barm - a commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey. yeast. yeast cake - small cake of compressed moist yeast. brewer's yeast - yeast used in fermenting beer. leaven, leavening - a substance used to produce fermentation in dough or a liquid. mother - a stringy slimy substance consisting of yeast cells and bacteria; forms during fermentation and is added to cider or wine to produce vinegar.
1 Viruses, on the other hand, do not have any cells. 2  Viruses are made up of a protein structure called a capsid. 3  Though this capsid contains the virus's genetic material, it lacks the features of a true cell, such as cell walls, transport proteins, cytoplasm, organelles, and so on. Viruses, on the other hand, do not have any cells. 2  Viruses are made up of a protein structure called a capsid. 3  Though this capsid contains the virus's genetic material, it lacks the features of a true cell, such as cell walls, transport proteins, cytoplasm, organelles, and so on.
Report Abuse. A virus is a small, non-living particle that invades cells of living organisms. Once in the cell, a virus uses the cell to make more of itself. A virus is considered a parasite-an organism that lives off of and harms another organism.The cell in which a virus lives is called the host. Viruses are considered non-living because they do not use energy to grow or to respond to their surroundings. virus is a non-living organism because (going back to the characteristics of living organisms) Living things reproduce, viruses replicate. Living things grow, viruses replicate. K Â· 7 years ago. Thumbs up. 1. Thumbs down. 0. Comment. Add a comment. Submit.