Which of the following is a characteristic of larval echinoderms?
A) bilateral symmetry
B) spiral cleavage
C) gastrovascular cavity
D) exoskeleton
E) lophophore
Answer: A
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Photoreceptors are sensitive to what general type of sensory information?
A. tactile B. sound C. temperature D. chemicals in the animal's environment E. electromagnetic radiation
Both gram-positive and gram-negative cells have outer membranes.
Answer the following statement true (T) or false (F)
This polysaccharide is a chain of glucose units that are modified by having nitrogen-containing groups
It is the main structural fiber in the external skeletons of arthropods and is also a structural material in the cell walls of fungi.
a. chitin b. amylopectin c. cellulose d. glycogen e. amylose
Sea urchin populations are not affected by the decimation of kelp forests because these animals are generalists and can switch their diets
Indicate whether the statement is true or false