Sponges belong to the phylum:
a. Porifera.
b. Cnidaria.
c. Platyhelminthes.
d. Nematoda.
e. Tubularia.
A
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Which of the following best describes the development of sexual structures in mammals?
A. Embryos develop male structures only once the SRY gene on the Y chromosome. becomes active; if SRY is not present, they develop female structures. B. Embryos initially develop female structures, but these degenerate and male structures develop once SRY becomes active. C. Embryos initially develop both male and female structures; once SRY becomes active, female structures degenerate and male structures continue to develop. D. Embryos initially develop male structures; if SRY is not present, these degenerate and female structures develop. If SRY is present, they continue to develop. E. None of these accurately describes the development of sexual structures in mammals.
Changes in ________ represent the predominant cause for biological evolution.
A. homeostasis B. growth and development C. reproduction D. genetic makeup E. energy
Found mostly in marine environments, members of the ____ flatworm lineage are free-living,and acquire food with a
muscular pharynx; most are hermaphroditic.
a. Trematoda b. Turbellaria c. Polychaeta d. Cestoda e. Hirudinea
The Most Probable Number (MPN) method is used
A) to estimate numbers of cells in samples with a high density of bacterial cells. B) when samples contain obligate anaerobes. C) to estimate numbers of cells in samples with a low density of bacterial cells. D) to isolate autotrophic bacteria. E) to determine the generation time of bacterial isolates.