Trichoplax adhaerens has no nerve cells, but
scientists have discovered
a. genes that encode signaling molecules.
b. a response to harsh chemicals.
c. movement toward a food source.
d. adherence genes.
e. none of these.
Answer: a
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Which protozoan parasite can invade the intestinal wall using a protease enzyme that not only breaks down the wall tissue but also cleave IgA, IgG, and complement components?
A. Cryptosporidium parvum B. Giardia intestinalis C. Cyclospora cayetanensis D. Entamoeba histolytica
Reproductive isolating mechanisms
a. occur within a species. b. can prevent members of the same species from reproducing. c. only act after fertilization. d. can prevent members of different species from interbreeding. e. only act before fertilization.
Contractions of the dome-shaped __________ and the intercostal muscles between the ribs alter the volume of the
thoracic cavity during breathing. Fill in the blank(s) with the appropriate word(s).
A grouping of three nucleotides code for one amino acid
__________________ Indicate whether the statement is true or false.