Q109: Which of the following are homofermentative lactic acid bacteria? (A).... - Starter Cultures and Probiotics - Dairy Microbiology- ICAR JRF/SRF 2024 | Agrigyan

General Agriculture Scope and History of Microbiology Microbial Genetics Microbiological Quality of Milk Microbiology of Processed Foods Starter Cultures and Probiotics Quality Assurance Fermentation Technology
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Dairy Microbiology- ICAR JRF/SRF 2024
MCQ (Single Correct)

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

Dairy Microbiology Subjects

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General Agriculture

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Agronomy, Tillage & Field Crop Production Agricultural Entomology, Nematology & Crop Protection Soil Science, Plant Nutrition & Reclamation Cell Biology, Plant Physiology & Biochemistry Agricultural Meteorology & Climate Science Crop Genetics, Plant Breeding & IPR

Scope and History of Microbiology

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Bacterial Cell Ultrastructure: Peptidoglycan Architecture, Teichoic Acids & Periplasmic Transport Microbial Energetics & Membrane Transport: PEP-PTS Systems, ABC Transporters & PMF Microscopy in Dairying: Light, Fluorescence, Confocal, SEM, TEM & Specimen Preparation Microbial Taxonomy & Phylogeny: Polyphasic Taxonomy & 16S rRNA Molecular Classification Bacterial Growth Kinetics: Growth Phases, Specific Growth Rate, Generation Time & Chemostats

Microbial Genetics

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Recombinant DNA Technology, PCR Primers & Metagenomics: DGGE & Amplicon Sequencing Molecular Genetics of Dairy Microorganisms: Central Dogma, Replication, Transcription & Translation Mutation & DNA Repair: Missense, Nonsense, Frameshift Mutations & Excision Repair Systems Horizontal Gene Transfer in Dairy Microbes: Conjugation, Transduction & Transformation Plasmids, Transposons & Phage Resistance: Dairy Plasmids (pSN2, pTRK2030) & Abortive Infection

Microbiological Quality of Milk

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Raw Milk Microflora & Spoilage Dynamics: Succession from Bactericidal Stage to Acidification Milk-Borne Bacterial Pathogens & Zoonoses: Campylobacter jejuni, Listeria, E. coli O157:H7 & S. aureus Thermoduric & Thermophilic Microorganisms: Microbacterium, Sporeformers & 55°C Incubation Dairy Biofilms & Surface Adhesion: EPS Matrix, Quorum Sensing & CIP Sanitation Resistance Microbial Defects in Concentrated & Dried Milks: Mold Buttons, Bloat (Clostridium) & Bitterness Psychrotrophic Microflora & Cold-Chain Spoilage: Pseudomonas Heat-Stable Lipases & Proteases

Microbiology of Processed Foods

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Food Biopreservation: Bacteriocins, Nisin, Pediocin, Mode of Action & GRAS Regulatory Status Radiation Microbiology: Non-Ionizing (UV, IR) vs Ionizing (Gamma, E-Beam) & Radiation Resistance Packaging Microbiology: Modified Atmosphere Packaging (MAP), Active Scavengers & Vacuum Spoilage Hurdle Technology & Intermediate Moisture Foods: Multi-Target Preservation & Homeostasis Milk Protective Systems & Bioactive Peptides: Lactoferrin, LP System & Antimicrobial Peptides

Starter Cultures and Probiotics

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Cheese Microbiology & Ripening Flora: Starter vs NSLAB, Late Gas Defect & Flavor Development Probiotics Selection & Gastrointestinal Survival: Acid/Bile Tolerance (F1F0-ATPase) & FSSAI Standards Flavor Biogenesis in Fermented Milks: Diacetyl, Acetaldehyde (Threonine Pathway) & Acetoin Dairy Yeasts & Molds: Geotrichum candidum, Kluyveromyces & Ripening Fungi Lactic Acid Bacteria (LAB) Taxonomy & Hexose Fermentation: Homofermentative vs Heterofermentative Active Dairy Starter Culture Propagation: Media (Litmus Chalk Milk), Phage Control & Strains

Quality Assurance

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Indicator Organisms of Dairy Sanitation: Total Coliforms, Fecal Coliforms, E. coli & Enterococci Microbiological Sampling Plans & Statistical Standards: Two-Class, Three-Class Plans & FSSAI Limits Rapid Detection & Biosensors in Dairy Microbiology: Optical, SPR, Piezoelectric & Impedance Sensors Commercial Sterility & Aseptic Quality Assurance: Sterility Testing, Incubation Protocols & Spores Biosafety in Dairy Laboratories: Biosafety Levels (BSL-1 to BSL-4) & M. tuberculosis Containment

Fermentation Technology

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Bioreactor Design & Operating Modes: Batch, Fed-Batch, Chemostats & Continuous Fermentation Industrial Dairy Bioproducts & Enzymes: Microbial Rennet, Beta-Galactosidase & Biomass Production Fermentation Pathways & Bioenergetics: Alcoholic, Lactic & Mixed Acid Pathways, Pyruvate Fate Diagnostic Selective & Differential Media: Baird-Parker, XLD, EMB & Biochemical Identifications Solid State (SSF) vs Submerged Fermentation (SmF): Aeration, Energy Consumption & Downstream
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