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1. Biologists frequently use phosphate-buffered solutions in experiments.  You need to prepare a sodium phosphate solution at pH 6.7 by mixing NaH2PO4 and Na2HPO4 (pKa =7.2).  What are the respective concentration of each of these substances if you want the final concentration of phosphate ([HPO4-2]+[H2PO4-] to be 150 mM? 2. Activity […]

Biology 1. Review the major steps of water molecules’ journey from soil to a tree and into leaves. Describe how sugar from photosynthesis is transported throughout the plant. Write a 700- to 1,050-word paper, including the pictures requested below, describing primary and secondary growth in plants and the journey of […]

1. What were the problems in the Pacific halibut fishery, and how were they resolved? 2. Under what conditions will a natural area receive protection? 3. Compare the concept of ecosystem capital with that of natural resources. What do the two reveal about values? 4. Compare and contrast the terms […]

Q1. Richard Neis had symptoms of excessive secretion of PTH (high blood calcium levels), and his physicians were certain he had a parathyroid gland tumour. So far while surgery was performed on his neck, the surgeon might not find the parathyroid glands at all. Where should the surgeon look next […]