If two nonsister species on the phylogenetic tree above differ from the other two in a single character state (say dark or light fur), how many character state changes (evolutionary events) are needed to explain this pattern?
a. one c. three
b. two d. four
D
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Because tobacco mosaic virus has an RNA genome, it must encode a reverse transcriptase
Indicate whether the statement is true or false
The genome of an organism contains 14% guanine; therefore, it's genome also contains ____% thymine and ____%
cytosine.
a. 86; 14 b. 14; 36 c. 36; 36 d. 14; 86 e. 36; 14
Which of the following statements is false?
a. Heat loss represents a one-way loss of energy from an ecosystem. b. Organisms in the food chain are able to utilize all the energy contained in the food that they eat. c. In some ecosystems, the majority of the energy stored in plants does not become available until the plants die. d. Heat and energy are lost by each organism in the ecosystem. e. The two food webs are classified as grazing and detrital.
You suspect that an elderly patient's skin blistering is caused by an autoimmune disorder. If you are correct, the patient's serum likely contains antibodies directed against
A) talin. B) vinculin. C) ?-actinin. D) BPAG2. E) actin.