The center of a primary eudicot root is known as the:a
phloem.
b. symplast.
c. cortex.
d. pericycle.
e. stele.
E
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Which characteristic is NOT associated with Vibrio spp.?
A) aquatic B) gliding motility C) gram-negative D) pathogenic
Which of the following is TRUE of ligand-gated ion channels?
A. They bind ions with high affinity. B. They tend to allow any ion to pass through the channel. C. The intracellular domain of the channel contains the binding site for the ligand. D. They open upon binding the ligand to allow specific ions to pass through them. E. Ligand binding closes the channels preventing further ion passage through the channel.
The most common marine annelids are:
a. polychaetes. b. roundworms. c. earthworms. d. leeches. e. ribbon worms.
Amphioxus is an example of a
A. tunicate. B. reptile. C. hagfish. D. amphibian. E. lancelet.