MDS PREP
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
The term cold sterilization has been employed to refer to
1. physical methods of sterilization
2. prolonged exposure to 20° C
3. exposure to low temperature steam
4. chemical disinfection
Microbiology
Answer: 4
chemical disinfection is cold strelization
What is the typical finding of eosinophils in amoebic dysentery?
1) Abundant
2) Few
3) Absent
4) Numerous
General Microbiology Answer: 3Amoebic dysentery is not typically associated with a significant eosinophilic response. Eosinophils are a type of white blood cell that is often involved in allergic reactions and parasitic infections, but their presence is usually minimal in the context of amoebic infections. The inflammatory response in amoebic dysentery is mainly composed of neutrophils and macrophages.
Which of the following is an acidogenic genus found in deep dental caries, that often increases significantly in
the saliva during periods of caries activity?
1.Lactobacillus
2.Candida
3. Actinomyces
4. Rothia
Microbiology
Answer: 1
Lactobacillus is an acidogenic genus found in deep dental caries, that often increases significantly in
the saliva during periods of caries activity
Which of the following is NOT a characteristic of anthracoid bacilli?
1) Generally motile
2) Non-capsulated
3) Grow in long chains
4) Pathogenic to laboratory animals
Anthracoid bacilli are generally non-motile and non-capsulated, and they do not grow in long chains.
What is the typical macroscopic appearance of the stool in cases of amoebic dysentery compared to bacillary dysentery?
1) Amoebic dysentery stool is small and odorless, while bacillary dysentery stool is copious and offensive.
2) Both amoebic and bacillary dysentery stools are copious and offensive.
3) Amoebic dysentery stool is dark red and acidic, while bacillary dysentery stool is bright red and alkaline.
4) Amoebic dysentery stool is bright red and alkaline, while bacillary dysentery stool is dark red and acidic.
General Microbiology Answer: 3
Amoebic dysentery stool is typically dark red and acidic, while bacillary dysentery stool is bright red and alkaline.
What is the primary characteristic of prions?
1) They contain nucleic acid.
2) They are sensitive to heat.
3) They are resistant to proteases.
4) They are proteinaceous infectious particles.
General Microbiology Answer: 4Prions are infectious proteins that are highly resistant to destruction by proteases and other methods that typically degrade proteins. This resistance is what allows them to persist in the host and cause disease. They do not contain nucleic acid, which is a hallmark of other types of infectious agents such as bacteria, viruses, and fungi.
The main tool for detection of "cases" of tuberculosis is -
1. Sputum examination
2. Mantoux test
3. Chest X-ray
4. All of the above
Microbiology
Answer: 1
The main tool for the detection of "cases" of tuberculosis is 1.
Sputum examination.
Explanation of Each Option:
Sputum examination: This is the primary method for
diagnosing active pulmonary tuberculosis. Sputum samples are collected and
examined for the presence of Mycobacterium tuberculosis through
microscopy (e.g., acid-fast bacilli staining) and culture methods. It is
considered the gold standard for confirming active TB cases.
Mantoux test: Also known as the tuberculin skin test,
this test is used to determine if a person has been exposed to the
tuberculosis bacteria. However, it does not diagnose active TB; rather, it
indicates whether a person has been infected with the bacteria at some
point.
Chest X-ray: While chest X-rays are important for
identifying lung abnormalities associated with tuberculosis and can support
the diagnosis, they are not definitive for detecting the bacteria itself.
They are often used in conjunction with sputum examination.