Mold vs Yeast

We have all seen some or the other sort of mold, be it on stale loaves of bread or on walls and ceilings during prolonged rainy weather. Yeast is also something that most of us are aware of, many of us have even used it for culinary purposes, haven't we? Well, since both of these fungi types are so familiar to us, albeit on a superficial level, let's dig a little deeper to find out more about mold and yeast, including their individual characteristics as well as the distinctive features that set mold vs yeast apart. So, let's begin our journey towards identifying the differences between mold and yeast by first going through facts and information on each one of these organisms.

Mold

Molds belong to the fungus family. Mold colonies and growths are clearly visible to the naked eye and are composed of multiple cells. This is one of the major differences between yeast and molds, as yeasts are unicellular organisms. Molds are structured as hyphae which means they have the same branching structure of filaments that are found in most fungi that multiply through vegetative reproduction. Molds usually occur as colonies of tubular hyphae that contain a large number of nuclei that have the same genetic structure and composition. Each such colony is recognized as one single organism. Although biologically closer to plants than animals, molds cannot undergo the process of photosynthesis to derive nutrition. They have to rely upon organic matter for such purpose. That is the reason why we see mold growing on organic hosts, mostly dead or decaying. Molds produce spores which can remain airborne or cling to other particles infinitely, till they chance upon a favorable breeding ground. Mold reproduce using both sexual and asexual reproduction methods. The ideal breeding environment for molds is moist, humid places containing organic matter, stashed away from strong lights and dry weather conditions. Some mold species are used for production and processing of various food items like Stilton cheese, soy sauce, tempeh, etc.

Yeast

Yeasts also belong to the fungus family of eukaryotic organisms. As opposed to molds, yeast are unicellular structures. Most yeasts reproduce asexually, either by the formation of new organisms on the existing one by way of budding or by undergoing the reproductive process of binary fission where a single organism divides into two separate, identical entities. Both, yeast and mold require organic hosts to derive nutrition from. Yeasts find widespread use in food preparation and processing due to their ability to break down carbohydrates and cause fermentation. Breweries and distilleries where alcoholic beverages are produced, use yeasts on a large scale, so do bakeries. For more information on yeast and related matters, check out the following links:-

• Types of Yeast Infections
• Health Benefits of Brewer's Yeast

Difference Between Molds and Yeast

Although belonging to the fungus kingdom, there are a few points of difference with relation to mold vs yeast that set mold and yeast apart from each other. Let's take a look at these differentiating factors.

Point of Distinction	Mold	Yeast
Structure	Multicellular with tubular, filamentous hyphae (branches)	Mostly unicellular and existing either individually or with buds growing on them
Predominance of Occurrence	Any organic environment having a moist/humid atmosphere and not exposed to harsh weather conditions	Mostly occur naturally in oceans
Method of Reproduction	Production of sexual or asexual, airborne spores	Budding or binary fission
Appearance	Threadlike, come in a wide variety of colors and hues	Round or oval-shaped, dull colored and mostly monochromatic

Those were the chief differences with regards to mold vs yeast. Not all molds are harmful and a few species of molds have actually benefited mankind, like Penicillium chrysogenum from which the antibiotic drug Penicillin was developed by Alexander Fleming. Likewise, yeast is widely used for the production of alcoholic beverages and many baked food items. However, the possibility of fungal infections and allergic reactions from both of these fungi types are equally present. Knowing more about the various species of yeast and mold are the best way to avoid the harmful ones and nurturing beneficial ones.