At what point in the figure above is the urine most
concentrated?
a. A
b. B
c. C
d. D
e. none of these
Answer: d
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Echinoderms are classified as Bilateria and they start out as bilateral larvae, yet as they develop they change into radially symmetrical adults. Would you expect their genes controlling the development of radial symmetry to be:
A. different from those controlling development of symmetry in all other radially symmetrical animals B. similar to genes controlling body form in Porifera C. similar to genes controlling body form in Ctenophora D. similar to genes controlling body form in the lophophorates E. similar to a common set of genes controlling body form in Ctenohora, and lophophorates
A plant wilts when ____
a. the soil water becomes hypotonic with respect to the cytoplasm b. the soil water becomes hypertonic with respect to the cytoplasm c. the turgor inside the cell increases d. the turgor in the soil disappears e. osmotic pressure is equal to the turgor pressure
Chylomicrons are formed in the epithelial cell layer of the GI tract.
a. true b. false
This class of antibodies is responsible for many allergies and may help protect against parasitic worm infections.
A. IgG B. IgC C. IgE D. IgD