The influenza viruses that infect man usually are derived from a type that could also infect:
a. Horses and sheep
b. Cattle and water buffalo
c. Chimpanzees and gorillas
d. Birds and pigs
e. A variety of primates
Answer: d. Birds and pigs
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Answer the following statements true (T) or false (F)
1. Bacterial cells always contain one copy of a circular chromosome. 2. Bacteria can exchange DNA between strains of the same species and between different species. 3. Viroids have a genome but do not translate any of it to protein. 4. All forms of horizontal gene transfer require both the recipient and donor bacteria to be alive.
Sequential growth of microorganisms in which the growth of one organism produces environmental conditions suitable for the subsequent growth of another organism is called ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following represents a consequence of the human effort to increase the carrying capacity of the Earth?
a. pharmaceutical pollution b. global climate change c. acceleration of technology d. returning to coal burning technology
Homeostasis is defined as the ability of an organism to
A. anchor itself to the rocks or soil of a body of water. B. carry out chemical reactions. C. sexually mature. D. withstand extreme temperatures. E. maintain a stable internal environment.