The water vascular system in echinoderms is used for locomotion, water enters the water vascular
system of a sea star through a structure called the
a. ampulla.
b. ossicle.
c. radial canal.
d. ring canal.
e. madreporite.
E
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Loading of most carbohydrates produced by photosynthesis into companion cells at a source occurs by
a. osmosis. b. proton pumping. c. suction from unloading at a sink. d. active transport. e. diffusion of water from the xylem.
Serum is plasma without the proteins involved in clotting
____________________ Indicate whether the statement is true or false.
What is the cellular structure of most rhizarians?
A. Single celled, shelled B. Multicellular, shelled C. Unicellular, naked D. Colonial, naked E. Colonial, shelled
All of the following are benefits of food irradiation, except
A) It can kill insects on the food. B) It makes the food less nutritious. C) It can kill bacterial pathogens on the food. D) It can inhibit the sprouting of white potatoes. E) It can reduce the number of food-borne deaths each year.