No one is certain what the function of the human appendix is. But, one thing we do know is that we can live without it, without noticeable consequences. Therefore, the human appendix is an example of a(n)
A) mutation.
B) vestigial structure.
C) analogous structure.
D) homologous structure.
E) adaptation.
B
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Oxidation and reduction reactions are chemical processes that result in a gain or loss of:
A. atoms. B. neutrons. C. electrons. D. molecules. E. protons.
The moraines left when glaciers retreat are characterized by
A. year-round ice. B. low nitrogen content and little organic matter. C. rich, fertile soil. D. high levels of nitrogen, phosphate and carbon.
Comparing cells synthesizing secretory proteins and cells secreting steroid hormones, the cells synthesizing the steroid hormones have
A) more rough ER. B) more smooth ER. C) equal amounts of smooth and rough ER. D) equal amounts of smooth and rough ER, but more lysosomes. E) equal amounts of smooth and rough ER, but fewer lysosomes.
Which of the following cannot be infected by viruses?
a. algae b. bacteria c. animals d. all of these can be infected by viruses