The incorrect statement about cyclic AMP (cAMP) is that it is a structural component of DNA. cAMP is actually a second messenger derived from ATP that activates specific enzymes within the cell.
The statement about cyclic AMP (cAMP) that is not true is: D) cAMP is a structural component of DNA. cAMP acts as a second messenger and is synthesized from ATP by the enzyme adenylyl cyclase. Once formed, it binds to and activates an enzyme known as cAMP-dependent kinase, or A-kinase, which then activates certain metabolic pathways through phosphorylation of target proteins. cAMP is not a structural component of DNA; rather, it is involved in signal transduction inside cells.