When Ellison and Gotelli manipulated concentrations of nutrients available to pitcher plants, what was the independent variable?
A. number of insects fed to each plant
B. ratio of the pitcher opening to pitcher length
C. ratio of the keel width to total width
D. amount of nitrogen or phosphorus added to the pitcher of each plant
E. amount of nitrogen or phosphorus added to the roots of each plant
C. ratio of the keel width to total width
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In a human cell, there are _____after DNA replicates during S phase
a. 92 chromosomes and 46 pairs of sister chromatids b. 46 chromosomes and 23 pairs of sister chromatids c. 23 chromosomes and 23 pairs of sister chromatids d. 92 chromosomes and 23 pairs of sister chromatids e. 40 chromosomes and 20 pairs of sister chromatids
Entamoeba histolytica can cause amoebic dysentery. It moves using pseudopodia, feeds heterotrophically, and is unicellular. Entamoeba histolytica is which of the following?
A. a protozoan B. an alga C. a slime mold D. a diatom E. a dinoflagellate
Phytoestrogens are steroid-like chemicals that are derived from soy. One of their characteristics is that they are able to
A. paralyze nerve endings. B. increase the rate of prostate cancer in men. C. cause estrogen breakdown within human cells. D. cure malaria. E. bind to the human estrogen receptor.
A person is brought to the emergency room with constant high fever, extensive edema, low blood pressure, and petechiae. From which of the following may the person be suffering?
A) septicemia B) plague C) Lyme disease D) brucellosis E) infectious mononucleosis