<span>Each type of organic molecule has its own specific type of functional group. Functional groups in biological molecules play an important role in the formation of molecules like DNA, proteins, carbohydrates, and lipids. Functional groups include: hydroxyl, methyl, carbonyl, carboxyl, amino, phosphate, and sulfhydryl.</span>
        
             
        
        
        
Polypeptide: 
A chain of amino acids linked together by peptide bonds and having a molecular weight of up to about 10,000.
Dipeptide:
A peptide that yields two amino acids on hydrolysis.
 
        
             
        
        
        
These microbial infections that are acquired by hospital patients as they are being used as the compromised host are the nosocomial infections. These type of infections are primarily caused by bacterial pathogens entering the patient's body and mainly causes urinary tract infection, pneumonia, and other illnesses.