Which of the following hormones is a derivative of an amino acid?

Why is thyroxine considered a hormone and not an enzyme?

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A):$ During pregnancy,the level of thyroxine is increased in the maternal blood.
Reason $(R):$ Pregnancy is characterised by metabolic changes in the mother.
In the light of the above statements,choose the most appropriate answer from the options given below:

Deficiency of thyroxine in adults leads to a condition characterized by:
$(i)$. Low metabolic rate
$(ii)$. Increase in body weight
$(iii)$. Tendency to retain water in tissues
This condition is known as:

The rate of metamorphosis is increased by .....

Which of the following is not a genetic disease?