Suppose a new form of DNA polymerase III is discovered that does not require a primer to begin synthesis of a new strand. All other properties of the enzyme remain unchanged. If this new enzyme were to be expressed in the same organism that normally expresses DNA polymerase III, what would no longer be necessary to completely replicate all of the cellular DNA?
A. DNA helicase
B. telomerase
C. DNA polymerase I
D. DNA ligase
E. single strand-binding protein
Answer: C
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Lake Victoria is famous for its variety of cichlid fishes. In fact, they offer the most diverse assembly of vertebrates presently known to science. One trait that scientists have focused on as one possible reason for their adaptability is
A. a second set of scales that lie beneath the top outermost scales. B. a second set of jaws in their throats. C. gill arches that are not covered by an operculum, which prevents hiding places for gill parasites. D. digestive tracts that are able to process most substrates, which has eliminated the need for feeding specialization. E. ability to change color in relationship to their environment.
Which of the following homonid species demonstrated bipedalism but still spent time living in the trees?
A. Dryopithecus B. Australopithecus afarensis C. Ardipithecus ramidus D. Australopithecus africanus E. Homo habilis
Which of the following statements pertaining to changes in the global economy of the 21st century is true?
A) Barriers to the free flow of goods, services, and capital have increased B) volume of global output has been growing more rapidly than cross-border trade and investment C) National economies are becoming more independent D) the world is moving toward an economic system that is more favorable for international business
Events that occur during transcriptional regulation in eukaryotes include
A. mRNA translation. B. chromatin conversion to a closed conformation. C. DNA replication. D. polypeptide synthesis. E. RNA processing and export from the nucleus.