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.
No. Being that viruses are not a living organism, they are neither contain cells, nor are they a cell themselves. Viruses are merely few macromolecules (such as nucleic acid and protein) which combines to form a pathogenic particle.dit: a cell wall-as the name implies-is a part of a cell. Viruses are not cells. â¦ Cells are living, viruses are not.
The size majority of viruses range between 10 to 300 nanometers. The structure of a virus cell, known as a virion (as discussed above, viruses do not have a cellular structure) is quite interesting to study.A single virion is composed of an outer coat of protein, which is called capsid, enclosing nucleic acid within it.hether a virus is a proper life form or organism is a topic of much debate. There are several reasons behind such contradictory opinions. Although viruses have genes and undergo evolution by natural selection, they do not reproduce by cell division as they do not possess a cellular structure.