Calcium is required for bacteria because it
A. stabilizes the cell wall.
B. maintains cellular pH.
C. stabilizes the nucleoid.
D. stabilizes the ribosomes.
E. makes strong cell walls.
Answer: A
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The wood of gymnosperms is composed of ______________, and the wood of angiosperms (e.g., a cherry blossom) can consist of ______________________
A. tracheids; fibers and vessel elements B. fibers and tracheids; vessel elements C. vessel elements and fibers; tracheids D. tracheids and vessel elements; fibers
The outer bark of a woody stem is produced by
a. cork cambium. b. inner bark. c. parenchyma. d. vascular cambium.
How is Puccinia graminis primarily transported to new regions of the world?
a. infected livestock b. humanitarian aid distribution c. wind d. flooding e. infected seed stock
The movement of substances from regions where their concentration is higher to regions where their concentration is lower is called
A. diffusion. B. exocytosis. C. active transport. D. pinocytosis. E. pumping.