Microbiology

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Q. Aeromonas hydrophila is most commonly associated with which type of infection?
  • A. Respiratory infections
  • B. Gastroenteritis
  • C. Skin and soft tissue infections
  • D. Urinary tract infections
Q. Astroviruses are primarily associated with which type of illness?
  • A. Respiratory infections
  • B. Gastroenteritis
  • C. Hepatitis
  • D. Meningitis
Q. Burkholderia mallei is the causative agent of which disease?
  • A. Melioidosis
  • B. Glanders
  • C. Tularemia
  • D. Brucellosis
Q. During DNA replication, which direction does the DNA polymerase synthesize the new strand?
  • A. 5' to 3'
  • B. 3' to 5'
  • C. Both directions
  • D. Randomly
Q. During transcription, which strand of DNA serves as the template?
  • A. Coding strand
  • B. Non-coding strand
  • C. Both strands
  • D. Neither strand
Q. How do bacteriophages replicate?
  • A. Binary fission
  • B. Budding
  • C. Lytic and lysogenic cycles
  • D. Mitosis
Q. How does phosphorylation affect translation?
  • A. It always enhances translation
  • B. It can inhibit or enhance translation depending on the context
  • C. It has no effect on translation
  • D. It only affects transcription
Q. How long can opened canned foods be safely stored in the refrigerator?
  • A. 1-2 days
  • B. 3-5 days
  • C. 1 week
  • D. 2 weeks
Q. What are Okazaki fragments?
  • A. Short DNA segments on the leading strand
  • B. Short DNA segments on the lagging strand
  • C. RNA primers
  • D. Mutated DNA segments
Q. What are the three main steps of the PCR cycle?
  • A. Denaturation, annealing, extension
  • B. Denaturation, transcription, translation
  • C. Annealing, elongation, termination
  • D. Denaturation, replication, repair
Q. What compound in tomatoes is linked to reduced cancer risk?
  • A. Lycopene
  • B. Beta-carotene
  • C. Vitamin C
  • D. Fiber
Q. What effect does a competitive inhibitor have on enzyme activity?
  • A. Increases Vmax
  • B. Decreases Km
  • C. Increases Km
  • D. Decreases Vmax
Q. What effect does increasing substrate concentration have on enzyme activity, up to a certain point?
  • A. It decreases enzyme activity
  • B. It has no effect
  • C. It increases enzyme activity until saturation
  • D. It permanently denatures the enzyme
Q. What enzyme is crucial for the replication of Retroviridae viruses?
  • A. DNA polymerase
  • B. RNA polymerase
  • C. Reverse transcriptase
  • D. Ligase
Q. What happens to an enzyme when it is denatured?
  • A. It becomes more active
  • B. It loses its functional shape
  • C. It increases its substrate affinity
  • D. It becomes a cofactor
Q. What is a bacteriophage?
  • A. A type of bacteria
  • B. A virus that infects bacteria
  • C. A fungal organism
  • D. A type of antibiotic
Q. What is a cofactor in enzyme reactions?
  • A. A type of substrate
  • B. A non-protein molecule that assists enzyme function
  • C. An inhibitor of enzyme activity
  • D. A product of the enzyme reaction
Q. What is a common allergen found in shellfish?
  • A. Gluten
  • B. Lactose
  • C. Tropomyosin
  • D. Casein
Q. What is a common consequence of a frameshift mutation?
  • A. No effect on protein function
  • B. A premature stop codon
  • C. A single amino acid change
  • D. Increased DNA replication speed
Q. What is a common feature of Enterobacteriaceae?
  • A. They are anaerobic bacteria.
  • B. They ferment lactose.
  • C. They are spore-forming.
  • D. They are obligate parasites.
Q. What is a common foodborne illness caused by Bacillus cereus?
  • A. Botulism
  • B. Salmonellosis
  • C. Staphylococcal food poisoning
  • D. Emetic toxin syndrome
Q. What is a common laboratory method to identify Actinomycetes?
  • A. Gram staining
  • B. Acid-fast staining
  • C. Culture on blood agar
  • D. PCR amplification
Q. What is a common method by which aquatic microbes contribute to nutrient cycling?
  • A. Photosynthesis
  • B. Nitrogen fixation
  • C. Fermentation
  • D. Respiration
Q. What is a common method for sterilizing cell culture media?
  • A. Autoclaving
  • B. Filtration
  • C. Chemical sterilization
  • D. All of the above
Q. What is a common source of Streptococcus pneumoniae infection?
  • A. Contaminated water
  • B. Airborne droplets
  • C. Foodborne transmission
  • D. Vector-borne transmission
Q. What is a common symptom of acute hepatitis infection?
  • A. Jaundice
  • B. Weight gain
  • C. Increased appetite
  • D. Hair loss
Q. What is a common symptom of rabies infection?
  • A. Fever and chills
  • B. Severe headache
  • C. Hydrophobia
  • D. Nausea and vomiting
Q. What is a common treatment for viral infections?
  • A. Antibiotics
  • B. Antivirals
  • C. Vaccines
  • D. Surgery
Q. What is a key characteristic of Plesiomonas shigelloides?
  • A. It is a Gram-positive bacterium
  • B. It is primarily found in freshwater
  • C. It causes respiratory infections
  • D. It is resistant to all antibiotics
Q. What is a key characteristic of Pseudomonas aeruginosa?
  • A. Gram-positive cocci
  • B. Obligate anaerobe
  • C. Produces a blue-green pigment
  • D. Non-motile
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