Using any aromatic -amino acid as the example answer the following questions: 1. Draw the Fisher projections of possible stereo isomers and designate their configurations. Which of them takes part in molecules of peptides building?
2. Draw the structure of this -amino acid in isoelectric point (IEP). In what region of pH the IEP is situated?

Read these sentences from the text. near the equator, the tropics receive the most rain on a consistent basis. as a result, the fresh water falling into the ocean decrease the salinity of the surface water in that region. [. .] . . as the salt content of sea water increases, so does its density. what can you infer about how rain affects the density of surface water near the equator?

In 2002, the rare earth elements mine in mountain pass, california was closed because

Explain the impact that changing the temperature has on a system in a state of dynamic equilibrium. what will happen when the temperature of an exothermic reaction mixture at equilibrium is increased?