Years before Schwann’s pronouncement that a cell
has a life of its own even as a component of a
multicellular organism, the cell nucleus had been
discovered by
a. Robert Hooke.
b. Robert Brown.
c. Theodor Schwann.
d. Rudolf Virchow.
e. Anton van Leeuwenhoek.
Answer: b
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Which one of the following can contribute to a protein's tertiary structure?
A. ionic bonding B. van der Waal's forces C. covalent bonding D. hydrogen bonding E. All of these choices are correct.
The substance H2O is considered to be
a. both a molecule and a compound. b. a compound but not a molecule. c. neither a molecule nor a compound. d. a molecule but not a compound. e. a chemical but not biological molecule.
Which of the following is not a helminth that causes primarily intestinal symptoms?
A. Diphyllobothrium latum B. Taenia solium C. Trichuris trichiura D. Enterobius vermicularis
Deep-sea vent or rift communities would be associated with which bathygraphic feature?
a. Escarpment b. Rises and ridges c. Trenches d. Submarine canyons