Micro Quizzes

Question 1

Lager yeast, Saccharomyces pastorianus is most likely a hybrid between S. cerevisiae and what other species?

Answer 1

S. bayanus ( S. eubayanus)

Question 2

What is the general term for the perfect (sexual) form of yeasts?

Answer 2

Teleomorph

Question 3

What two macromolecules primarily make up the cell membrane?

• lipids and polysaccharide ;
• protein and nucleic acids ;
• polysaccharide and protein;
• lipids and protein ;

Answer 3

lipids and protein

Question 4

What term best describes most brewing yeast?

• haploid ;
• diploid ;
• monoploid ;
• aneuploid ;

Answer 4

aneuploid

Question 5

What sugar do zymolectins bind during flocculation?

Answer 5

mannose

Question 6

Lager and ale yeast can be distinguished based on their ability to utilize which disaccharide?

Answer 6

melibiose

Question 7

What polysaccharide is found in bud scars?

Answer 7

chitin

Question 8

ρ- and ρ0 phenotypes are both petite mutants. What DNA is altered or missing in these mutants?

Answer 8

mtDNA

Question 9

True or false:

Promitochondria exhibit no metabolic activity.

Answer 9

False

Question 10

The mating types of yeast are called what?

Answer 10

a and alpha

Question 11

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;

Answer 11

both lager yeast and ale yeast

Question 12

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

Answer 12

more vigorous CO2 agitation

Question 13

What conditions are required for passivation of stainless steel?

• high chloride concentration
• oxic and acidic
• anoxic and acidic
• aerobic and acidic

Answer 13

oxic and acidic

Question 14

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

Answer 14

They’re difficult to construct

Question 15

From what material were the first cylindroconical fermentors constructed?

• copper
• aluminum
• glass
• stainless steel

Answer 15

aluminum

Question 16

What coolant is typically used in a baffled jacket or half-pipe jacket?

Answer 16

propylene glycol

Question 17

what cone angle is most commonly seen in cylindroconical fermentors?

Answer 17

70 degrees

Question 18

Microbes attached to a surface and each other, surrounded by an extracellular polymeric substance (EPS) is called a

Answer 18

biofilm

Question 19

Which of the following vessels has a conical component?

• Asahi vessel
• Rainier unitank
• Burton Union
• Yorkshire square

Answer 19

Rainier unitank

Question 20

Caustic cleaners are effective at disrupting biofilms during clean in place (CIP) because they are :

• acidic
• alkaline
• granular
• enzymatic

Answer 20

alkaline