Which is a characteristic of tapeworms?
a. Tapeworms have a simple life cycle.
b. Tapeworms have a complete digestive system.
c. Tapeworms have a closed circulatory system.
d. Tapeworms have a well developed sensory system.
e. Tapeworms have bodies that consist of hundreds of reproductive segments.
e
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As the action potential peaks, ____
a. the activation gates of Na+ channels close b. the inactivation gates of Na+ channels close
c. the activation gates of K+ channels close d. the inactivation gates of Na+ channels close e. Na+/K+ active transport pumps are activated
The letter “A” in the above figure represents
a. the root nodules. b. the primary root. c. the primary leaf. d. the cotyledons. e. none of these.
How can Cytophaga and Flexibacter be distinguished in the laboratory?
a. by observing for gliding motility b. by comparing growth rate in acetate c. by scoring for growth on cellulose d. all of the above
Retinoic acid ____
a. causes germ cells in male embryos to enter meiosis b. causes germ cells in female embryos to enter meiosis c. prevents germ cells in male embryos from entering meiosis d. prevents germ cells in female embryos from entering meiosis e. affects entry into mitosis but not meiosis