Which of the following statements about antibiotics is FALSE?
a. Penicillin was the first antibiotic isolated from bacteria and was widely used to fight bacterial infections.
b. Antibiotics, though effective against viruses, are not effective against bacteria.
c. Antibiotics help microbes compete with other microbes.
d. Antibiotics are used not just in human health care, but also in agriculture.
e. Antibiotic-resistant microbes undergo selection in humans who are taking antibiotics
Ans: b. Antibiotics, though effective against viruses, are not effective against bacteria.
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A vesicle can be best compared to a:
A. micelle. B. lipid raft. C. liposome. D. bilayer.
A bloom is a rapid increase in
A. algae. B. temperature. C. light. D. fish.
In any DNA molecule, the number of guanine bases will:
A) always be equal to the number of thymine bases. B) always be equal to the number of adenine bases. C) always be equal to the number of cytosine bases. D) sometimes be equal to the number of thymine bases and will sometimes be equal to the number of adenine bases. E) sometimes be equal to the number of cytosine bases and will sometimes be equal to the number of adenine bases.
The term obligate refers to
A) The ability to exist in a wide range of conditions B) Using light for energy production C) Using oxygen for metabolism D) Using chemicals for energy production E) Existing in a very narrow niche