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Question: The pyrimidine and purine bases are nitrogen containing compounds. What is the source of nitrogen for these two ring systems? In most examples, the reaction to add nitrogen to the growing ring structure requires an activation of a carbon atom. What is the common mechanism used to carry out this activation? Be able to recognize this when you see a reaction of this sort. Question: The activity of ribonucleotide reductase is regulated in two ways: its total activity is controlled and its substrate specificity is controlled. What are the metabolites that regulate both of these activities? How does the cell balance the concentration of the various deoxynucleotide diphosphates? What is the principal similarity between ribonucleotide reductase and the nitrogenase complex?
By studying a large population of sego lilies on side of kinport peak, your colleague is interested in knowing the degree to which global climate change is affecting natural populations in Idaho.
Dr. Don McPhail and his colleagues hypothesized that the existence of the benthic and limnetic sticklebacks is the result of allopatric speciation.
The man married with a woman whose sister had galactosemia. The woman is now pregnant with their first child. What is the possibility that this child will have galactosemia.
Most flour beetles are black, but several color variants are known. Crosses of pure-breeding parents created the following results in the F1 generation.
In the figure below, suppose the left-hand individual is selfed. What pattern of radioactive bands would you see in a Southern analysis of the progeny?
2-experimental varieties of strawberry are produced by crossing a hexaploid line that contains 48 chromosomes and a tetraploid line that contains thirty-two chromosomes.
Non-competitive inhibitors of enzymes change the slope and Km of the Lineweaver Burk graph compared to no inhibitor.
While working in a cell biology laboratory, you are instructed to create a solution that is iso-osmostice to the cells that the lab uses.
During the Calvin-Benson cycle, in the red Columbine plant, high-energy electrons are transferred into a newly made three carbon compound.
Within the two groups defined by bone mass, smaller skeletons have bones with evidence of epiphyseal plates, but the larger skeletons have only a thin line where the epiphyseal plates should be. Give the age group and gender of the four individuals i..
Describe why biological information of amino acid sequences in proteins is encoded in codons composed of 3 nucleotides and NOT 2 nucleotides.
Give one example of humans evolving over the past 10,000 years. Explain why and how evolution is take place?
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