1. Yeasts are larger than bacteria. Yeasts have a nucleus, but bacteria do not have a nucleus, only nucleoids, which is the nuclear region.
2. If the yeast is teething and reproducing, you can clearly see the buds emerging from the bacteria.
3. Some bacteria have flagella, but yeast do not. The most obvious thing is that yeast has a nucleus and bacteria have no cells.
Currently it is known that very few yeasts are classified into the phylum Ascomycota. Yeast is widely distributed in nature and mainly grows in acidic, moist and sugary environments. In February 2018, the precise customized synthesis of yeast long chromosomes was awarded the Ministry of Science and Technology's Top Ten Scientific Progress in China in 2017.
The width (diameter) of yeast cells is about 2~6μm, and the length is 5~30μm, and some are longer. The individual shapes include spherical, oval, elliptical, columnar and sausage-shaped.
The colony characteristics of most yeasts are similar to those of bacteria, but they are larger and thicker than bacterial colonies. The surface of the colony is smooth, moist, sticky, and easy to stir up. The texture of the colony is uniform, and the front and back sides, edges, and center are The colors are very uniform, most of the colonies are milky white, a few are red, and some are black.
Extended information:
Budding: This is the main way for yeast to reproduce asexually. Mature yeast cells first grow a small bud. When the bud cell grows to a certain extent, it separates from the mother cell and continues to grow, and then forms a new individual. There are one-end buds, two-end buds, three-end buds and multiple-end buds.
Fission: A few species of yeast, like bacteria, reproduce by horizontal cell division.
Bud splitting: The mother cell always buds at one end and forms a septum at the base of the bud, and the daughter cells are bottle-shaped. There are very few this way.
Ascospores: When the nutritional status is poor, some yeasts capable of sexual reproduction will form spores (generally four) and germinate when conditions are suitable. Some yeasts, such as Candida, cannot reproduce sexually.
Baidu Encyclopedia—Yeast