Bacteria Examples

On the flip side, bacteria are a diverse group of organisms that are found in a variety of environments, ranging from soil to the human body. Here are a few examples:
  • Escherichia coli: Commonly known as E. coli, this bacterium inhabits the intestines of humans and other warm-blooded animals. While most strains are harmless, some can cause health issues like urinary tract infections or diarrhoea.
  • Staphylococcus aureus: Also known as staph, this bacterium can be found on the skin or in the nose and is responsible for a number of minor to severe infections, including skin infections, respiratory diseases, and food poisoning.
  • Streptococcus pneumoniae: This bacterium is the leading cause of pneumonia in humans. Apart from the lungs, they can also attack other parts of the body, causing diseases such as meningitis, sinusitis, and ear infections.
Though bacteria demonstrate a wide range of metabolic capabilities, the classic pathway used for energy generation is the glycolysis followed by the Krebs cycle, which is represented by this formula: \[ C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + energy \] This further highlights the breadth of life's ingenious mechanisms for extracting energy from the environment—all while contributing to the incredible diversity and complexity of life on Earth.

Breaking Down the Structures: Archaea vs Bacteria

You may ask yourself: since both bacteria and archaea are prokaryotes, do they boast similar structures? Well, although at first glance they seem similar, a closer examination will show significant differences in their structural features. This divergence can shape how each group adapts to its environment, replicates, and performs other vital functions.

Analysing Archaea Structure

Let's begin by unraveling the intricacies of the archaeal structure. As previously highlighted, archaea stand their ground in some of the harshest environments on the planet and their hardy structure greatly aids their survival. To start with, the outermost layer of the archaeal cell is a plasma membrane, just like in other cellular organisms. However, archaea tend to diverge from the norm with their cellular membranes' lipid composition. Instead of having a bilayer of ester-linked phospholipids like bacteria and eukaryotes, archaea employ a monolayer or bilayer of **ether-linked phospholipids**. Such a configuration makes them particularly steadfast and impervious to harsh conditions. To illustrate this, consider the chemical differences between the two types of linkages: For ester linkages in bacteria and eukaryotes: \[ R-COO-R' \] For ether linkages in archaea: \[ R-O-R' \] A second distinguishing feature in most archaeal cells is their unique cell wall. Unlike bacteria that primarily use **peptidoglycan**, archaea bestow a variety of substances, including **pseudo-peptidoglycan**, **polysaccharides**, **proteins** or even **glycoproteins** to make their cell walls. Finally, one cannot overlook the unique genetic apparatus of archaea that leans more towards eukaryotes than bacteria. Archaea possess circular, singular chromosomes like bacteria, nevertheless, many exhibit unique DNA replication and transcription mechanisms reminiscent of eukaryotes rather than bacterial processes. So in summary, the salient features of archaea structure includes:
  • A unique plasma membrane consisting of ether-linked phospholipids.
  • A varied cell wall made from pseudo-peptidoglycan, polysaccharides, proteins, or glycoproteins.
  • A genetic apparatus more similar to eukaryotes.

Delving into Bacteria Structure

Turning our focus to bacteria, we find an elegant yet robust structure tailored to adaptability and resilience. Bacteria showcase diversity in shapes and sizes with a common structural blueprint that has stood the test of time. At the heart of a bacterium rests its DNA - a single, covalently closed circular chromosome. Unlike archaea and eukaryotes, bacterial DNA is supercoiled and clustered within a region known as the **nucleoid**. For the outer cover, bacteria have a plasma membrane akin to all cellular life forms. The phospholipid composition of this membrane differs from that of archaea as it consists of **ester-linked phospholipids**, arranged in a bilayer. Beyond the cell membrane, bacteria boast a sturdy cell wall comprised mainly of **peptidoglycans**. In contrast to their archaeal counterparts, all bacteria own a peptidoglycan layer in their cell wall, providing a classification basis into Gram-positive or Gram-negative bacteria. Another structure unique to certain bacteria is the **flagella**, long whip-like structures that confer motility, enabling bacteria to migrate towards favourable conditions or away from threats. In summary, the structure of bacteria encompasses:
  • A single, supercoiled, circular chromosome situated in a nucleoid region.
  • A plasma membrane composed of ester-linked phospholipids.
  • A principally peptidoglycan-based cell wall.
  • Flagella—that facilitate movement—in some bacteria.
This structural dissimilarity underscores how archaea and bacteria, despite being categorised as prokaryotes, have evolved unique adaptations to fit into their respective niches over millennia.

Characteristics Showdown: Archaea vs Bacteria vs Eukarya

One of the best ways to comprehend the organismal divide among archaea, bacteria, and eukarya is by examining the key characteristics that each possesses. These characteristics can provide clues about their respective environments, growth patterns, and overall biochemistry.

Archaea Characteristics in Comparison

Let's embark first on the noteworthy characteristics of archaea. As previously emphasised, archaea are highly resistant to their environment, which can be attributed largely to their unique cell structure. The cell membrane of archaea, in particular, consists of **ether-linked phospholipids** which naturally yield a high resistance to heat and other physical challenges. Another important trait of archaea is their diverse range of energy-acquiring mechanisms. Especially interesting is their ability to utilise hydrogen gas, carbon dioxide, and metal ions to produce energy, allowing them, for instance, to survive in extremely harsh environments such as the sulphuric hot springs or the high-salinity Dead Sea. Consider their metabolic versatility, an example being the methanogenesis pathway, where: \[ 4H_2 + CO_2 \rightarrow CH_4 + 2H_2O \] This process not only helps them to endure in environments lacking oxygen but also contributes to the world's methane reservoir. Finally, the unique cell wall structure of archaea bestows them with extraordinary flexibility. Unlike bacteria which primarily use peptidoglycan to construct their cell walls, archaea employ a range of other materials including pseudo-peptidoglycans, proteins, or polysaccharides.

Bacteria Characteristics in Comparison

Bacteria, arguably the most abundant and versatile life forms on Earth, also manifest their own distinctive characteristics. The primary attribute that sets bacteria apart from archaea and eukarya is their **peptidoglycan-rich cell wall**. This not only gives bacteria their strength and shape but also renders the key to differentiating between Gram-positive and Gram-negative bacteria during the Gram stain procedure. On the biochemistry side, bacteria possess a metabolic flexibility that enables them to adjust to an enormous range of environments. This metabolic plasticity is augmented by the presence of plasmids—small, circular, extrachromosomal DNA that often carry genes providing benefits such as antibiotic resistance. Moreover, some bacterial species are motile, which is facilitated by whip-like structures known as **flagella**. The ability to move towards or away from environmental cues (a process called chemotaxis) can significantly enhance the survival rate of these organisms. In a nutshell, bacterial characteristics can be streamlined as:
  • Cell wall predominantly made of peptidoglycan.
  • Metabolic versatility and adaptability enhanced by plasmids.
  • Motility in some species due to the presence of flagella.

Eukarya Characteristics in the Mix

Lastly, eukaryotes - organisms with complex cells, or a single cell with a complex structure. In these cells, the genetic material is organised into chromosome(s) inside a distinct nucleus. The best-known eukaryotes include animals, plants, fungi, and protists. Unlike bacteria and archaea, eukaryotes are distinguished by the presence of **organelles**, specialised subunits within the cell that perform specific tasks. These include the mitochondria, which generates most of the cell's supply of adenosine triphosphate (ATP), and the endoplasmic reticulum and Golgi apparatus, which play a role in protein translation and transportation. Another distinguishing feature of eukaryotes is their **cytoskeleton**, a dynamic network of interconnected protein filaments within the cell. It provides shape, aids in intra-cellular transport, facilitates cell division, and contributes to movements in multicellular organisms among other things. The complex structure of eukaryotic cells, comprising:
  • Presence of organelles such as mitochondria, endoplasmic reticulum, and Golgi apparatus.
  • A dynamic cytoskeleton offering several key physiological functions.
This comparison of key characteristics reiterates the contrasting features of archaea, bacteria, and eukarya, while also underscoring the uniqueness each group brings to the table in the grand scheme of life on Earth.

Deciphering the Differences: Archaea vs Bacteria Characteristics

Peeking under the microscope, you will witness a fascinating world of the unseen, filled with a multitude of minuscule life forms, notable among which are bacteria and archaea. These single-celled organisms are strikingly distinct in several ways, ranging from their biochemical processes, cellular structures, to the ecosystems they thrive in. Delve with us into a journey where we uncover the unique characteristics of archaea and bacteria.

Unique Characteristics of Archaea

As you might already know, archaea are renowned for their resilience, flourishing in some of the most hostile environments - such as in volcanic hot springs, highly saline bodies of water, or even deep-sea hydrothermal vents. These environments are extremes of temperature, pressure, salinity, or acidity, conditions most life forms would shy away from. What really powers this profound survival capability of archaea? Central to the toughness of archaea is their unique cellular architecture. Eyeballing their outermost layer, you'll find a plasma membrane quite like other life forms, but with a critical twist. Instead of the norm of a bilayer of ester-linked phospholipids seen in bacteria and eukaryotes, archaea sport a monolayer or bilayer of ether-liked phospholipids. To illustrate, chemically, the two linkages are as follows: The ester linkages (bacteria and eukaryotes): \[ R-COO-R' \] and, the ether linkages (archaea): \[ R-O-R' \] Another striking feature of archaea is their metabolic diversity. Unlike other organisms that typically opt for more common modes of metabolism such as photosynthesis or respiration, several archaea employ unconventional metabolic pathways. Methanogenesis is one such pathway unique to certain archaea, adding to both their survivability and to the global methane reservoir: \[ 4H_2 + CO_2 \rightarrow CH_4 + 2H_2O \] Finally, archaea's unique genetic apparatus should not be overlooked. While they do possess circular, singular chromosomes like bacteria, many exhibit DNA replication and transcription mechanisms shared more with eukaryotes than their bacterial cousins. This intriguing detail adds another layer to the multifaceted puzzle of archaea. In summary, the key characteristics setting archaea apart include:
  • Plasma membrane made of ether-linked phospholipids.
  • Unique metabolic pathways such as methanogenesis.
  • Dna replication and transcription mechanisms similar to eukaryotes.

Distinctive Characteristics of Bacteria

Bacteria, ubiquitously present across Earth's habitats, from the human gut to miles beneath the ocean surface, possess their own defining characteristics. Firstly, the structure of bacterial cells is significantly different from archaea. A bacterium houses its DNA - a single circular chromosome, supercoiled and nestling within a region called the nucleoid. The chromosome, unlike eukaryotes, is not bound by a nuclear membrane, keeping in line with the bacteria's classification as prokaryotes. Next, let's glide past the cell membrane and reach the cell wall of bacteria, primarily made of **peptidoglycans**. This is in stark contrast with their archaeal counterparts, which do not employ peptidoglycan for their cell walls. Furthermore, another distinct feature of bacteria is their incredible metabolic flexibility. Many bacteria are known to adapt to a broad range of environmental inputs for their metabolic requirements and carry plasmids - extra-chromosomal DNA elements, that often have genes lending survival advantages such as antibiotic resistance. Lastly, some bacteria exhibit the ability to move - motility. This is granted by long whip-like appendages, known as **flagella**, which allow bacteria to move towards nutrients or away from harmful substances. To enumerate, unique bacterial characteristics include:
  • Single circular chromosome in a nucleoid region.
  • Cell wall mainly composed of peptidoglycans.
  • Metabolic flexibility enhanced by plasmids.
  • Motility due to the presence of flagella in some species.
As you delve deeper into their characteristics, the divide between archaea and bacteria becomes clear. These differences not only set them apart phylogenetically but also illuminate their unique roles and competencies within their respective ecosystems. Always remember, while they may be small, their impact is anything but.

Archaea vs Bacteria - Key takeaways

  • Bacteria and Archaea differences include their cell wall makeup, where bacteria have peptidoglycan and Archaea does not, and different metabolic pathways, with bacteria using glycolysis and the Krebs cycle and Archaea having unique processes.
  • Archaea examples include Methanosarcina, which thrives in both anaerobic and aerobic conditions, Halobacterium, found in salty environments and Thermoplasma, which inhabits hot, sulphuric conditions.
  • Bacteria examples include Escherichia coli, found in the intestines of warm-blooded animals, Staphylococcus aureus, found on skin or in the nose, and Streptococcus pneumoniae, a lead cause of pneumonia in humans.
  • The structure of Archaea includes a plasma membrane consisting of ether-linked phospholipids, a varied cell wall made from pseudo-peptidoglycan, polysaccharides, proteins, or glycoproteins, and a genetic apparatus more similar to eukaryotes.
  • The structure of bacteria includes a single, supercoiled, circular chromosome situated in a nucleoid region, a plasma membrane composed of ester-linked phospholipids, a predominantly peptidoglycan-based cell wall, and, in some bacteria, flagella that facilitate movement.

Frequently Asked Questions about Archaea vs Bacteria

Archaea and bacteria are both single-celled organisms differing in their genetic makeup and cell structure. Bacteria have peptidoglycan in their cell walls, while archaea do not. Archaea are often found in extreme environments and their metabolism differs significantly from bacteria.

Archaea examples include Methanogens, found in swamps and digestive tracts, and Halophiles, detected in high-salt environments. Bacteria examples include E. coli, typically located in intestines, and Streptococcus pneumoniae, found in the human respiratory tract.

Archaea and bacteria are both single-celled organisms but vary significantly. Archaea have distinct membrane composition, resist harsh environments, and use non-photosynthetic processes for energy. Bacteria, however, contain peptidoglycan cell walls, are usually susceptible to antibiotics, and can perform photosynthesis.

Bacteria and Archaea are both microorganisms but belong to different domains of life. The key differences are their cell membrane structure and the presence of peptidoglycan. Bacteria have peptidoglycan in their cell walls, whereas Archaea do not. Additionally, Archaea can survive in more extreme environments than bacteria.

Based on current scientific understanding and fossil records, bacteria are believed to have originated first, followed by archaea. However, this is still a topic of ongoing research and debate within the scientific community.

Final Archaea vs Bacteria Quiz

Archaea vs Bacteria Quiz - Teste dein Wissen

Question

What are the main differences between bacteria and archaea based on their cellular structure and genetic makeup?

Show answer

Answer

Bacteria are single-celled organisms in the prokaryote domain with varied shapes playing crucial roles in the environment, medicine, and technology. Archaea, also single-celled and prokaryotic, survive in extreme environmental conditions. Their cell walls also differ in composition.

Show question

Question

How do bacteria and archaea primarily differ in terms of their cell walls?

Show answer

Answer

Bacteria primarily have either a thin or thick peptidoglycan layer in their cell wall. Archaea, however, have a variety of compound structures in their cell wall - but none include peptidoglycan.

Show question

Question

Do bacteria and archaea use the same metabolic pathways?

Show answer

Answer

No, bacteria employ standard metabolic pathways such as glycolysis, the Krebs cycle or the pentose phosphate pathway, while archaea utilise other unique metabolic pathways.

Show question

Question

What are some examples of organisms in the archaea kingdom and where are they typically found?

Show answer

Answer

Examples of archaea include Methanosarcina which thrives in both anaerobic and aerobic conditions, Halobacterium found in extremely salty environments like the Dead Sea, and Thermoplasma which inhabits extremely hot, sulphuric environments like hot springs.

Show question

Question

What are some typical bacteria species and where can they be often found?

Show answer

Answer

Typical bacteria are Escherichia coli which inhabits the intestines of humans and warm-blooded animals, Staphylococcus aureus often found on the skin or in the nose, and Streptococcus pneumoniae which is a leading cause of pneumonia in humans.

Show question

Question

How does Methanosarcina, a type of archaea, get its energy?

Show answer

Answer

Methanosarcina uses a unique energy-gathering mechanism by converting organic matter such as acetate into methane under anoxic conditions.

Show question

Question

What are the unique features of archaeal structure?

Show answer

Answer

The unique features of archaeal structure include a plasma membrane consisting of ether-linked phospholipids, a varied cell wall made from substances like pseudo-peptidoglycan and proteins, and a genetic apparatus more similar to eukaryotes.

Show question

Question

How does the structure of bacteria differ from archaea?

Show answer

Answer

The structure of bacteria includes a single, supercoiled, circular chromosome in a nucleoid region, a plasma membrane of ester-linked phospholipids, a mainly peptidoglycan-based cell wall, and some bacterium have flagella for movement.

Show question

Question

What are the differences in plasma membrane lipid composition between archaea and bacteria?

Show answer

Answer

The plasma membrane of archaea consists of ether-linked phospholipids, while that of bacteria consists of ester-linked phospholipids.

Show question

Question

What is a key characteristic of archaea that contributes to their environmental resistance?

Show answer

Answer

The cell membrane of archaea consists of ether-linked phospholipids, providing strong resistance to heat and other physical challenges.

Show question

Question

What are the key defining characteristics of bacteria?

Show answer

Answer

Bacteria have a peptidoglycan-rich cell wall, possess metabolic versatility and flexibility by means of plasmids, and some are motile due to the presence of flagella.

Show question

Question

What distinguishes eukaryotes from bacteria and archaea?

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Answer

Eukaryotes are defined by the presence of organelles such as mitochondria, endoplasmic reticulum, and Golgi apparatus, and a dynamic cytoskeleton offering several key physiological functions.

Show question

Question

What are the key characteristics that set Archaea apart?

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Answer

Archaea have a plasma membrane made of ether-linked phospholipids, unique metabolic pathways such as methanogenesis, and DNA replication and transcription mechanisms similar to eukaryotes.

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Question

What are the distinctive characteristics of Bacteria?

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Answer

Bacteria have a single circular chromosome in a nucleoid region. The cell wall is composed mainly of peptidoglycans. They have metabolic flexibility enhanced by plasmids. Lastly, some bacteria exhibit motility due to the presence of flagella.

Show question

Question

What are the unique metabolic pathways found in some Archaea?

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Answer

Some Archaea employ the unconventional pathway of methanogenesis, which notably contributes to the global methane reservoir.

Show question

Test your knowledge with multiple choice flashcards

What are the main differences between bacteria and archaea based on their cellular structure and genetic makeup?

How do bacteria and archaea primarily differ in terms of their cell walls?

Do bacteria and archaea use the same metabolic pathways?

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Flashcards in Archaea vs Bacteria15

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What are the main differences between bacteria and archaea based on their cellular structure and genetic makeup?

Bacteria are single-celled organisms in the prokaryote domain with varied shapes playing crucial roles in the environment, medicine, and technology. Archaea, also single-celled and prokaryotic, survive in extreme environmental conditions. Their cell walls also differ in composition.

How do bacteria and archaea primarily differ in terms of their cell walls?

Bacteria primarily have either a thin or thick peptidoglycan layer in their cell wall. Archaea, however, have a variety of compound structures in their cell wall - but none include peptidoglycan.

Do bacteria and archaea use the same metabolic pathways?

No, bacteria employ standard metabolic pathways such as glycolysis, the Krebs cycle or the pentose phosphate pathway, while archaea utilise other unique metabolic pathways.

What are some examples of organisms in the archaea kingdom and where are they typically found?

Examples of archaea include Methanosarcina which thrives in both anaerobic and aerobic conditions, Halobacterium found in extremely salty environments like the Dead Sea, and Thermoplasma which inhabits extremely hot, sulphuric environments like hot springs.

What are some typical bacteria species and where can they be often found?

Typical bacteria are Escherichia coli which inhabits the intestines of humans and warm-blooded animals, Staphylococcus aureus often found on the skin or in the nose, and Streptococcus pneumoniae which is a leading cause of pneumonia in humans.

How does Methanosarcina, a type of archaea, get its energy?

Methanosarcina uses a unique energy-gathering mechanism by converting organic matter such as acetate into methane under anoxic conditions.

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