The subunits of proteins are called  amino acids. Amino acid molecules are smaller than protein  molecules and are inside of the protein molecules.        Aminâ¦o acids are joined together by peptide bonds where the -COOH  group and the -NH2 group of two consecutive amino acids bond with  the loss of a water molecule.
How Much Does USPS Certified Mail Cost for 2017 The cost for sending by Certified Mail is $3.35. This was the amount set on January 22, 2017 by the post office. Five cents over the rate set in 2016. Certified is a fee that is independent of mailing or postage, And if the sender chooses to mail with an accompanying paper Return Receipt, a $2.75 fee applies (up $.05 over 2016). For an electronic receipt, just over half that much at $1.45.
3. Pay the appropriate postage for the specified type of mail delivery. Then pay for additional services, including a fee for USPS Certified Mail ($3.30USD as of 8/18/2014 and Return receipt (PS Form 3811) cost $2.70). 1  Both first-class and priority mail can be sent via certified mail.2  First-class mail includes envelopes and packages that weigh 13 ounces or less.. Pay the appropriate postage for the specified type of mail delivery. Then pay for additional services, including a fee for USPS Certified Mail ($3.30USD as of 8/18/2014 and Return receipt (PS Form 3811) cost $2.70). 1  Both first-class and priority mail can be sent via certified mail.