Homeostasis ________
A) is the maintenance of an unchanging internal state
B) is a pathological condition
C) is the maintenance of a relatively stable internal environment
D) is the way the internal environment influences the external environment
C
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If 5-bromouracil was added to a culture of actively dividing bacterial cells, resulting mutations could eventually become a stable part of the cellular genome.
Answer the following statement true (T) or false (F)
The most important chemical group that determines how tightly histones bind DNA is
A) acetyl. B) methyl. C) ethyl. D) phosphate.
You just returned from a hiking/camping trip and are experiencing symptoms of an infection: high fever, swollen lymph nodes, and black-and-blue marks or hemorrhages under the skin. Your doctor asks if you have been in the four corners area of the U.S. (where the states of Arizona, Colorado, New Mexico, and Utah all meet). What does the doctor suspect?
A. Hemorrhagic fever is often associated with bats in that region of the U.S. B. Since there are many mosquitoes in that area, you might have been infected with Plasmodium. C. Those four states have high rates of Chikungunya, which is what the doctor suspects that you have. D. You might have picked up the plague bacterium from fleas that normally feed on rodents in that area.
ALL of the following genera may be found at hydrothermal vent sites EXCEPT
a. Sulfolobus. b. Pyrolobus. c. Pyrodictium. d. Staphylothermus.