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.
The cost to send a 1-ounce USPS Certified Mail letter with Return Receipt (Green Card) will be $6.74. If you use Electronic Delivery Confirmation the cost can be reduced to $4.69. Additional options such as Return Receipt Signature Electronic in PDF format cost $1.40. The First Class 1 oZ.he cost to send a 1-ounce USPS Certified Mail letter with Return Receipt (Green Card) will be $6.74. If you use Electronic Delivery Confirmation the cost can be reduced to $4.69. Additional options such as Return Receipt Signature Electronic in PDF format cost $1.40. The First Class 1 oZ.