Methanogenic Archaea are
A. obligate anaerobes that produce methane.
B. obligate anaerobes that consume methane.
C. obligate aerobes that consume methane.
D. obligate aerobes that produce methane.
Answer: A
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A point mutation that causes a premature stop codon is called a:
A. missense mutation. B. nonsense mutation. C. silent mutation. D. frameshift mutation.
If peach trees growing in specific mild climates of
the southern United States do not receive about 850 hours of temperatures below 40 degrees, they will not produce flowers in the spring. This effect is explained by which of the following terms? a. photoperiodism b. phototropism c. senescence d. vernalization e. dormancy
Answer the following questions true (T) or false (F)
1. The job of an ecologist is to preserve the natural world. 2. All the members of a single species of frog in a particular pond would be an example of a population. 3. A community of organisms and the physical environment with which they interact is an ecosystem.
Jim is suffering from congestive heart failure, in which blood flow is backed up in his lungs and excess fluid is escaping the blood and accumulating in his lung tissue. If untreated, increasing pulmonary edema will lead to death by suffocation. What is the most likely cause of Jim's congestive heart failure?
A. Contraction of his left ventricle is not keeping up with contraction of his right ventricle. B. Jim's SA node is malfunctioning. C. Jim's pulmonary semilunar valve is not opening properly. D. Contraction of his right atrium is not keeping up with contraction of his left atrium. E. Jim's right atrioventricular valve (tricuspid valve) is not closing properly.