When a segment of DNA duplicates, causing two copies of a gene to be present in the chromosome, the duplicate copy could possibly (Check all that apply)
A. gain a new function due to mutation.
B. become a centromere.
C. become a pseudogene.
D. lose function due to mutation.
E. become an ortholog.
Answer: D
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How are adjacent nucleotides on a strand of DNA connected to each other?
a. by a hydrophobic interaction b. by a phosphodiester bond c. by a peptide bond d. by a hydrogen bond
Some scientists propose that the kingdom Protista should be broken up into several kingdoms. Which of these statements accurately supports this idea?
a. Protists are all very similar and easy to confuse b. Protista contains very diverse organisms that do not fit into the other kingdoms c. Protists are the most numerous organism on Earth d. Protista evolved before any other kingdoms
The common ancestor shared by mouse and gorilla is at point ________ on the phylogeny shown.
A. A B. B C. C D. D E. E
More than 100 years ago, Charles Darwin and his colleague Thomas Huxley hypothesized that humans share a common ancestor based on:
a. anatomical evidence. b. evidence gathered during Darwin's voyage on the HMS Beagle. c. manipulative experiments. d. All of the above.