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WorksheetsMIC101 Prelim Review
Total questions: 45
Worksheet time: 23mins
Which of the following best defines microbiology?
The study of viruses and fungi only
The study of microorganisms and their interactions
The classification of bacteria based on shape
The study of microscopic eukaryotic organisms
What is the main function of the cytoplasmic membrane in a bacterial cell?
Acts as a rigid support structure
Separates the cell from its external environment
Houses genetic material
Facilitates binary fission
Which of the following statements is true about microorganisms?
They are the least abundant form of life on Earth
They can only survive in moderate temperatures
Some can live in extreme environments such as hydrothermal vents
They require a host to survive
What is the significance of Koch’s postulates?
They outline bacterial reproduction rates
They establish the connection between microbes and disease
They explain how bacteria develop antibiotic resistance
They describe the process of Gram staining
The study of microbial communities in their natural environment is called:
Microbial genetics
Microbial ecology
Immunology
Virology
Which scientist was responsible for disproving spontaneous generation?
Antonie van Leeuwenhoek
Robert Hooke
Louis Pasteur
Robert Koch
What is the role of microbial bioremediation?
Decomposition of organic waste
Treatment of infectious diseases
Enhancing plant growth
Detoxification of pollutants
Which type of microscopy uses visible light to illuminate specimens?
Electron microscopy
Confocal microscopy
Phase-contrast microscopy
Bright-field microscopy
The ability to distinguish two adjacent objects as separate and distinct is known as:
Magnification
Resolution
Contrast
Refraction
Gram-positive bacteria appear ___ after Gram staining.
Red
Purple
Green
Blue
Which staining method differentiates bacteria based on cell wall composition?
Acid-fast stain
Gram stain
Endospore stain
Capsule stain
Which technique would be best for visualizing the detailed surface structure of a bacterium?
Scanning electron microscopy (SEM)
Transmission electron microscopy (TEM)
Bright-field microscopy
Fluorescence microscopy
The Gram stain differentiates bacteria into two groups based on:
DNA content
Ribosomal RNA sequences
Peptidoglycan thickness
Cell size
Which of the following best describes resident microflora?
Microorganisms that transiently colonize the body
Microorganisms that cause infections in immunocompromised individuals
Microorganisms that permanently inhabit specific body sites
Microorganisms that are introduced through food consumption
The normal flora of the human body primarily functions to:
Inhibit colonization by pathogens
Cause opportunistic infections in all individuals
Prevent antibiotic resistance in bacteria
Stimulate excessive immune responses
Which of the following sites in the human body is normally sterile?
Skin
Upper respiratory tract
Cerebrospinal fluid
Large intestine
What is the most common bacterial genus found in the normal flora of the skin?
Escherichia
Staphylococcus
Lactobacillus
Pseudomonas
Which of the following describes the role of gut microbiota?
Competes with pathogens for nutrients and space
Produces toxins that damage intestinal lining
Inhibits digestion of carbohydrates
Reduces nutrient absorption in the small intestine
Which of the following is an example of an opportunistic pathogen?
Mycobacterium tuberculosis
Neisseria gonorrhoeae
Staphylococcus epidermidis
Clostridium tetani
A disruption in the normal flora due to broad-spectrum antibiotic use can lead to:
Increased immune function
Superinfections such as Clostridioides difficile colitis
Improved nutrient absorption
Enhanced resistance to pathogenic bacteria
Asepsis refers to:
The presence of pathogenic microorganisms
The complete absence of microorganisms
The use of antibiotics to treat infections
The use of antiseptics to cleanse wounds
Which of the following is an example of medical asepsis?
Hand hygiene before a surgical procedure
Use of an autoclave to sterilize instruments
Wearing a sterile gown during surgery
Cleaning a patient’s wound with alcohol
What is the primary goal of surgical asepsis?
To reduce the spread of drug-resistant bacteria
To eliminate all microorganisms, including spores
To disinfect non-living surfaces
To remove toxins from biological specimens
The most effective method for sterilizing surgical instruments is:
Autoclaving
Boiling
Alcohol wipes
Ultraviolet radiation
Which of the following best describes antisepsis?
The destruction of all microbial life forms
The inhibition or destruction of pathogens on living tissue
The sterilization of surgical instruments
The elimination of all organic material from a surface
Which of the following situations requires sterile technique?
Collecting a throat swab for bacterial culture
Assisting a patient with oral hygiene
Performing an open-heart surgery
Taking a blood pressure measurement
Personal protective equipment (PPE) includes all of the following except:
Gloves
Gowns
Face shields
Contact lenses
Which of the following best describes the mechanism of action of β-lactam antibiotics?
Inhibition of DNA replication
Disruption of the bacterial cell membrane
Inhibition of peptidoglycan cross-linking
Interference with protein synthesis
The overuse of broad-spectrum antibiotics can lead to:
Decreased microbial resistance
Increased effectiveness of narrow-spectrum drugs
Disruption of normal flora and increased risk of superinfections
Enhanced immune system function
Which of the following is an example of an antibiotic that inhibits protein synthesis?
Penicillin G
Tetracycline
Ciprofloxacin
Rifampin
What is the primary reason for the development of antibiotic resistance in bacteria?
Random genetic mutations
Excessive use of antiseptics
Increased host immunity
Lack of bacterial adaptation
Which of the following mechanisms contributes to bacterial resistance against β-lactam antibiotics?
Efflux pumps that remove the drug from the bacterial cell
Modification of the 30S ribosomal subunit
Production of β-lactamase enzymes
Increased cell wall permeability
Which of the following best describes vancomycin's mechanism of action?
Inhibition of DNA gyrase
Inhibition of peptidoglycan cross-linking
Disruption of bacterial protein synthesis
Blocking folic acid metabolism
Fluoroquinolones, such as ciprofloxacin, target which bacterial process?
Protein synthesis
Peptidoglycan synthesis
DNA replication
Cell membrane integrity
Which bacterial process is targeted by sulfonamides?
DNA replication
Peptidoglycan synthesis
Folic acid metabolism
Ribosomal function
Which of the following contributes most significantly to the spread of antibiotic resistance genes among bacterial populations?
Binary fission
Horizontal gene transfer
Mutations in the host genome
Decreased bacterial metabolism
A patient with a severe burn wound is showing signs of infection. Laboratory tests indicate Pseudomonas aeruginosa. Which antibiotic would most likely be effective?
Penicillin G
Vancomycin
Polymyxins
Clindamycin
A hospital patient develops a Clostridioides difficile infection after receiving broad-spectrum antibiotics. What is the primary cause of this superinfection?
Contaminated hospital food
Horizontal gene transfer
Disruption of normal gut flora
Excessive hand hygiene
During a surgical procedure, the surgeon notices a sterile instrument has accidentally touched an unsterile surface. What is the best course of action?
Proceed with the surgery and sterilize later
Quickly rinse with alcohol and reuse
Discard the instrument and use a new sterile one
Wipe with a disinfectant wipe and continue
A patient in the ICU is on mechanical ventilation and develops ventilator-associated pneumonia (VAP). What is the most likely causative agent?
Streptococcus pneumoniae
Klebsiella pneumoniae
Neisseria meningitidis
Mycoplasma pneumoniae
A lab technician is performing Gram staining on an unknown bacterial sample. The bacteria appear pink under the microscope. What does this indicate?
The bacteria have a thick peptidoglycan layer
The bacteria have a thin peptidoglycan layer
The bacteria lack a cell membrane
The bacteria are acid-fast
A patient suffering from tuberculosis is prescribed rifampin and isoniazid. What is the primary reason for using a combination therapy?
To speed up the metabolism of the drugs
To decrease host immune response
To prevent the development of drug resistance
To enhance bacterial growth
A surgeon preparing for an open-heart surgery follows a strict aseptic technique. Which of the following practices is most crucial in maintaining sterility?
Wearing non-sterile gloves
Using alcohol wipes only before the procedure
Ensuring all surgical instruments are autoclaved
Keeping doors to the OR frequently open for ventilation
A patient undergoing chemotherapy develops a systemic fungal infection. The organism is resistant to amphotericin B. What is the most likely mechanism of resistance?
Modification of ergosterol synthesis pathway
Increased peptidoglycan cross-linking
Enhanced bacterial capsule formation
Increased secretion of exotoxins
A patient undergoing dialysis presents with a catheter-related bloodstream infection (CRBSI). What is the most probable causative agent?
Candida albicans
Enterococcus faecalis
Staphylococcus epidermidis
Mycobacterium tuberculosis
