The most significant difference between the Archaea and the Bacteria is:
a. lack of a nuclear envelope in the Archaea.
b. the absence of the 70S ribosomes in the Bacteria.
c. the presence of a single filament flagellum in the Bacteria.
d. the absence of peptidoglycans in the cell walls of the Archaea.
e. the presence of fatty acids in the plasma membranes of the Archaea.
D
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Restriction endonucleases in bacteria may have evolved in order to
A. protect the bacteria from infection by viruses. B. carry out natural genetic engineering. C. use nucleic acids as a food (energy) source. D. All of the choices are correct.
Of the following, which cell structure would most likely be visible with a light microscope that has been manufactured to the maximum resolving power possible?
a. mitochondrion b. microtubule c. ribosome d. largest microfilament e. nuclear pore
Which of the following is NOT true about the peacock butterfly?
A. The dark underside of their wings provides camouflage. B. The spots on the wings may resemble owl eyes, which help deter predation. C. The butterflies remain still when a predator is near so as not to draw attention. D. The rapid movement of their wings produces a hissing sound. E. A resting butterfly’s closed wing resembles a dead leaf.
The ________ and ________ give rise to all of the other cells of the adult plant.
A. bud primordia; leaf primordia B. vascular cambium; cork cambium C. phloem; xylem D. pericycle; bud primordia E. shoot apical meristem; root apical meristem