1. First, put a proper amount of dry yeast powder in water with a temperature of 37 degrees and stir it with chopsticks until it is fully dissolved.

2. Then add flour to it and stir it while adding it, and stir it with chopsticks until it is lumpy.

3. Knead the dough by hand, and then apply a little water on the surface to prevent it from drying out. Cover with a damp cloth and let it stand in a warm place. When the volume becomes larger and there are a lot of small bubbles in the surface, it can be done.

4. Put a small amount of flour and continue to knead the dough until the surface is smooth, then you can cut the dough to make steamed buns.

5. Finally, put the prepared pasta into the steamer for half an hour, and then steam it.

Basic information

Yeast is a commonly used eukaryotic receptor cell in gene cloning experiments, and it is as convenient to cultivate yeast as Escherichia coli. There are many kinds of yeast cloning vectors.

Yeast also has plasmids. This 2μm long plasmid is called 2μm plasmid, which is about 6 300bp. This plasmid exists outside the chromosome in the nucleus for at least a period of time, and a shuttle plasmid that can shuttle between bacteria and yeast cells can be constructed by using the 2μm plasmid and the plasmid in Escherichia coli. Yeast cloning vectors are all constructed on this basis.