Questions and Answers about Yeast:
Ques. Life cycle of yeast is
(a) Haplodiplobiontic
(b) Haplobiontic
(c) Diplobiontic
(d) All of the above
Ques. Oldest cultivated organism yeasts was discovered by
(a) Aristotle
(b) Linnaeus
(c) Leeuwenhoeck
(d) Theophrastus
Ques. Yeast cell divides by
(a) Mitosis only
(b) Mitosis and Amitosis
(c) Endomitosis and Amitosis
(d) Mitosis and Endomitosis
Ques. Yeast is an example of
(a) Bacteria
(b) Virus
(c) Fungi
(d) Algae
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Ques. In manufacture of bread, it becomes porous due to release of CO2 by the action of
(a) Virus
(b) Yeast
(c) Bacteria
(d) Protozoans
Ques. In yeast during budding which process occurs
(a) Synapsis
(b) Unequal division of cytoplasm
(c) Doubling of chromosomes
(d) Spindle formation
Ques. Baker yeast is
(a) S. cerevisiae
(b) S. ludwingai
(c) S. octosporus
(d) Schizosaccharomyces
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Ques. Meiosis occur in yeast in
(a) Ascospores
(b) Ascus mother cell
(c) Ascus
(d) None of the above
Ques. Yeasts cell wall is rich in
(a) Protein
(b) Cellulose
(c) Carbohydrates
(d) Lipids
Ques. Yeast differs from Rhizopus in being
(a) Multicellular and coenocytic
(b) Unicellular and uninucleate
(c) Unicellular and coenocytic
(d) Filamentous
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Ques. Yeast is employed for production of
(a) Curd
(b) Cheese
(c) Acetic acid
(d) Ethyl alcohol
Ques. In Albugo the food reserve is mostly
(a) Glycogen
(b) Volutin granules
(c) Protein granules
(d) Fat
Ques. The antibiotic obtained from the yeast is
(a) Ephedrin
(b) Saccharin
(c) Campestrin
(d) Polymixin
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Ques. In yeast, cell wall contains
(a) Amylose and glucose
(b) Glucose and mannose
(c) Glucose and muramic acid
(d) Sucrose and mannose
Ques. Yeast are economically important because they
(a) Spread plant diseases
(b) Spread animal diseases
(c) Are used in tea and tobacco industry
(d) Are used in wine and baking industry
Ques. Which one is not a mode of reproduction is yeast
(a) Budding
(b) Plasmogamy
(c) Oogamy
(d) Ascospore formation
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Ques. In Yeast the sexual reproduction is by conjugation. After fusion the zygotic nucleus divides meiotically and forms haploid spores. The unicellular structure with haploid spores is
(a) Sporangium
(b) Gametangium
(c) Ascus
(d) Zoosporangium
Ques. Yeast is abundantly found in
(a) Moist bread
(b) Horse dung
(c) Organic substances rich in fats
(d) Organic substances rich in sugar
Ques. Which is used for preparing alcohol
(a) Penicillium
(b) Lactobacillus
(c) Saccharomyces
(d) Acetobacter
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Ques. Yeast is not included in protozoans but in fungi because
(a) It has no chlorophyll
(b) Some fungal hyphae grow in such a way that they give the appearance of pseudomycelium
(c) It has eukaryotic organization
(d) Cell wall is made up of cellulose and reserve food material as starch
Ques. Sometimes, in yeast, the conjugation takes place between a parent cell and a bud. It is called
(a) Isogamy
(b) Syngamy
(c) Pedogamy
(d) Parthenogenesis
Ques. Yeast is important source of
(a) Proteins
(b) Riboflavin
(c) Vitamin C
(d) Sugars
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Ques. Yeast is divided under the class
(a) Basidiomycetes
(b) Deuteromycetes
(c) Ascomycetes
(d) Zygomycetes
Wild yeast vs Commercial yeast:
There are two major types of yeast, wild yeast and commercial baking yeast. Wild yeast produces more carbon dioxide during fermentation, while commercial baking yeast has an alcohol-producing enzyme. The difference in fermentation speed can affect the aroma and taste of a finished product.
How to store yeast?
Fresh yeast must be refrigerated to avoid mold and other growth. The shelf life of fresh yeast is usually two weeks in ideal conditions. Make sure you store your yeast in a clean container and avoid alcohol.
Yeast is best stored in the fridge or freezer. However, it can also be kept at room temperature if you store it in a well-sealed container. Once exposed to the air, active yeast will lose its activity and need to be stored in a refrigerator or freezer for longer periods of time. To preserve yeast, make sure you store it in a tightly closed container before storing it and if you’re worried about yeast being unusable, freeze it.
