Yeast vs. Molds

The main differences between yeast and mold are, yeast is a unicellular organism which is thread-shaped while molds are multicellular organisms which are of a round shape.

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Yeast vs. Molds

Both yeast and mold are types of fungi. Although both have the same similar characteristics, both have many differences also. Both are eukaryotes, having a well-defined nucleus with nuclear membrane and well defined cellular organelles. Yeast is a unicellular organism, in the kingdom fungi which is filamentous shaped while molds are multicellular organisms under kingdom fungi which are rounded or oval shaped.

Yeast reproduces by the asexual method of reproduction, i.e., by budding, sporing, or by simple division (mitosis) while molds reproduce both by the sexual and asexual method. Yeast is able to grow both in an aerobic and anaerobic environment while molds cannot grow in an anaerobic environment. They need oxygen for their growth.

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Yeast is usually white (colorless) and has a smooth surface. Molds are of many colors, i.e., brown, purple, pink, orange, green, black). They are fuzzy and wool like on touch. Yeast has 1500 subtypes which are used for many industrial purposes  while there are almost 400,000 types of molds which are also used in industry. Yeast does not have spores while molds do have. Yeast does not have true hyphae while molds have true hyphae. Hyphae are microscopic filaments.

Yeast is threadlike in structure (filament shaped) while molds are oval or rounded. Yeast is used for the baking purpose in industry, in alcohol formation, as additives and food beverages. Molds are used in food production, for cheese making, biodegradation and in making antibiotics. Yeast is commonly found on the skin of mammals and in fruits and vegetables while molds are commonly found in moist and dark places or in damp.

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Yeast causes many diseases in the body like inflammatory bowel disease. Many patients, whose airways are hypersensitive to yeast, may develop asthma. Molds also cause respiratory problems. Some persons may develop allergies from it.

Comparison chart

Basis Yeast Molds
Definition It is a unicellular organism which usually threads or filamentous shaped.They appear rounded shaped or oval shaped. They are multicellular organisms.
Color They are colorless.They have multiple colors, i.e., red, green, blue, orange, etc.
Number of species discovered Their 1500 types have been discovered till now.There 40,000 species have been discovered till now.
Found in They are found on the skin of mammals, in fruits and vegetables and some other places.They are found in dark, moist or dumpy places. They are also found in the areas which are filled with steam.
Use in industry They are used in the synthesis of alcohol and other beverages, as food additives and for other purposes in industry.They are used in industry for cheese production, rennet, salami,ey h making antibiotics and in biodegradation processes.
Health hazards If they attack human beings, cause many health hazards like asthma, inflammatory bowel disease, skin infections, scalp infection, and genital tract diseases.Molds mostly involve the respiratory tract. Some persons have a genetic tendency to be allergic to them, and they develop asthma. They also cause skin rashes and allergies, mouth infection, oral thrush, vaginal thrush, and athletes foot.
Grow in which environment They have the ability to grow in both aerobic and anaerobic environment.They grow only in the aerobic environment. They cannot grow in the absence of oxygen.
Spore production They do not have spores.They produce spores.
Hyphae They do not have true hyphae.They have true hyphae which are microscopic filaments.
Mode of reproduction They reproduce asexually by mitosis, commonly by  budding and binary fission.They reproduce by asexual and sexual methods. Asexual methods include mitosis, spores formation, and budding.
Treatment If the infection with yeast occurs, it is treated with conventional antifungal drugs, i.e., nystatin, fluconazole, ketoconazole, clotrimazole, amphotericin B, etc.They are also treated with conventional antifungal drugs like fluconazole, ketoconazole, nystatin, amphotericin B, etc. In the case of asthma, bronchodilators and anti-allergic medicines are also given.

What is Yeast?

Yeast is a type of fungi which are a unicellular organism, colorless and thread-like or filamentous shaped in appearance. They do not contain true hyphae, rather they have a type of pseudo-hyphae, and they are non-spore forming fungi. They reproduce by asexual mode of reproduction which includes binary fission and budding. In binary fission, as the name indicates, a cell is simply divided into two daughter cells by simple mitosis. In budding, a bud appears on the cell. Genetic material replicates itself, and a daughter nucleus is formed which moves in the bud. Ultimately the bud is separated which is now the new yeast. Almost 1500 species of yeast have been identified yet. It is found in vegetables, fruits, on the skin of humans and other mammals and at some other places. They can grow in both aerobic and anaerobic environment.

What are Molds?

Molds are also a type of fungi which are rounded to oval shaped and reproduce by both asexual and sexual mode of reproduction. If they reproduce by the sexual method, they do so by meiosis, and genetic variability in the next generation takes place. Asexual reproduction occurs by spore formation and budding. They have true filament shaped hyphae and spores.  Almost 40,000 species of molds have been identified yet, and they are found in dark, dusky and damp filled places. They achieve their nutrients by decomposing the organic waste material present around them, and thus they act as natural decomposers of the environment. They have widespread use in industry in making antibiotics like penicillin, cyclosporin and cheese production. They can cause allergic disorders like asthma, skin disorders and respiratory diseases in humans. They are treated with conventional antifungal drugs.

Key differences

  1. Yeast is unicellular and thread-like organisms while molds are multicellular and rounded shape organisms. Both are types of fungi.
  2. Yeast reproduces by asexual mode of reproduction while molds reproduce by both sexual and asexual methods.
  3. Yeast is found in vegetables, fruits and on the skin of other animals while molds are found in dark places and damp.
  4. Yeast is colorless while molds are found in many colors like red, green, blue, orange.
  5. Yeast has almost 1500 species while molds have 40,000 species discovered yet.
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Yeast and molds are two important types of fungi which are also pathogenic for human beings. It is important for biology students to know the differences between both types. In the above article we learned the clear differences between yeast and molds.

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