Brewing Microbiology Flashcards
List 5 factors that influence microbial growth
Oxygen
Ph
Temperature
Nutrients
Moisture
Selective chemicals
What is a microorganism?
Plant or animal of microscopic size
What is a eukaryote?
Cell containing genetic material in a membrane enclosed structure (nucleus)
What is a prokaryote?
Cell lacking a true nucleus
T/F: yeasts, fungi, plants, and animals are eukaryotes
True
In brewing, what is a contaminant?
All microorganisms other than cultured yeast
Where do brewery microbes exist?
Everywhere
What are bacteria?
Single celled prokaryotes
What are the main shapes of bacteria?
Coccus (round)
Rod (cylindrical)
Curved rods (spiral)
Spiral helix
What shape are pediococcus bacteria?
Round (coccus)
What shape are bacilli bacteria?
Rods (lactobacillus)
What is the name of ale yeast?
Saccharomyces cerevisiae
What is the name of lager yeast?
Saccharomyces pastorianus
What are the three types of fungi?
Fusarium, penicillium, aspergillus
Are molds aerobic or anaerobic?
Aerobic