Which one of the following is an example of osmosis?
A. Glucose is transported from our blood stream across cell membranes and into the cytoplasm.
B. Sodium is pumped across a cell to increase its concentration on one side of the cell membrane.
C. A broken bottle of perfume is able to be smelled throughout the department store.
D. Cells of our kidneys reabsorb water to prevent it from all leaving through our urine.
E. A bacterium in the blood stream is engulfed by a white blood cell.
Ans: D. Cells of our kidneys reabsorb water to prevent it from all leaving through our urine.
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Blood glucose levels are regulated by
a. insulin. b. glucagon. c. cortisol. d. insulin and glucagon only. e. insulin, glucagon, and cortisol.
An example of evolutionary divergence is best characterized by Darwin's observation of ____
a. fossils along the coast of Argentina b. body armor similarities between armadillos and fossilized glyptodonts c. differences in appearance between nutria and beaver d. differences in bill shape and food habits of finches e. genotypic and phenotypic variability of species
Sexual selection affects male characteristics more than female characteristics. Sexual selection operates by which of the following methods?
A. Intrasexual selection, where one sex directly competes with each other for the opportunity to mate with the opposite sex. B. Intersexual selection, where females select mate on the bases of their physical attributes. C. intersexual selection, cryptic female choice. D. Intrasexual selection where one sex directly competes with each other for mates and intersexual selection where females select their mate because of physical attributes and through cryptic female choice. E. Predatory sexual selection, where females only choose mates that can avoid predators.
The major difference between the human male and
female reproductive systems is the a. provision of a site for fertilization and embryo development in the female. b. production of haploid gametes only by the male. c. diploid polar bodies of the female. d. generation of millions of eggs but only thousands of sperm each month. e. presence of a duct system opening to the body’s exterior only in females.