Nokea
The optimal PH for most pathogenic bacteria and viruses is:
- A. 5.0-5.5
- B. 8.0-9.6
- C. 7.2-7.4
- D. 4.2-4.4
Correct Answer: C
Rationale: The correct answer is C (7.2-7.4) because most pathogenic bacteria and viruses thrive in a neutral pH environment close to 7.0. This pH range is optimal for their growth and survival. Choice A (5.0-5.5) is too acidic for most pathogens. Choice B (8.0-9.6) is too alkaline, which is not conducive for their survival. Choice D (4.2-4.4) is also too acidic and would likely inhibit the growth of pathogenic bacteria and viruses. Thus, a pH range of 7.2-7.4 provides the most suitable conditions for their proliferation.
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Anti-influenza drugs that target the neuraminidase are;
- A. Maxi Grip and Tamiflu
- B. Theraflu and Relenza
- C. Amantadine and Rimantadine
- D. Relenza and Tamiflu
Correct Answer: D
Rationale: The correct answer is D: Relenza and Tamiflu. Both Relenza and Tamiflu are anti-influenza drugs that target the neuraminidase enzyme of the influenza virus, thereby inhibiting its replication and spread. Maxi Grip (A) is not an anti-influenza drug, Theraflu (B) contains different active ingredients, and Amantadine and Rimantadine (C) target a different viral protein, M2 ion channel. Therefore, choices A, B, and C are incorrect as they do not specifically target neuraminidase for influenza treatment.
Saprophytes are microorganisms which:
- A. Can induce typical infection
- B. Cannot induce infectious disease
- C. Can induce chronic infection
- D. Can induce mixed infection
Correct Answer: B
Rationale: The correct answer is B: Cannot induce infectious disease. Saprophytes are microorganisms that obtain nutrients from decaying organic matter and do not cause infectious diseases in humans. They play a vital role in the ecosystem by decomposing dead organisms. Choice A is incorrect because saprophytes do not cause typical infections. Choice C is incorrect because saprophytes do not cause chronic infections. Choice D is incorrect because saprophytes do not cause mixed infections involving multiple pathogens. Therefore, the correct answer is B as saprophytes do not induce infectious diseases.
Chitin is a component of the cell wall of:
- A. fungi
- B. bacteria
- C. viruses
- D. viruses
Correct Answer: C
Rationale: Chitin is a polysaccharide found in the cell walls of fungi. Bacteria have cell walls made of peptidoglycan, not chitin. Viruses do not have cell walls as they are acellular entities. Therefore, the correct answer is A: fungi.
What type of immunity is responsible for the agglutination of viruses:
- A. Passive immunity
- B. Humoral immunity
- C. Cell mediated immunity
- D. Non specific immunity
Correct Answer: B
Rationale: The correct answer is B: Humoral immunity. Humoral immunity involves the production of antibodies by B cells that can bind to antigens on viruses, leading to their agglutination. This process prevents the spread of the virus in the body. Passive immunity (A) involves receiving pre-formed antibodies, not the production of antibodies. Cell-mediated immunity (C) involves the activation of T cells, not the direct agglutination of viruses. Non-specific immunity (D) refers to general defense mechanisms like inflammation and fever, not targeted agglutination of viruses.
Agglutination reaction is one of the following:
- A. Western blot
- B. ELISA
- C. Reaction type GRUBER
- D. Ascoli ring test
Correct Answer: C
Rationale: The correct answer is C: Reaction type GRUBER. Agglutination reaction in GRUBER involves the clumping of particles due to specific antibodies binding to antigens on the surface. This reaction is commonly used in blood typing and serology tests.
A: Western blot is a technique used to detect specific proteins in a sample, not related to agglutination.
B: ELISA is an enzyme-linked immunosorbent assay used to detect antibodies or antigens, not based on agglutination.
D: Ascoli ring test is a method to detect the presence of DNA in a sample, not related to agglutination.