The role of a metabolite that controls a repressible operon is to
A) bind to the promoter region and decrease the affinity of RNA polymerase for the promoter.
B) bind to the operator region and block the attachment of RNA polymerase to the promoter.
C) increase the production of inactive repressor proteins.
D) bind to the repressor protein and inactivate it.
E) bind to the repressor protein and activate it.
Ans: E) bind to the repressor protein and activate it.
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You are studying a type of cell that you don't know much about. You want to determine what organism the cell comes from. You decide to watch cell division in this plant using the appropriate cell biology tools
After some experimentation, you determine that cytokinesis in this cell is sensitive to myosin inhibitors. You are likely studying A. a plant cell. B. an animal cell. C. a bacterial cell. D. a cell type that has not been previously studied.
Recovery from a mass extinction requires about how
long? a. 100,000 years b. none of these because recovery is never possible c. about as long as the extinction required d. less than one million years e. at least 10 million years
Identify the two main divisions of the vertebrate skeleton and identify the bones that are representative of each
division. What will be an ideal response?
An important function of nomenclature is to
A. facilitate unambiguous communication. B. clarify relationships among organisms. C. provide an understanding of evolutionary relationships. D. define the characteristics used for classification. E. provide a detailed description of an organism.