Which one of the following is a characteristic of complex multicellular organisms, but not simple multicellular organisms?
A. the functional specialization of subsets of
cells in the organism
B. the use of cell-adhesion molecules to allow
cells to adhere to one another
C. the presence of a single cell with multiple
nuclei
D. the presence of cells that are not in direct
contact with the external environment
A
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What is the key activity of panel II in the accompanying figure?
a. The enzyme is consumed as the products form. b. The substrate leaves the active site. c. The conversion of substrates to products occurs. d. The product leaves the enzyme. e. The product decomposes to the reactants.
A kidney machine removes solutes from the blood by means of
a. osmosis. b. diffusion. c. dialysis. d. active transport. e. bulk flow.
Decomposers perform their recycling efforts on organisms
a. at the end of a food chain. b. on the top of a pyramid. c. that are producers. d. that are consumers. e. all of these.
Plants can most readily utilize the ________ form of nitrogen
A) nitrous oxide B) N2 C) amino D) nitrate