What is the general ratio of $C$,$H$,and $O$ in the structure of monosaccharides?

Which of the following is an animal polysaccharide?

Fructose is a

Identify the disaccharides formed by the combination of the following monosaccharides:
Glucose + Glucose $\rightarrow P$
Glucose + Galactose $\rightarrow Q$
Glucose + Fructose $\rightarrow R$

Select the correct option indicating the products of the following reaction:
Lactose $\xrightarrow{\text{Lactase}}$ $\square$ + $\square$

The unbranched polysaccharide chain made up of glucose units present in starch is: