Chronic obstructive pulmonary disease (COPD) is characterized by ________.
A) asthma and atelectasis
B) chronic bronchitis and emphysema
C) cystic fibrosis and thick mucus
D) influenza and cough
Question 2
Which antibody is found on the surface of a B cell and activates it to become a plasma cell?
A) IgA
B) IgD
C) red blood cell antigen
D) IgG