How did Lutzoni and Pagel (1997) conclude that the entire genome of mutualistic fungi evolved faster than the genome of free-living fungi?
a. They based their estimate on the branch lengths in the phylogeny of a single gene.
b. They compared the evolutionary rates of multiple genes.
c. They conducted a genome scan at a great number of variable loci using microarray technology.
d. Their "conclusion" is mere speculation and is not backed up by data.
B
You might also like to view...
Based on the principle of species individuality, how would you predict that climate change would affect the geographical range of species within a community?
A. Each species would shift its range in a unique manner, according to its physiological needs. B. All species in the community would migrate together as a "superorganism", because all species are connected. C. Assemblages of species would migrate together in predictable groups. D. Only the competitively dominant species would shift their ranges; less competitive species cannot adapt to climate changes.
The grouping "conidial fungi," also known as "imperfect fungi" or deuteromycetes, is a convenience grouping for
fungi that are not classified in other groups, because the conidial fungi ____.
a. have a dikaryotic phase in their life cycle b. are unicellular c. have no known sexual phase d. have a haploid phase in their life cycle e. lack a cell wall
In Chase and Hershey’s experiments on bacteriophages, why were radioactive sulfur and phosphorus chosen as tagging elements?
a. Both isotopes have similar half-lives, so measurements would not be confounded by radioactive decay. b. Both sulfur and phosphorus are vital to viral metabolism and are readily absorbed into bacteriophages. c. Sulfur doesn’t occur in DNA, nor phosphorus in protein, so these molecules could be easily distinguished. d. The radiation emitted by these isotopes is strong enough to be detected without being lethal to the cells.
Hypotheses are
a. often in the form of a statement. b. often expressed negatively. c. sometimes crude attempts to offer a possible explanation for observations. d. testable predictions. e. all of these.