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Nutrition

Like other living organisms, yeast needs similar nutrients. Like bacteria, it has an intracellular and extracellular enzyme system, which is used to break down macromolecules into small molecules that are easy to use in cell metabolism.

Acidity

Yeasts can grow in a range of PH between 3.0 and 7.5, with an optimum PH between 4.5 and 5.0.

Moisture

Like bacteria, yeast must have water to survive, but yeast needs less water than bacteria, and some yeasts can grow in environments with very little water, such as honey and jam, suggesting they have a fairly high tolerance for osmotic pressure.

The temperature

Below the freezing point of water or higher than that of 47 ℃ temperature, yeast cells can grow commonly, the optimum growth temperature in the 20 ~ 30 ℃ in general.

Oxygen

Yeast can grow in both aerobic and anaerobic environments, that is, yeast is a facultative anaerobe. In aerobic conditions, it breaks down sugars into carbon dioxide and water, and yeast grows faster.In the absence of oxygen, yeast breaks down sugar into alcohol and carbon dioxide.

Use

The most commonly referred to yeast is Saccharomyces cerevisiae, which has been used to ferment bread and liquor for thousands of years, releasing carbon dioxide into the dough as it ferments bread and bread.

Because yeast is a simple monocyte eukaryote, easy to culture and grow rapidly, it is widely used in modern biology research.As an important model organism, saccharomyces cerevisiae is also an important research material in genetics and molecular biology.

Yeast contains circular DNA- plasmids that can be used as carriers of genetic engineering.