What is the current world's population?
A. over 10 billion
B. over 7 billion people
C. almost 3 billion people
D. almost 5 billion people
E. almost 1 billion people
Answer: B
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Most of Europe is in the ______ biome.
A. high mountain B. taiga C. temperate deciduous forest D. tundra E. None of the choices are correct.
Answer the following statements true (T) or false (F)
1. Streptomyces are aerobic soil bacteria that produce over two-thirds of our antibiotics of natural origin. These antibiotics should also be effective in killing Streptomyces. 2. Streptomyces are obligate aerobic soil bacteria that infect many plant roots, causing scabs on their leaves. You would expect to find more Streptomyces near the surface of the soil. 3. Antibiotics usually are not dangerous to use in treating bacterial infections because most antibiotics exploit structures and functions in bacteria that are not present in host cells. 4. Pili are bacterial structures used primarily for motility. 5. Autotrophs must acquire carbon from organic molecules produced from other organisms.
Which hormone is responsible for the development of female secondary sex characteristics?
a. testosterone b. estrogen only c. progesterone only d. estrogen and progesterone e. human chorionic gonadotropin
Which of the following statements about human population in industrialized countries is incorrect?
A) Average family size is relatively small. B) The population has undergone the demographic transition. C) Life history is r-selected. D) The survivorship curve is Type I. E) Age distribution is relatively uniform.