Epinephrine is.....

Statement $-I :$ Iodothyronines can cross the plasma membrane of a cell.
Statement $-II :$ Receptors of iodothyronines are present on the plasma membrane.

Pheromones are also called:
$I.$ Ectohormone
$II.$ Sex attractants
$III.$ Semichemicals
The correct option is:

Which of the following hormones never enters the cytoplasm of the target cell?

$A$ molecule that binds to a receptor and induces post-receptor events in a cell is called ...$A$... and a molecule that binds to the receptor and inhibits all post-receptor events is called ...$B$....

The term 'Hormone' is derived from a: