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Difference Between Yeast and Bacteria


Do you know? We, as large organisms, allow numerous microorganisms to share our food, air, water, and shelter with them every day. These include many bacteria, viruses, and fungi. Want to grab the difference between yeast and bacteria?

Both are living bodies where yeast is a eukaryote and bacteria is a prokaryote. All life forms are majorly classified as either prokaryotes or eukaryotes. The former falls under the earliest category of microorganisms having a single cell.

On the other hand, the latter primarily is a multicellular cell, containing all essential organelles. There are many differences between yeast and bacteria, but the chief variation lies in one being the eukaryote and the other prokaryote. Let us move further to discover more dissimilarities between the two!

Comparison Table

Basis of ComparisonYeastBacteria
Type of MicroorganismEukaryotesProkaryotes
Composition of Cell WallComposed of chitinComposed of murein
Ribosomal Subunit80S Ribosome70S Ribosome
Membrane-Bounded OrganellesPresentAbsent
MobilityCannot moveCan show mobility through flagella

Explain Yeast

Yeast is a colorless microorganism that belongs to Kingdom Fungi. Despite being unicellular in nature, it is a eukaryote, having a distinct nucleus and membrane-confined organelles. One of the prominent features of this eukaryote is that it multiplies asexually by a process called budding. Yeasts show a synergistic relationship to reproduction in plants and animals. They encounter digestion by releasing their special enzymes on the organic material and absorbing its nutrients. Some yeasts are parasitic, which can cause a vaginal yeast infection, for instance, Candida albicans.


These days, yeasts are extensively used in fermentation because they can convert sugar into carbon dioxide and alcohol. There are various uses of yeast, including beer production, baking, non-alcoholic drinks, etc.

Explain Bacteria

Bacteria are considered the first living microorganisms discovered 3.5 billion years ago. They are prokaryotes that can be autotrophs or heterotrophs. It means bacteria can produce their own food through photosynthesis, and some rely on others for nutrition. They can reproduce either sexually or asexually by conjugation, binary fission, or fragmentation processes.


There are three shapes of bacteria, such as rod-shaped, spherical, and spiral. These unicellular micro-species have 70S ribosomal subunits and DNA material floating free in the cell. Their cell wall is made of peptidoglycan called “murein.” Some bacterial shapes have flagella, helping them in their movement.

Humans are utilizing bacteria in many industrial and pharmaceutical processes, including types of fermentation, manufacturing of vaccines, antibiotics preparations, etc. Just as beneficial, there are harmful bacteria too, which may provoke chronic infections and diseases like pneumonia, TB, cholera, and food poisoning.

Know the Similarities Between Yeast & Bacteria

There are a few key similarities seen between yeast and bacteria, such as:

Unicellular Organisms: Both microorganisms are single-celled.

Observation: Their detailed structure can be observed under a compound or electron microscope.

Polysaccharide: Both yeast and bacteria have a cell wall solely composed of polysaccharides.

Anaerobic Respiration: Both micro-entities are capable of undergoing anaerobic respiration, a type of cellular respiration.

Causes of Diseases: Despite being useful in many ways, both can be parasitic too. Therefore, they are capable of causing diseases in living organisms.

Find the Differences Between Yeast & Bacteria



These are the unicellular microscopic organisms that fall under Kingdom Fungi and are eukaryotes. You can see them under a student microscope as well


These are the unicellular microorganisms that fall under Kingdom Monera and are prokaryotes.

Nucleus & Other Organelles



It has a unicellular structure with a single nucleus and membrane-bounded organelles. So, the organelles include Golgi bodies, mitochondria, lysosomes, etc.


As bacteria are prokaryotes, so they do not have a distinct nucleus and other membrane-limited organelles.

Composition of Cell Wall

Although both organisms have a cell wall made up of polysaccharides.


A yeast cell wall composed of polysaccharides is called chitin.


A bacterial cell wall composed of polysaccharides is called murein.

Structure Under a Microscope


These are seen as distinctive cells with an oval shape.



These are seen as small, spherical/rod-shaped cells that are patterned in clusters.


Both can reproduce either sexually or asexually, but:


This microorganism usually replicates through budding.


These microorganisms replicate through binary fission and not the budding.

Survival pH Range


An optimal pH range in which yeast can survive is 4-4.6, which is acidic.


An optimal pH range in which a bacterium can survive is 6.5-7, which is basic.

Diseases Caused


This fungus can be dangerous in many ways. It can cause diseases like mycosis, candidiasis, and vaginal infections in humans.


There are many useful bacteria, but some cause diseases like tetanus, cholera, pneumonia, and food poisoning in humans.




Some common examples of yeast include Candida albicans, baker’s yeast, and C. neoformans.


A few of many bacterial examples include Clostridium botulinum, Escherichia coli, and Lactobacillus acidophilus.


We hope to clear all major differences between yeast and bacteria. These unicellular living microorganisms are as essential as any other thing for humans. Science has stepped into the world where everything is intelligently utilized, and so do yeast and bacteria. Nowadays, biologists are using it in various pharmaceutical and industrial mechanisms. Bacteria are broadly found in the body as probiotics and consumed in preparing antibiotics and vaccines. Whereas, on the other side, yeast helps in fermentation. Both hold their own importance but may cause various diseases too.

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