Untranslated regions of the mRNA transcript may interact with motor proteins to enhance transport of the mRNA to a distinct region of the cell; or these regions may interact with proteins that repress the translation of the mRNA
A. true
B. false
A
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The central dogma of molecular biology states that information flows from:
A. DNA directly to proteins. B. protein to RNA to DNA. C. DNA to RNA to protein. D. RNA to protein to DNA. E. RNA to DNA to protein.
What is a cost to the female in a polygynous mating system?
A. little opportunity to mate with a genetically fit male B. high risk of contracting sexually transmitted diseases C. little help from male in caring for offspring D. high competition between females for access to males
A calmodulin-regulated kinase (CaM-kinase) is involved in spatial learning and memory. This kinase is able to phosphorylate itself such that its kinase activity is now independent of the intracellular concentration of Ca2+
Thus, the kinase stays active after Ca2+ levels have dropped. Mice completely lacking this CaM-kinase have severe spatial learning defects but are otherwise normal. A. Each of the following mutations also leads to similar learning defects. For each case explain why. (1) a mutation that prevents the kinase from binding ATP (2) a mutation that deletes the calmodulin-binding part of the kinase (3) a mutation that destroys the site of autophosphorylation B. What would be the effect on the activity of CaM-kinase if there were a mutation that reduced its interaction with the protein phosphatase responsible for inactivating the kinase?
The highest number of individuals in the
United States are in the ___ age structure category.
a. pre-reproductive b. early reproductive c. late reproductive d. early post-reproductive e. late post-reproductive