Choose the correct option from the following.

  • A
    The elements present in the Earth's crust are also found in samples of living tissues.
  • B
    Detailed analysis shows that the amount of carbon and hydrogen is generally higher in any living organism compared to the Earth's crust.
  • C
    Elemental analysis of both living organisms and the Earth's crust reveals the presence of $C$,$H$,$O$,and other elements.
  • D
    All of the above.

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The energy released by one molecule of $ATP$ is approximately: (in $kcal$)

The energy stored in the form of chemical bonds is called $ATP$.

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

Match the following columns:
Column $I$ Column $II$
$(A)$ $NAD$ $(i)$ Nicotinamide Adenine Dinucleotide Phosphate
$(B)$ $NADP$ $(ii)$ Flavin Mononucleotide
$(C)$ $FAD$ $(iii)$ Nicotinamide Adenine Dinucleotide
$(D)$ $FMN$ $(iv)$ Flavin Adenine Dinucleotide

The ready source of energy in living cells is

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