For many biochemical reactions,$H^+$ and $OH^-$ ions are obtained from which of the following?

Energy released by the hydrolysis of one molecule of $ATP$ is (in $kcal$)

Which of the following statements is $NOT$ true regarding biomolecules?

Statement $X$: Energy transformation always occurs in the metabolism of living organisms.
Reason $Y$: Living organisms continuously obtain energy from food.

The variations observed among different species of organisms are due to the differences in their ......... .

Nutritionally wild-type organisms,which do not require any additional growth supplements,are called .....