Early symptoms of which STD include flattened, painless chancres at the initial infection site; if left untreated in the
long term, this STD can cause mental illness, blindness, and death?
a. gonorrhea
b. syphilis
c. chlamydia
d. trichomoniasis
e. genital herpes
ANSWER: b
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Which of the following fluids within the gastrointestinal tract is correctly paired with its antimicrobial effect?
A. Pancreatic fluid; IgE B. Bile; lactoferrin C. Stomach fluid; high pH D. Saliva; lysozyme
Characteristics of freshwater runoff include: a. high salinity compared to sea water
b. high nitrogen compared to sea water. c. high detritus compared to sea water. d. high phosphorus compared to sea water.
What are amino acids?
a. subunits of lipids b. subunits of carbohydrates c. subunits of proteins d. subunits of nucleic acids
Which of the following secrete spicules?
a. sperm b. porocytes c. choanocytes d. amoeboid cells