<prompt> Which of the following is a dipeptide?carnosineGlutathioneGlucagonβ-Lipoprotein  <response>: Carnosine is a dipeptide, formed by combination of beta alanine and histidine. Carnosine is a major constituent of muscles. It can activate myosin contraction. Hydrolysis of carnosine to beta alanine and histidine is done by carnosinase. Inherited deficiency of this enzyme will lead to carnosinuria.Reference: Vasudevan 7th ed, pg 215 