The first amino acid of a new polypeptide chain is

The initiator tRNA carries the amino acid methionine, so the first amino acid of the new polypeptide chain is methionine.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.