The presence of which of the following antibodies usually indicates a recent or an active infection?
a. Immunoglobulin (Ig) G
b. IgA
c. IgM
d. IgE
C
Each of the five different classes of antibodies has its distinctive molecular configuration and is involved in the immune reaction in a different way. IgM is the first antibody produced when an invading microorganism is initially encountered and is the largest, with 10 antigen-binding sites. IgM is the first to arrive in the immune response.
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Eukaryotic cells are
A. less complex than prokaryotic cells. B. members of the Domains Bacteria and Archaea. C. defined by the presence of a membrane bound nucleus. D. able to reproduce more rapidly than prokaryotes. E. less complex than prokaryotic cells, members of the Domains Bacteria and Archaea AND able to reproduce more rapidly than prokaryotes.
A previously unknown animal is being studied so that it can be classified. It is an invertebrate, triploblastic, dorsoventrally flattened, acoelomate, and has flame cells. Which phylum would you place it in?
A. Platyhelminthes. B. Mollusca. C. Arthropoda. D. Cnidaria.
Members of the ____ flatworm lineage are vertebrate endoparasites;some, called blood flukes, cause an often deadly
disease in humans called schistosomiasis.
a. Trematoda b. Turbellaria c. Polychaeta d. Cestoda e. Hirudinea
The teeth designated by the letter "B" in the above figure are called ____
a. canines b. premolars c. incisors d. molars e. wisdom teeth