19. What is the effect of malnutrition on the synthesis of IgG?
A) Altered T-cell function
B) Defective T cell signaling
C) Failure to produce C1 inhibitor
D) Reduced synthesis of IgG due to low supply of amino acids

20. What is the typical age group affected by common variablehypogammaglobulinemia?
A) Between 13 and 35 years
B) In childhood
C) Before the end of the 2nd year of life
D) In patients with liver failure

21. What is the likely cause of death in individuals with Chediak-Higashisyndrome?
A) Poor adhesion of neutrophils to endothelial surfaces
B) Defective neutrophil chemotaxis
C) Infections
D) Failure of helper T cells to produce gamma interferon

22. What is the mode of inheritance for chronic granulomatous disease?
A) X-linked trait in two-thirds of the cases and autosomal recessive traitin one-third
B) Autosomal dominant
C) X-linked dominant
D) Autosomal recessive