The use of the suffix "ase" on a word denotes a(n)
A. substrate.
B. product.
C. enzyme.
D. electron acceptor.
E. substrate AND electron acceptor.
C
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Which of the following steps in prokaryotic binary fission is INCORRECT?
A. DNA is replicated bidirectionally from a single point on the circular chromosome. B. The two replicated chromosomes remain attached to the plasma membrane. C. The cell continues to grow outward symmetrically, separating the two chromosomes. D. Cell wall material is laid down at the midpoint to separate the two daughter cells. E. Construction of the plasma membrane and cell wall separates the two daughter cells.
Andrew P. Hendry and colleagues discovered that Galápagos ground-finches with small bills and ground-finches with
large bills were more common and had higher fitness than birds with bills of intermediate size, a demonstration of ____ selection
a. disruptive b. directional c. stabilizing d. sexual e. artificial
In the stationary phase,
A. the number of microbial deaths exceeds the number of new cells formed. B. the number of microbial deaths is equal to the number of new cells formed. C. new cells are no longer formed because of adverse environmental conditions. D. cellular reproduction is most active.
A population of mountain goats are split because of the formation of a glacier. After 500 years the glacier melts and the two goat populations are free to move between the two areas. Under what conditions might a hybrid zone occur?
A. Post-zygotic isolating mechanisms have arisen. B. Pre-zygotic isolating mechanisms have arisen. C. Gene flow between the two populations does not occur. D. Both pre- and post-zygotic isolating mechanisms have arisen. E. Reproductive isolation is incomplete.