Answer the question using the accompanying figure. Water balance is maintained by the structures labeled ____
a. 1 and 3
b. 5 and 9
c. 7 and 8
d. 6 and 9
e. 1 and 6
ANSWER: d
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A water sample from a hot thermal vent contained a single-celled organism that had a cell wall but lacked a nucleus. What is its most likely classification?
A) Eukarya B) Archaea C) Animalia D) Protista E) Fungi
In septate fungi, what structures allow cytoplasmic streaming to distribute needed nutrients, synthesized compounds, and organelles throughout the hyphae?
A) multiple chitinous layers in cross-walls B) pores in septa C) complex microtubular cytoskeletons D) two nuclei E) tight junctions that form in cross-walls between cells
Which of the following hormones promotes seed dormancy?
A) cytokinin B) ethylene C) gibberellin D) abscisic acid
A membrane-bound sac used to transport substances into and out of cells is a
A.) pump B.) macrophage C.) lysosome D.) vesicle