Cyanide is a chemical used to dissolve gold and is harmful to the environment and organisms living there. A couple of biochemists came up with the idea of using the bacteria in the genus Pseudomonas to break down the cyanide used by a gold mining company. Which term refers to this use of bacteria?
A. bioremediation
B. bioextraction
C. decomposition
D. biosynthesis
E. immunoextraction
Answer: A
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Occasionally, chromosomes fail to separate during meiosis, leading to daughter cells that have an abnormal number of chromosomes. This phenomenon is called
A. epistasis. B. nondisjunction. C. crossing over. D. pleiotropy. E. chromosome inactivation.
Which reason does not explain the presence of bicarbonate in seawater as being important? a. Bicarbonate makes seawater slightly alkaline
b. Bicarbonate is able to release hydrogen ions in the water. c. Bicarbonate is able to maintain a stable environment for marine organisms. d. Bicarbonate is able to maintain pH levels at a relatively constant value.
When a muscle fiber is relaxed, myosin cannot bind to actin because ____
a. ATP is not present b. the myosin binding site on actin is blocked c. the myosin head is in the wrong shape for binding d. the actin is in the wrong orientation for myosin binding e. the myosin head is 180 degrees from its attachment configuration
Which group of vertebrates will lack a pulmonary circuit?
A. fish B. annelids C. frogs D. birds E. mammals