LAB

Question 1

How is lactic acid produced?

Answer 1

breakdown of simple carbohydrates by lactic acid bacteria

Question 2

What are other names for lactic acid?

Answer 2

milk acid, 2-hydroxypropanoic acid

Question 3

what are the 2 classes of lactic acid bacteria

Answer 3

homofermentative, heterofermentative

Question 4

homofermentative

Answer 4

• produce two moles of lactate from one mole of glucose, produces 2 ATP
• use the glycolytic pathway

Question 5

heterofermentative

Answer 5

• produce one mole of lactate from one mole of glucose, carbon dioxide, and acetic acid or ethanol. Produces 1 ATP
• use the 6-PG/PK pathway

Question 6

Characteristics of LAB

Answer 6

• gram positive
• produce lactic acid during the fermentation of carbohydrates
• rods or cocci
• non-sporeforming
• commonly found in healthy mucosal surfaces

Question 7

Preferable environments

Answer 7

high nutrient and vitamins, have a high acid tolerance (cuz they produce acid)

Question 8

examples of LAB

Answer 8

Enterococcus, Lactobacillus, Lactococcus, Leuconostoc, Streptococcus