5) A decrease in the production of C3 would result in
A) increased susceptibility to infection
B) increased numbers of white blood cells
C) increased phagocytosis
D) activation of C5 through C9
E) none of the above
6) Helicobacter pylori uses the enzyme urease to produce NH3 in order to counteract a chemical defense in the human organ in which it lives. This chemical defense is
A) lysozyme
B) hydrochloric acid
C) sebum
D) superoxide radicals
E) complement
7) Which of the following statements about IFN-a is not true?
A) It interferes with viral replication.
B) It activates adjacent cells to make AVPS.
C) It is released by fibroblasts.
D) It protects the cells that produce it.
E) It is released by infected cells.
8) Innate immunity can be defined as
A) Ability to ward off diseases
B) Defenses that are present at birth
C) Specific responses to a specific microbe
D) The lack of resistance
Answer (1)
A decrease in C3 leads to higher susceptibility to infections while H. pylori uses urease to counteract hydrochloric acid in the stomach. IFN-α is known for its role in viral defense but it is not released by fibroblasts, and innate immunity is innate from birth. Understanding these elements is crucial in immunology. ;
