Which of the following statements are correct? a) In maltose, C-1 of one - D -glucose is linked to C -4 of second - D -glucose b) Quaternary structure of protein represents spatial arrangement of two or more polypeptide chains with respect to each other c) Nucleotide units in a nucleic acid are joined to each other through a phosphodiester linkage d) Abnormally low level of thyroxine leads to hypothyroidism

Step-by-step solution

- a) In maltose, ( C -1 ) of one ( - D )-glucose is linked to ( C -4 ) of a second ( - D )-glucose. This is the defining structure of maltose, a disaccharide. The bond between the two glucose units is an ( -1,4 )-glycosidic linkage. - b) Quaternary structure of a protein represents the spatial arrangement of two or more polypeptide chains with respect to each other. This is the correct definition of the quaternary structure of a protein. It describes how multiple protein subunits interact and arrange themselves to