Speciation, or the formation of new species, is
A) a form of microevolution.
B) responsible for the diversity of life.
C) necessary for natural selection and adaptation.
D) an event that has occurred only a few times in the history of the planet.
Answer: B
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Which of the following is NOT an example of a homeostatic mechanism?
a. sweating when you get hot b. the maintenance of blood glucose concentrations c. body water regulation d. heart rate increase during exercise e. childbirth
A codon is ________.
A. the section of RNA that codes for a protein B. the section of DNA that codes for a protein C. three nucleotides of DNA that code for an amino acid D. three nucleotides of RNA that code for an amino acid
Primary consumers are found at
a. the lowest trophic level. b. the highest trophic level. c. the second trophic level. d. all trophic levels. e. the third trophic level.
Potato spindle-tuber disease, which causes potatoes to become gnarled and cracked, is caused by an infectious agent consisting of a small circular RNA molecule that totally lacks a protein coat. These infectious agents are thought to exert their effects by interfering with the cell's normal path of gene expression. Such an infectious agent is known as a(n) __________.
A) eviscerion B) viroid C) provirous D) bacteriophage E) virunette