Micro Quizzes Flashcards
Lager yeast, Saccharomyces pastorianus is most likely a hybrid between S. cerevisiae and what other species?
S. bayanus ( S. eubayanus)
What is the general term for the perfect (sexual) form of yeasts?
Teleomorph
What two macromolecules primarily make up the cell membrane?
- lipids and polysaccharide ;
- protein and nucleic acids ;
- polysaccharide and protein;
- lipids and protein ;
lipids and protein
What term best describes most brewing yeast?
- haploid ;
- diploid ;
- monoploid ;
- aneuploid ;
aneuploid
What sugar do zymolectins bind during flocculation?
mannose
Lager and ale yeast can be distinguished based on their ability to utilize which disaccharide?
melibiose
What polysaccharide is found in bud scars?
chitin
ρ- and ρ0 phenotypes are both petite mutants. What DNA is altered or missing in these mutants?
mtDNA
True or false:
Promitochondria exhibit no metabolic activity.
False
The mating types of yeast are called what?
a and alpha
Which kind of yeast is it possible to bottom crop with?
- lager yeast;
- neither lager yeast nor ale east ;
- both lager yeast and ale yeast ;
- ale yeast;
both lager yeast and ale yeast
Higher aspect ratio in a cylindroconical fermenter is associated with which of the following?
- more vigorous CO2 agitation
- increased temperature
- lower fusel alcohol formation
- lower hydrostatic pressure
more vigorous CO2 agitation
What conditions are required for passivation of stainless steel?
- high chloride concentration
- oxic and acidic
- anoxic and acidic
- aerobic and acidic
oxic and acidic
Why aren’t spherical tanks used very much?
- They’re difficult to construct
- They don’t have convection currents
- They don’t stand up to pressure well
- The aspect ratio is too high
They’re difficult to construct
From what material were the first cylindroconical fermentors constructed?
- copper
- aluminum
- glass
- stainless steel
aluminum
