List of top Dairy Science Questions on Introduction to Dairy Microbiology

Given below are two statements:
Statement (I): The presence of antibiotics in milk can deactivate the starter culture activity.
Statement (II): However, there is no effect of detergents in milk on starter culture activity.
In light of the above statements, choose the most appropriate answer from the options given below.

Which of the following characteristics of a plasmid is not true?
(A). Loss of plasmids can lead to the death of bacterial cells.
(B). Plasmids can code for important characteristics such as antimicrobial resistance.
(C). Plasmids are extrachromosomal DNA.
(D). Plasmids cannot move from one bacterial cell to another.
Choose the correct answer from the options given below:

Which among the following statements are true?
(A). Probiotics should be acid tolerant.
(B). Probiotics should be safe and non-pathogenic.
(C). All probiotic strains are Gram-positive.
(D). Probiotic strains should have strong adhesion capacity in the gastro-intestinal tract.
Choose the correct answer from the options given below:

Which starter culture types among the following are usually resistant to bacteriophage attack?
(A). Single strain starters
(B). Multipile strain starters
(C). Mixed strain starters
(D). Artisanal Starters
Choose the correct answer from the options given below:

Given below are two statements:
Statement (I): Paneer is a lactic acid-fermented, coagulated milk product.
Statement (II): Paneer do not require storage at refrigeration temperature.
In light of the above statements, choose the most appropriate answer from the options given below.

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): Probiotics are beneficial microorganisms.
Reason (R): All Lactobacillus strains are probiotics.
In light of the above statements, choose the correct answer from the options given below.

The Natural Process by which genes can be exchanged between bacterial population is
(A). Conjugation
(B). Transduction
(C). Transformation
(D). Protoplast fusion
Choose the correct answer from the options given below:

Which among the following are homofermentative lactic acid bacteria?
(A). Lactobacillus acidophilus
(B). Lactococcus lactis
(C). Leuconostoc mesenteroides
(D). Enterococcus faecalis
Choose the correct answer from the options given below:

Yakult is a probiotic drink originally from ________________ country.

Which of the following bacterial pathogens are associated with the consumption of ice cream?
(A). Bacillus cereus
(B). Salmonella
(C). Listeria monocytogenes
(D). Lactobacillus planterum
Choose the correct answer from the options given below:

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): ISO 22000: 2018 is a Food Safety management System applicable to all food industry
Reason (R): ISO 22000: 2018 is combination of ISO 9001 and HACCP system
In light of the above statements, choose the correct answer from the options given below.

What is the common source of bacteriophages in dairy industry?

Which of the following bacteria used as an index organisms for Milk sterilization?

Which of the following are known to be psychrotropic molds?
A. Alternaria and Stempylium
B. Mucor and Alternaria
C. Phoma and harmodendrum
D. Aspergillus and Penicillium
Choose the correct answer from the options given below:

Match List-I with List-II
List-I (Selective isoaltion/ growth medium for pathogens/ Hygiene microbes) :
(A). Ottaviani Agosti Medium
(B). Deoxycholate agar
(C). Xylose lysine deoxycholate agar
(D). Yeast extarct glucose Chlorempenicol agar
List-II (Name of the bacterial pathogens/ hygiene microbes) :
(I). Yeast and molds
(II). Listeria monocytogenes
(III). Shigella spp
(IV). Salmonella spp
Choose the correct answer from the options given below:

Drying of milk in to powder shifts the \(\beta/\alpha\) ratio to _____________

Which of the following is true about the catalase test when used to differentiate between streptococci and staphylococci?

Why are spore-forming bacteria a particular concern in raw milk?

Which of the following bacterial metabolites are responsible for "fruity" off-flavor in raw milk?

Which of the following organisms is most likely to cause lipolysis in milk?

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : The Lactoperoxidase (LP) system in raw milk utilizes water and thiamin to generate free radicals
Reason (R) : Free radicals formed by the LP system act by damaging bacterial cell membranes and disrupting essential cellular processes, thereby inhibiting bacterial growth.
In light of the above statements, choose the correct answer from the options given below:

Which enzyme found in raw milk is known for its antibacterial properties and ability to disrupt bacterial cell walls?

Which of the following types of bacteria does Pseudomonas belong to?