Which of the following is a male sex hormone?

Identify the correct pair having amino acid $(A)$ and the hormone $(B)$ that is an iodinated derivative of the amino acid $(A)$. ($T$ and $Y$ represent one-letter codes for amino acids.)

Observe the following reactions:
$I$) $\text{Sucrose} (aq) + H_2O \xrightarrow{x} \text{glucose} + \text{fructose}$
$II$) $\text{Glucose} (aq) \xrightarrow{y} \text{ethanol} + CO_2$
What are $x$ and $y$ respectively?

Which of the following ions acts as a cofactor in enzymes?

Which one of the following enzymes converts proteins into amino acids?

Hypothyroidism is due to