Which of the following can waterproof cell walls, allowing for structures such as watertight conduction channels?
a. lignin
b. hemicelluloses
c. pectin
d. cellulose
e. chitin
A
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Compared with sponges, cnidarians have a wider array of cell types permitting more sophisticated tissue functions. These functions include (select all that apply):
A. secretion of digestive enzymes. B. muscle contraction/movement. C. the ability to sense the environment via a network of nerve cells. D. the ability to communicate within the organism using hormones. E. none of these
An automated system uses bead-capture technology in the detection of which of the following spirochetes?
a. Treponema b. Borrelia c. Leptospira d. Brachyspira
The outermost whorl of a flower typically consists of one or more
a. petals. b. carpels. c. stamens. d. receptacles. e. sepals.
All organisms that are photosynthetic are oxygenic.
Answer the following statement true (T) or false (F)