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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?
The most abundant from of phosphorous has 15 protos, 16 neutrons and 15 electrons. Determine which of the following is an isotope of pgisphorous?
Determine the role the innate and adaptive immune system in controlling cancer formation and progression and compare and contrast the tumor promoting and inhibitory capabilities of the immune system.
The following statement(s) is true about eukaryotic insulators.
What is the possibility that their first child will have attached earlobes. which among the conditions or substances do ALL archaeans need for survival and reproduction.
The bacteria are allowed to grow overnight and are streaked on a plate using a technique that produces isolated colonies that are clones of the original. Samples of these colonies are then grown in four different media: nutrient broth plus ampicillin..
Determine which one of the following amino acids is most likely to participate in hydrogen bonding with water?
Drag the labels onto the graph to indicate which presynaptic neuron produced each change in the axon hillock's membrane potential. Assume that the same number of ligand-gated ion channels opens at each synapse.
Phenylketonuria-Individuals with this disorder are unable to produce the enzyme responsible for the conversion of the amino acid phenylalanine to the amino acid tyrosine.
Biological recognition is significant in many processes explain how the process of recognition occurs while an organism recognizes other members of their own species.
Suppose if you are eating a ham and cheese sandwhich, What steps take place with regard to digesting the sandwich?
For a specific type of cell after 3 hours, the concentration of cells per ml of solution is about 400/mL. After 10 hours the concentration has gone up to 2000/mL.
In a donor population, the allele frequencies for the normal and the sickle-cell allele are 0.9 and 0.1 respectively. A group of 55 individuals migrates to population containing 10,000 individuals.
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