MDS PREP
The bacterial population in the gingival sulcus or the pocket that influences the course of periodontal disease has been found to involve
1 bacteria indigenous to the oral cavity
2. essentially a pure culture
3. essentially the same organisms found in the healthy sulcus
4. mostly aerobic bacteria
Microbiology
Answer: 3
The bacterial population in the gingival sulcus or the pocket that influences the course of periodontal disease has essentially the same organisms found in the healthy sulcus
Which of the following statements is true regarding the hemolysis of Bacillus anthracis?
1) Strong hemolysis is observed
2) Hemolysis is absent or weak
3) Complete hemolysis is typical
4) Variable hemolysis depending on the strain
Hemolysis of Bacillus anthracis is typically absent or weak, depending on the strain.
Dry heat sterilization of paper points without incineration is accomplished at
1. 160°C for 2hours
2. 120°C for l hour
3. 100°C for 2 hours
4. 200°C for 1 hour
Microbiology
Answer: 1
Dry heat sterilization of paper points without incineration is accomplished at 160°C for 2hours
What is the typical pH range for optimal growth of meningococci?
1) 6.8-7.0
2) 7.4-7.6
3) 8.0-8.2
4) 7.0-7.2
The optimal pH range for the growth of meningococci is 7.4-7.6.
What type of differentiation is associated with a diphtheria bacilli that ferments glycogen and starch?
1) Gravis
2) Intermedius
3) Mitis
4) Avirulent
Diphtheria bacilli that ferment glycogen and starch are classified as Mitis.
What is the purpose of using aluminum hydroxide as an adjuvant in the hepatitis B vaccine?
1) To increase the immunogenicity of the vaccine
2) To prevent bacterial contamination
3) To enhance the stability of the vaccine
4) To reduce the amount of antigen needed for immunization
General Microbiology Answer: 1
Aluminum hydroxide is used as an adjuvant in the hepatitis B vaccine to increase the immunogenicity of the vaccine, enhancing the body's immune response to the antigen.
The destruction of microorganisms on living tissues, as long as there is contact between the tissues and the antimicrobial agent, denotes
1. sterilization
2. antisepsis
3. sanitization
4. none of the above
Microbiology
Answer: 2
The destruction of microorganisms on living tissues, as long as there is contact between the tissues and the antimicrobial agent, denotes antisepsis (option 2). Antisepsis refers to the application of antimicrobial agents to living tissues to reduce the possibility of infection, sepsis, or putrefaction.
Sterilization:
This is the process of completely eliminating all forms of microbial
life, including bacteria, viruses, fungi, and spores, from an object or
surface. Sterilization is typically achieved through methods such as
autoclaving (steam under pressure), dry heat, chemical sterilants, or
radiation. Sterilization is used for medical instruments, laboratory
equipment, and other items that must be free of all microorganisms.
Antisepsis:
Antisepsis refers to the application of antimicrobial agents to
living tissues to reduce the risk of infection, sepsis, or putrefaction.
Antiseptics are used on skin and mucous membranes to prevent infection
during surgical procedures, wound care, and other medical interventions.
Common antiseptics include alcohol, iodine solutions, and chlorhexidine.
Sanitization:
Sanitization is the process of reducing the number of microorganisms
on surfaces or objects to a level considered safe by public health
standards. This does not necessarily eliminate all microorganisms but
reduces them to a level that minimizes the risk of infection or disease.
Sanitization is commonly used in food service, public restrooms, and
other environments where hygiene is important.
A bacterial disease with oral manifestations is
1. Herpes Measles
2. Measles
3. Diphtheria
4. Leishmaniasis
Microbiology
Answer: 4
Diphtheria serious bacterial infection that usually affects the mucous
membranes of the nose and throat.
Diphtheria signs and symptoms usually begin 2 to 5 days after a person becomes
infected. Signs and symptoms may include:
A thick, gray membrane covering the throat and tonsils
A sore throat and hoarseness
Swollen glands (enlarged lymph nodes) in the neck
Difficulty breathing or rapid breathing
Nasal discharge
Fever and chills
Tiredness
Skin (cutaneous) diphtheria
A second type of diphtheria can affect the skin, causing pain, redness and
swelling similar to other bacterial skin infections. Ulcers covered by a gray
membrane also may be a sign of skin diphtheria.