Name the sugar present in milk. How many monosaccharide units are present in it? What are such oligosaccharides called?
Sugar present in milk is known as lactose sugar. Two units of monosaccharides $\beta$-D-galactose and $\beta$-D-glucose are linked together. Hence, are known as disaccharides.
How do you explain the presence of all the six carbon atoms in glucose in a straight chain?
Glucose on heating with HI produces $n$-hexane.
This suggests that all the six carbon atoms of glucose are linked in a straight chain.
In nucleoside, a base is attached at $1^{\prime}$ position of sugar moiety. Nucleotide is formed by linking of phosphoric acid unit to the sugar unit of nucleoside. At which position of sugar unit is the phosphoric acid linked in a nucleoside to give a nucleotide?
Phosphoric acid is linked at 5'-position of sugar moiety of nucleoside to give a nucleotide.
Name the linkage connecting monosaccharide units in polysaccharides.
Glycosidic linkage connects monosaccharide units in polysaccharides.
Under what condtions glucose is converted to gluconic acid and saccharide acid?
Glucose on oxidation with $\mathrm{Br}_2 / \mathrm{H}_2 \mathrm{O}$ produces gluconic acid (six carbon carboxylic acid).
Glucose on oxidation with nitric acid produces saccharic acid. (dicarboxylic acid)
