Which of the following enzymes converts starch into maltose?

Which of the following proteins acts as a messenger in living system?

Enzyme activity is maximum at $.......$ $K$.

$C_{12}H_{22}O_{11} + H_2O \stackrel{\text{Enzyme A}}{\longrightarrow} C_6H_{12}O_6 + C_6H_{12}O_6$
$\text{Sucrose} \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \text{Glucose} \quad \quad \quad \quad \text{Fructose}$
$C_6H_{12}O_6 \stackrel{\text{Enzyme B}}{\longrightarrow} 2C_2H_5OH + 2CO_2$
$\text{Glucose}$
In the above reactions,the enzyme $A$ and enzyme $B$ respectively are :-

Which of the following hormones is responsible for the development of secondary female characteristics and participates in the control of the menstrual cycle?

Insulin production and its action in the human body are responsible for regulating blood sugar levels. To which of the following categories does this compound belong?