All of the following is TRUE about IgM except
A) most efficient activator of complement via the classic pathway.
B) first antibody class to be secreted in a primary infection.
C) contains a secretory piece.
D) is a pentamer.
E) contains a J chain.
C
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As an adaptive immune response progresses, the production of variant antibodies that compete more effectively for antigen occurs, and B cells producing these antibodies are preferentially selected on the basis of their improved binding to antigen
This phenomenon is referred to as _______. a. isotype switching b. neutralization c. allelic exclusion d. affinity maturation e. somatic rearrangement.
Heart murmurs are extremely rapid, but regular, contractions of the heart
Indicate whether the statement is true or false
The use of inhalants over a long period of time may cause permanent damage to:
A) the brain. B) the heart. C) the kidneys. D) all of the above.
The term meaning the death of bone tissue is _______________.
osteitis deformans osteomyelitis osteonecrosis osteoporosis