Vitamin $A$ was discovered by

Refer to the given structure of adenylic acid. In this,identify $A$.

The given structure represents a low molecular weight organic compound found in living tissues. Identify the category and the missing component $X$ in the structure.
Category $-$ Component

$A$ diet rich in butter,red meat,and eggs,when consumed regularly,will lead to:

Identify the organic compound shown in the given structure.

Which of the following statements is incorrect?