Which antibodies form dimers that protect mucosal surfaces from invasion by pathogens?

A. IgM
B. IgE
C. IgA
D. IgD


Answer: C. IgA

Biology & Microbiology

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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).

Biology & Microbiology

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

Biology & Microbiology

Scramble competition results when all individuals in a population share the limited resources. Indicate whether the statement is true or false

Biology & Microbiology

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

Biology & Microbiology