Which of the following is an example of a ketose sugar?

Which of the following is the correct sequence of carbohydrates in the order of increasing complexity of chemical structure?

Lactose is composed of ...... .

$C_6H_{12}O_6$ is the molecular formula of which sugar?

Identify the biological importance of carbohydrates from the following statements:
$1$. In the structure of cell wall.
$2$. As a food storage substance.
$3$. In protein synthesis.
$4$. As enzymes.
$5$. In the structure of $DNA$.

The bond present between carbohydrate molecules is known as ...... bond.