Elephants are not the most common species in African grasslands. The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. The newly growing forests support fewer species than the previous grasslands. Which of the following describes why elephants are the keystone species in this scenario?

#Question id: 5307

#Unit 11. Evolution and Behavior

Which of the following techniques would be most appropriate to test the hypothesis that humans and chimps differ in the expression of a large set of shared genes?

#Question id: 5306

#Unit 11. Evolution and Behavior

 If the sequence of a cDNA has matches with DNA sequences in the genome, then this genomic DNA could be described by which of the following statements?

#Question id: 5305

#Unit 11. Evolution and Behavior

After finding a new medicinal plant, a pharmaceutical company decides to determine if the plant has genes similar to those of other known medicinal plants. What would annotation of the genome of this plant allow the company to determine?

#Question id: 5304

#Unit 11. Evolution and Behavior

Bioinformatics includes ________.

I. using computer programs to align DNA sequences

II. creating recombinant DNA from separate species

III. developing computer-based tools for genome analysis

IV. using mathematical tools to make sense of biological systems

#Question id: 5302

#Unit 11. Evolution and Behavior

Using modern techniques of sequencing by synthesis and the shotgun approach, sequences are assembled into chromosomes by ________.

#Question id: 5232

#Unit 11. Evolution and Behavior

Using molecular clock, it was estimated that two species X and Y must have diverged from their common ancestor about 5 x 10^6 years ago. If the rate of divergence per base pair is estimated to be 0.06 per million years, what is the proportion of base pairs that differ between the two species now?