Anewly discovered hormone contains four amino acids linked together. under which chemical class would this hormone be classified?
lipid-derived hormone
amino acid-derived hormone
peptide hormone
glycoprotein

Alaska and northern canada have a diet rich in vitamin d and their skin color is darker than predicted on the basis of iv intensity at their latitude. explain the observation:

Agene in a type of bacteria when the ses bacteria reproduce asexually this mutation can only be inherited by

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.