18 Questions
What is the major product formed by Lactic Acid Bacteria (LAB) during fermentation of carbohydrates?
Lactic Acid
Which of the following genera are NOT typically associated with Lactic Acid Bacteria (LAB)?
Acetobacter
What is the primary use of Lactic Acid Bacteria (LAB) in food preservation?
Fermentation of carbohydrates to produce lactic acid
Which of the following is a characteristic of Lactic Acid Bacteria (LAB)?
Producing relatively large quantities of lactic acid from carbohydrates
What is the main difference between Lactic Acid Bacteria (LAB) and Acetic Acid Bacteria?
The type of acid produced during fermentation
Which of the following is NOT a genus associated with Lactic Acid Bacteria (LAB)?
Microbacterium
What characteristic differentiates Propionic Acid Bacteria from other bacterial groups, and what is a notable example of a species in this group?
High lipolytic activity; Propionibacterium.
What is the structural formula for butyric acid, and which bacterial group is characterized by producing this compound?
CH₃CH₂CH₂-COOH; Butyric Acid Bacteria.
What is the primary distinction between Proteolytic Bacteria and Lipolytic Bacteria, and what genera are commonly associated with these groups?
Proteolytic bacteria hydrolyze proteins, while lipolytic bacteria hydrolyze triglycerides; Proteolytic: Micrococcus, Staphylococcus, Bacillus; Lipolytic: Flavobacterium, Alteromonas, Micrococcus, Pseudomonas, Staphylococcus.
Which bacterial group is capable of hydrolyzing complex carbohydrates, and what is a common trait among bacteria in this group?
Saccharolytic Bacteria; they are able to hydrolyze complex carbohydrates.
What characteristic do Lactic Acid Bacteria share with Propionic Acid Bacteria and Butyric Acid Bacteria, and what are some important genera associated with Lactic Acid Bacteria?
They are all able to hydrolyze complex molecules; Lactococcus, Leuconostoc, Pediococcus, Lactobacillus, and Streptococcus thermophilus.
What is the significance of the high lipolytic activity exhibited by Propionic Acid Bacteria, and how does this trait impact their utility?
High lipolytic activity makes them valuable for producing metabolites used as preservatives; this characteristic makes them useful in various applications.
What is the characteristic temperature range for the growth of thermophilic bacteria?
Above 50°C
Which group of bacteria are able to survive pasteurization temperature treatment?
Thermoduric Bacteria
What is the characteristic of halotolerant bacteria?
Able to survive high salt concentrations (less than or equal to 10%)
Which bacteria are able to break down sugar products?
Saccharolytic Bacteria
Which type of bacteria are Lactobacillus and Bacillus classified as?
Thermophilic and Thermoduric
What is the characteristic of psychrotrophic bacteria?
Able to grow at refrigerated temperature (0°C) and have a maximum growth temperature above 20°C
Test your knowledge of Propionic Acid Bacteria and Butyric Acid Bacteria, including their characteristics, metabolites, and species. Learn about the properties of these bacteria and their applications.
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