Fleas, lice, and tapeworms are parasites. Parasites are organisms that live on or inside a host organism and
a) harm the host
b) genetically mutate the host
c) help the host
d) have no effect on the host
Ans: a) harm the host
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Which of the following is most likely to lead to resource partitioning?
A. mutualism B. predation C. parasitism D. niche overlap E. commensalism
A researcher is interested in comparing the DNA sequence for the gene encoding myosin between a cheetah (mammal) and a red snapper (fish). Which database would be most helpful to her?
A. GenBank B. Swiss protein database C. Protein Information Resource D. Protein Data Bank E. Swiss protein and Protein Information Resource databases
In sponges, the choanocytes or collar cells
a. are found scattered throughout the sponge body. b. act in obtaining food for the sponge. c. allow exit of water from the sponge. d. produce spicules made of silica or calcium carbonate. e. give rise to gametes.
How does a cell typically know when to divide?
A. Proto-oncogenes code for growth factor proteins that initiate cell division. B. Cells have an internal clock and divide only when they reach a certain age. C. Tumor suppressor genes code for growth factor proteins that initiate cell division. D. Oncogenes code for growth factor proteins that initiate cell division.