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
Answer: D
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What is a product of the electron transport chain started by photosystem II?
A. NADPH B. oxygen C. glucose D. water E. ADP
Peptide hormones require ____
a. receptors in the nucleus b. cholesterol for synthesis c. synapses for target tissue interaction d. second messenger systems e. DNA receptors
Refer to Figure 52-2. In this sequence of events the bell is serving as:
a. a motor stimulus. b. the conditioned stimulus. c. a cognition stimulus. d. a sign stimulus. e. the unconditioned stimulus.
The high osmolarity of the renal medulla is maintained by all of the following EXCEPT _____
A) active transport of salt from the upper region of the ascending limb B) the spatial arrangement of juxtamedullary nephrons C) diffusion of urea from the collecting duct D) diffusion of salt from the descending limb of the loop of Henle