It is generally accepted that the vertebrates that evolved during the early Devonian period are the
A. sharks and bony fish.
B. mammals.
C. dinosaurs.
D. birds.
E. hominoids.
Answer: A
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A phospholipid molecule has a polar and a nonpolar end. Because of this, water molecules form
A. polar bonds with the nonpolar end of the phospholipid molecule. B. polar bonds with the polar end of the phospholipid molecule. C. hydrogen bonds with the nonpolar end of the phospholipid molecule. D. hydrogen bonds with the polar end of the phospholipid molecule. E. covalent bonds with the nonpolar end of the phospholipid molecule.
A transverse plane is indicated by
a. A. b. B. c. C. d. D. e. E.
Modern biologists still might consult the results of the Challenger expedition in order to:
A) Look at their charts of the South Pole. B) See the results of experiments in their on-board scientific laboratory. C) Consult Edward Forbes' reports on the fauna. D) Compare their deep-sea specimens with those taken by this expedition.
Why is prokaryotic cell division fundamentally different from eukaryotic cell division?
A) Prokaryotic cells have a single chromosome and no nuclear membrane. B) Prokaryotic cells do not have a plasma membrane. C) Prokaryotes have many more chromosomes to divide. D) Prokaryotic cells divide for several months and then live for decades without dividing.