MDS PREP
Which of the following is a characteristic microscopic feature of amoebic dysentery that distinguishes it from bacillary dysentery?
1) Presence of RBCs in the stool
2) Presence of pus cells in the stool
3) Presence of Charcot-Leyden crystals
4) Presence of ghost cells
The presence of Charcot-Leyden crystals is a characteristic microscopic feature of amoebic dysentery that distinguishes it from bacillary dysentery.
What type of genome do Hepatitis B viruses have?
1) ssRNA
2) dsDNA
3) ssDNA
4) dsRNA
General Microbiology Answer: 2Hepatitis B viruses possess a double-stranded DNA (dsDNA) genome, which is unique among the hepatitis viruses. This dsDNA is partially double-stranded and circular, playing a crucial role in the virus life cycle and replication.
The minimum and maximum temperature for normal metabolic
activity microorganisms that live on or within the human body is
1 50 C
to 300 C
2 200 C to 450
C
3. 300 C to 400
C
4. 15 C to 600
C
Microbiology Answer: 2
The minimum and maximum temperature for normal metabolic activity microorganisms that live on or within the human body is 20° C to 45°C
What is the primary mode of action of exotoxins?
1) Enzymatic
2) Non-enzymatic
3) Structural disruption
4) Inhibition of protein synthesis
General Microbiology Answer: 1
The primary mode of action of exotoxins is enzymatic, as they often act as enzymes that modify or damage host cell functions.
What is the primary target of antibodies in neutralizing the action of exotoxins?
1) Cell wall components
2) Lipopolysaccharides
3) Protein components of the toxin
4) Enzymes involved in toxin production
General Microbiology Answer: 3
Antibodies neutralize exotoxins by binding to their protein components, preventing them from interacting with host cells and causing damage. This immune response is critical for protecting the host from the harmful effects of these toxins.
Which medium is suitable for the transport of Salmonella and Shigella?
1) Cary-Blair medium
2) Thiosulfate-citrate-bile salts-sucrose (TCBS) agar
3) Hektoen enteric (HE) agar
4) Blood agar
General Microbiology Answer: 1the medium suitable for the transport of Salmonella and Shigella is Cary-Blair mediumx. This medium is designed to maintain the viability of these organisms during transport and is selective for enteric pathogens by inhibiting the growth of other non-target bacteria. TCBS agar and HE agar are used for the selective isolation and growth of these organisms, while blood agar is a general purpose medium used for various bacteria.
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
Which of the following hepatitis viruses has a single-stranded RNA genome?
1) Hepatitis A
2) Hepatitis B
3) Hepatitis C
4) Hepatitis D
General Microbiology Answer: 1Hepatitis C virus (HCV) is known for its single-stranded RNA genome. This characteristic is crucial for its classification and understanding its replication cycle, which involves RNA-dependent RNA polymerase.