Discovery of the bacterial cytoskeletal protein FtsZ provided an important link in the evolution of cells since ________.
A. it is only present in E. coli
B. it is unrelated to any eukaryotic proteins
C. it has no known function
D. is was also discovered in mitochondria and chloroplasts
Answer: D
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Estimates vary, but reasonable numbers for extinction rates suggest that extinction is occurring at a rate approximately
____ times above the normal background rate. a. 10 b. 100 c. 1000 d. 10,000 e. 1,000,000
In a normal fruit fly (Drosophila), the second thoracic segment has wings and the third thoracic segment has halteres (small knobbed structures that act as a balance and guidance system). A mutant fruit fly is identified in which the third thoracic segment produces wings instead of halteres. This abnormal fly has a mutation in which of the following?
A. a homeotic gene B. a segment polarity gene C. a maternal effect gene D. a gap gene
Acute gastroenteritis that occurs after an incubation period of two to three days and commonly affects children is probably caused by
A) Giardia. B) rotavirus. C) Salmonella. D) Staphylococcus aureus. E) Trichinella.
Although E. coli DNA polymerase I is not a replicase, it participates in DNA replication. What is its function?
a. It synthesizes Okazaki fragments. b. It replaces the RNA primer with DNA. c. It unwinds the double helix. d. It synthesizes an RNA primer. e. It connects the 3? end of one Okazaki fragment with the 5? end of another.