Analysis of the structure and function of which of the following molecules would support the descent of all living things from a common ancestor?
A
ATP
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B
Chlorophyll
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C
Hemoglobin
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D
Keratins
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Solution
The correct option is D ATP All the living organisms perform the biological processes which require energy. The energy which is utilised by the cells is in the form of ATP (Adenosine triphosphate) which serves as the energy molecule. The molecule is present as the source of energy in all the living forms which proves that all the life forms have emerged from the common ancestor in which ATP was present. The structure and function of ATP support the theory of a common ancestor of all living organisms.