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You are studying a new population of stem cells you have found in lung epithelium. You find there is one novel trascription factor and one novel signaling molecule that are absolutely required for maintenance of the stem cell population but neither is express by the stem cells although they are both found in different populations of cells near the stem cells. What is an explanation for this expression patteren and activity requirement?
Abscisic acid (ABA) hormonal signaling controls important processes in plants. Interestingly, ABA regulated signal transduction may or may not include activation or repression of target gene expression.
How will chronic Hepatitis C impact a female's reproductive system? Discuss sex hormone levels, hypothalamic-pituitary axis changes, fertility and menstruation changes.
Carnivorous plants are phytosynthetic yet, unlike other plants capture insects. Why did they need to evolue this unusual ability? What is plant responses to the environmental stress of drought Flooding?
Determine the genotype and phenotype on the F1 and F2 generations when you cross a wildtype female with a double mutant male.
You perform a forward genetic screen to look for Arabidopsis thaliana mutants that are altered in cold stress responses. You find two mutants with opposite phenotypes.
Discuss how does the altered primary structure of hemoglobin from sickle cell patients affect its tertiary structure?
Calculate the Ki for a competitive inhibitor (I) form the following data by Dixon Plot.
In 1918, the tsar and tsarina of Russia and their five children were presumably assassinated and buried in an unmarked grave. Later, several women came forward and claimed that they were in fact Anastasia.
Explain why is agar typically used as a solidifying agent in microbiological media instead of gelatin? What could happen if gelatin was used?
The term "hominid" has traditionally been used to refer to species in the line the leads to modern humans after the divergence between that line and the line that leads to modern chimpanzees.
Consider this redox reaction that is involved in fermentation. Answer the following questions based on the forward direction of the reaction as shown below.
Describe the four tissue types, nervous, muscle, epithelial, connective. How did tissues and multicellular animals evolve? How do animals develop.
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