Which antibodies in tears, saliva, and mucus help protect mucosal surfaces from many pathogens?
a) IgD
b) IgA
c) IgG
d) IgM
Ans: b) IgA
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Performing gene therapy on somatic cells removed from the body and then returning these cells to the body is called ________ gene therapy.
A) in vivo B) in situ C) in vitro D) ex vivo
Transcription starts at a region of DNA called a(n) _____
a. sequencer b. promoter c. activator d. terminator e. transcriber
Which of these eukaryotic molecules/structures can be responsible for the movement of bacteria within host cells?
A) invasins B) pseudopods C) cilia D) flagella E) actin molecules
Which characteristics best describe earthworms?
a. polychaete; fluid filled coelom b. oligochaete; open circulatory system c. moves by only longitudinal muscle contraction and hydrostatic skeleton d. oligochaete; scavengers; closed circulatory system e. hermaphrodites that fertilize themselves; closed circulatory system