Melatonin regulates ____
a. heart rhythms in song birds
b. the stimulation of cancer cell growth in humans
c. the menstrual cycle in human females
d. sleep cycles in humans
e. milk production in mammals after giving birth
ANSWER: d
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The process of filtration in the glomerulus is driven
by a. active transport. b. hydrostatic pressure. c. osmosis. d. dialysis. e. sodium-potassium pumps.
Legumes secrete ____ to attract rhizobial bacteria in low nitrogen soils
a. cytokin b. flavonoids c. nod factors d. calcium e. water
The fossilized form of ____ is used in commercially important products, such as filters, polishes, and insect killer
a. dinoflagellates b. apicomplexans c. zooflagellates. d. euglenoids e. diatoms
Flukes are divided into the groups Monogenea and Digenea. Monogenea have a posterior holdfast with hooks, clamps, and suckers, while Digenea have suckers but never hooks and clamps. Monogenea have only one host in the life cycle and usually live on gills or skin of fish and amphibians. Digenea have at least two hosts, and are named for having two reproductive states in their life cycle (an adult and intramolluscan phase).Based on this information, the blood fluke Schistosoma would be classified as
A. an endoparasite and Monogenean. B. an ectoparasite and Monogenean. C. an endoparasite and Digenean. D. an ectoparasite and Digenean.