Cheetahs are specialized hunters that stalk Thompson gazelles. This is an example of a ________ relationship.
A. commensalism
B. mutualistic
C. parasitic
D. predator-prey
Answer: D
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The host range of a virus depends on the presence of host receptor molecules
Indicate whether this statement is true or false.
Which of the following is NOT a way that bacteria benefit humans?
A. production of foodstuffs such as cheese B. production of antibiotics C. breaking down wastes, toxins, explosives, and petrochemicals D. killing harmful insects E. transferring nutrients across intestinal membranes
Mutations that inhibit Rb gene expression will have what effect on cell proliferation?
A) Cells will proliferate less, even if excess growth factors are present. B) Cells will proliferate less because growth factors are absent. C) Cells will proliferate more because growth factors are produced in excess. D) Cells will proliferate more, regardless of growth factor concentration. E) There will be no effect on cell proliferation; only apoptosis occurs.
In sea urchin development, the archenteron becomes the:
A) endoderm. B) lungs. C) ectoderm. D) digestive tube.