The extra costs forprenatal care and complicated births among women whosmoke during pregnancy are more than $4 billion ayear. 1 Care for childhood illnesses resulting fromexposure to tobacco smoke costs nearly $8 billion a year.As a result, reducing parental smoking can producesubstantial economic benefits for society.
If the amine and carboxylic acid functional groups in amino acids join together to form amide bonds, a chain of amino acid units, called a peptide, is formed. A simple tetrapeptide structure is shown in the following diagram.
4) an enzyme forms a peptide bond between the amino acids in the P-site. 5) the ribosome moves down again and the second tRNA moves to the P-site. A third tRNA brings in another amino acid. A. peptide bond in formed in the P-site and the ribosome moves down.