EXAM BY MR. LOPEZ

Question 1

1. Which Immunoglobulin helps initiate the classic complement pathway?

A. IgA
B. IgE
C. IgD
D. IgG

Answer 1

IgG

NOTE:
Both IgG and IgM are the immunoglobulins that help initate the activation of classic complement pathway. IgM is more potent complement activator.

Question 2

Which of the following choices describes Class I
MHC molecules?*

A. presents antigens to CD4 T cells
B. 8 to 11 amino acids
C. has classes DP, DQ, DR
D. 13 to 18 amino acids

Answer 2

8 to 11 amino acids

Question 3

the presence of human microbiota acts as defense
mechanism by:

A. Maintaining an acidic environment
B. Competing with potential pathogens
C. Keeping phagocytes in the area
D. Coating of mucosal surfaces

Answer 3

Competing with potential pathogens

NOTE:
*In many locations of the human body, teh presence of
normal flora (also called microbiota) helps to keep
pathoegns from establishing themselves. Normal flora is the mix of bacteria that are normally found at specific
body sites and do not typically cause disease