2006-07-20 08:49:34 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Yeasts
Yeasts are members of a higher group of microorganisms called fungi . They are single-cell organisms of spherical, elliptical or cylindrical shape. Their size varies greatly but are generally larger than bacterial cells. Yeasts may be divided into two groups according to their method of reproduction:
budding: called Fungi Imperfecti or false yeasts
budding and spore formation: called Ascomycetes or true yeasts
Unlike bacterial spores, yeast form spores as a method of reproduction.
Moulds
Moulds are filamentous, multi-celled fungi with an average size larger than both bacteria and yeasts (10 X 40 µ m). Each filament is referred to as a hypha. The mass of hyphae that can quickly spread over a food substrate is called the mycelium. Moulds may reproduce either asexually or sexually, sometimes both within the same species.
Asexual Reproduction:
fragmentation - hyphae separate into individual cells called arthropsores
spore production - formed in the tip of a fruiting hyphae, called conidia, or in swollen structures called sporangium
Sexual Reproduction: sexual spores are produced by nuclear fission in times of unfavourable conditions to ensure survival
2006-07-20 09:07:02 · answer #1 · answered by qwq 5 · 1⤊ 0⤋
I'm not sure, but it must be very fast. I'm basing this on the recipe for amish friendship bread. it takes 10 days to make, then you divide the dough with yeast into 4 parts...each of which takes another 10 days before dividing it again. the yeast keeps reproducing at the rate til you stop adding additional ingredents for it to eat.
2006-07-20 08:54:14 · answer #2 · answered by lexie 6 · 0⤊ 0⤋
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2016-07-02 15:50:15 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Well if it's given yeast nutrient and kept at the right temperature then I've seen those little blighters going through 6 kilos of sugar in 4 days. Lol, see if thye're given too much sugar? then they become drunk. That's funny.
2006-07-20 08:53:01 · answer #4 · answered by Put_ya_mitts_up 4 · 0⤊ 0⤋
Doubling time of Saccharomyces is 1-2 hours I think. Depends on the strain and the carbon source.
2006-07-20 08:56:55 · answer #5 · answered by Franklin 7 · 0⤊ 0⤋
Doesn't it depend on the conditions? Warm, moist conditions being ideal.
2006-07-20 08:53:18 · answer #6 · answered by smartypants909 7 · 0⤊ 0⤋