44. The CSa peptidase enzyme of Streptococcus pyogenes breaks down C5a, resultin

Question

44. The CSa peptidase enzyme of Streptococcus pyogenes breaks down C5a, resulting in a. Lysis of phagocytes b. Lack of opsonization of streptococcus cells Decreased accumulation of phagocytes Lysis of streptococcus cells 45. All the following are true of A-B toxins, except a. The portion A is an enzyme b. The B portion is responsible for the toxic properties e. They are exotoxins d. The B portion binds to host cells and allows the toxin to enter the cell Endotoxins that link MHC class II protein to the plesma membrane Endotoxins that attach to the outside of MHC class 1 proteins Exotoxins that attach to the outside of MHC class II proteins NONE of the above a. b. c. d. 47, Successful pathogens have the ability to carry out a number of stepa essential for their a. Transmission of the causative agent to a suseeptible host and adherence of the agent to b. Damage to the host by the activities of toxins or other mechanisms virulence and their survival, these inclade: target tissue c. Exit from the host and survived long enough for steps to occur

Explanation / Answer

Q44:- Option C

Explanation:- It would result in decreased production of phagocytes.

Q45:- Option B

Explanation:- The Ab toxins are exotoxins consists of two components A (enzyme) B ( binding subunit).B subunit is not responsible for binding properties.

Q46:- Option D

Explanation:- Superantigens are class of antigens that activate non specifically T-lymphocytes and are released by bacteria and viruses yo overcome immune system of host.

Q47:- Option A

Explanation:- Transmission of causative agent to sucesptible host adherence of the agent to the target tissues.

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