The width (diameter) of yeast cells is about 2~6 mm, and the length is 5~30 mm.
Yeast is a single-celled microorganism.It belongs to the fungi of higher microorganisms.Like the cells of higher plants, it has the nucleus, the cell membrane, the cell wall, the mitochondria, the same enzymes and metabolic pathways.Yeast is harmless and easy to grow. It is found in air, soil, water and animals.You can survive with or without oxygen.
Yeast is a facultative anaerobic organism. No obligate anaerobic yeast is found. In the absence of oxygen, fermentative yeast obtains energy by converting sugars into carbon dioxide and ethanol (commonly known as alcohol).
Most yeast can be isolated from sugar-rich environments, such as some fruits (grapes, apples, peaches, etc.) or plant secretions (such as cactus juice).Some yeasts live in insects.Yeast is a monocyte eukaryotic microorganism, which is usually spherical, ovoid, salami shaped, elliptic, lemon shaped or lotus knot shaped, and so on.Yeast has no flagella and cannot swim.Yeast has typical eukaryotic cell structure, including cell wall, cell membrane, nucleus, cytoplasm, vacuole, mitochondria, and some have microbodies.
The genetic material of yeast: nuclear DNA, mitochondrial DNA, and special plasmid DNA.
The colony features of most yeasts are similar to the bacteria, but larger and thicker than the bacteria colony. The colony surface is smooth, moist and sticky, easy to pick up, and the texture of the colony is uniform, and the color of the front and back sides, edges and central parts are all uniform. The colonies are mostly milky white, a few red, and some black.
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