If there are only 20 different amino acids, why is it possible to have so many different types of proteins?

Which process can increase the rate of greenhouse gas emissions into the atmosphere in response to a decrease in albedo

In which case would a scientist choose to use a dissecting microscope rather than a compound microscope

This class has taught you that the use of science and medicine in practical ways has become an international endeavor. one of the greatest examples of an international science accomplishment is which allows the profiling of human dna, useful not only to science but also medicine. a) forensic science b) the fbi c) the human genome project d) bioterrorism