The average number of children born to a woman during her lifetime is known as:
a. age structure.
b. replacement-level fertility.
c. natality.
d. total fertility rate.
e. infant mortality rate.
D
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Which of the following genera of the Archaea do not have cell walls?
A. Thermoplasma B. Thermococcus C. Halobacterium D. None of the choices are correct.
Which statement is false regarding schizophrenia?
a. The genes responsible along with the environmental conditions have now been identified. b. The disorder is characterized by delusion, hallucinations, and abnormal social behavior. c. Exceptional creativity is often associated with it. d. Affected individuals show altered gene expression in certain brain regions. e. Family trees point to a genetic basis.
Members of the genus Rhizobium ________.
A. grow symbiotically in root nodules of legumes where they fix nitrogen B. are important nitrifying bacteria that convert nitrite to nitrate C. infect broad-leaved plants and cause crown gall disease D. are free living soil bacteria that fix nitrogen
Which of the following statements concerning the characteristics of life is FALSE?
A) reproduction is defined as an increase in the size of an organism. B) viruses have some, but not all, of the characteristics of living things. C) organisms may not exhibit all of the characteristics of life at all times. D) reproduction can occur asexually or sexually in living things. E) living things store metabolic energy in the form of chemicals such as ATP.