Question

Please answer the following questions (33-39)

33. Which of the following compounds is released by a virally infected cells to warn neighboring cells?

A. Interferon

B. Gammaglobulin

C. C9

D. Endotoxin

E. None of the above

34. The epitope binding region of an IgG antibody is…

A. Located in the constant region between the two heavy chains

B. Located in the variable region between the two ends of the short chains

C. Formed between the ends of the heavy and light chain in the distal arm of the variable

D. Formed formed where the two heavy chains meet at the branch in the “Y”

E. None of the above

35. Which of the following Is essential viral encoded enzyme used by HIV during infection of human cells?

A. DNA ligase

B. Lac permease

C. Telomerase

D.Reverse transcriptase

E. None of the above

36. Which of the following is a toll-like receptor most likely to bind?

A. C3b

B. Defensins

C. Pencillinase

D. Lipopolysaccharide

E. None of the above

37. Which class of antibody can be delivered to the fetus by crossing the placenta?

A. IgA

B. IgD

C. IgE

D. IgG

E. IgM

38. What is the appropriate response when a foreign antigen is presented by an MHC class II molecule?

A. An effector CD8+ should kill the presenting cell

B. An effector CD4+ should kill the presenting cell

C. An effector CD8+ should activate the presenting cell

D. An effector CD4+ should activate the presenting cell

E. None of the above

39. The gastrointestinal infection antibiotic associated colitis which can be successfully treated by the fecal transplant method is caused by what pathogen?

A. E.coli

B. Bordetella pertussis

C. Vibrio cholerae

D. Clostridium difficile

E. None of the above

Answer 1

Upon infection by a virus, cells release interferon. Interferon acts as a signal to surrounding cells against the virus. This allows other non infected cells to get prepared and attack viral growth.

Correct choice should be:

Interferon