This protein or protein complex functions in the cell to stop cell division if the cell has experienced extensive DNA damage:
A. Condensin
B. p53
C. APC/C
D. FtsZ
Answer: B
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FtsZ, MreB, and CreS proteins regulate the shape and structure of bacterial (prokaryotes) cells. These proteins are homologous to what structure in eukaryotes?
A. extracellular matrix B. DNA processing enzymes C. cytoskeleton D. organelles E. cell wall
After a decline to an historic low about 300 million years ago, carbon dioxide levels in the Earth's atmosphere rose again for a while. Hypothesize a reason why this occurred.
A. All the vegetation that had been produced prior to the historic low decayed, releasing carbon dioxide. B. Higher oxygen levels resulted in the proliferation of aerobic bacteria; their respiration released large amounts of carbon dioxide. C. Higher temperatures caused an increase in plant growth, resulting in an increase in the amount of carbon dioxide synthesized. D. Lower temperatures resulted in reduced plant growth; with less vegetation to absorb carbon dioxide, the carbon dioxide levels rose. E. Higher oxygen levels promoted large-scale fires across the landscape; the breakdown of organic molecules in these fires released carbon dioxide.
Four of the five processes listed below are involved
in gene action. Select the exception. a. replication b. transcription c. translation d. polymerization e. polysome activity
The endosymbiotic theory is supported by the work
of __________ on bacteria-infected Amoeba proteus. a. Stanley Miller b. Jeon Kwang c. Thomas Brock d. Lynn Margulis e. Australian researchers