Photoreactivation repairs thymine dimers by splitting them back into separate thymines.
Answer the following statement true (T) or false (F)
True
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Which of the following is a hypothesis to explain the origin of the eukaryotic cell?
A. A eukaryotic cell evolved first, then incorporated a proteobacterial cell that became a mitochondrion. B. A eukaryotic cell evolved first, then incorporated a cyanobacterial cell that became a chloroplast. C. A cyanobacterial cell became incorporated into an archaeon the same time that eukaryotes developed. D. A eukaryotic cell evolved first, then incorporated a cyanobacterial cell that became a mitochondrion. E. None of the answers options is correct.
Which of the following statements is NOT true for
the animal depicted in the above figure? a. It has a third eye that gets covered over by scales. b. It is a tuatara. c. They walk like salamanders. d. They thrived during the Triassic period. e. All of these are true.
When comparing the gene coding for cytochrome c in several species, it was noted that humans and
chimpanzees share the identical amino acid sequence with a change in only one location. This means that a. humans and chimpanzees can mate and produce viable offspring. b. humans evolved from chimpanzees. c. over time, chimpanzees will eventually evolve into primitive humans. d. humans and chimpanzees are closely related in evolutionary time. e. there is nothing particularly informative about this discovery.
Temporal gene regulation refers to which of the following circumstances?
a. Certain genes are induced only at a particular point in the organism’s life cycle. b. Certain genes are induced only in specific tissues. c. Heat-shock genes are induced during periods of temperature stress. d. "Housekeeping" genes are induced in response to a viral infection. e. Molecular chaperones are synthesized after heavy-metal ingestion.