Which antibodies form dimers that protect mucosal surfaces from invasion by pathogens?
A. IgM
B. IgE
C. IgA
D. IgD
Answer: C. IgA
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. In Mendel's crosses, pure-breeding individuals were always in the ____________________
generation. Fill in the blank(s) with the appropriate word(s).
Huntington disease is _____
a. a model of a multifactorial trait, controlled by several genes b. inherited as an X-linked dominant trait c. a disease with onset in early childhood d. one that produces no significant changes in brain cells e. a model of a single gene defect affecting behavior
Scramble competition results when all individuals in a population share the limited resources. Indicate whether the statement is true or false
What is the function of macrophages during infection by a pathogen?
A. to kill the pathogen by directly damaging its cell membrane B. to phagocytize the pathogen C. to produce antibodies D. all of the above