Which of these is a logical signal transduction pathway?
-A receptor tyrosine kinase activates adenylyl cyclase, which activates phospholipase C, which converts ATP into cyclic AMP, which binds to an intracellular enzyme that carries out a response.
-An ion-channel receptor opens, allowing a steroid hormone to enter the cell; the steroid hormone then activates protein kinases that convert GTP to GDP, which binds to an intracellular enzyme that carries out a response.
-A G-protein-linked receptor activates G protein, which activates phospholipase C, which cleaves a membrane lipid to form IP3, which binds to a calcium channel on the ER, which opens to release calcium ions into the cytoplasm, which bind to an intracellular enzyme that carries out a response.
-An intracellular receptor activates phospholipase C, which cleaves a membrane protein to form IP3, which then activates the opening of an ER channel protein, which releases cyclic AMP into the cytoplasm, where it binds to an intracellular enzyme that carries out a response.
A G-protein-linked receptor activates G protein, which activates phospholipase C, which cleaves a membrane lipid to form IP3, which binds to a calcium channel on the ER, which opens to release calcium ions into the cytoplasm, which bind to an intracellular enzyme that carries out a response.
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Granulicatella spp. and Abiotrophia spp. are dependent on which nutritional additive for optimal growth?
a. Vitamin K b. Vitamin B6 c. Vitamin B12 d. Vitamin D
Along with the Earth's rotation, winds have a large influence on ocean currents. Periodic strengthening or weakening of winds can therefore result in dramatic changes to marine and terrestrial ecosystems. El Ninõ is a periodic weakening of the trade winds that normally drive the South Equatorial Current and the Humboldt Current. The weakening of these trade winds during an El Ninõ event slows down or stops the Humboldt Current. What would occur as a result of an El Ninõ event? Check all that apply.
_____ The ocean waters off the west coast of South America would become warmer. _____ Most marine species off the coast of South America would experience rapid population growth. _____ Fisheries that operate off the coast of South America would see declining catches for some species. _____ The ocean water off the coast of South America would become colder.
Zebra mussels, an imported species, have disrupted the ecology of
a. Tennessee. b. the Great Lakes. c. the West Coast of the U.S. d. Yellowstone Park.
What is a reasonable conclusion based on the chi-square analysis?
A dihybrid testcross is made to determine if genes C and D are linked. The results are shown in the table.
A) There is a high probability that the deviation from the expected results is due chance.
B) One can say with a high degree of confidence that genes C and D are linked.
C) The analysis supports the null hypothesis.
D) Genes C and D are most likely unlinked.