Examlex
Which of the following is a source of external capital?
Cyclic AMP
A secondary messenger important in many biological processes, formed from ATP by the action of adenylyl cyclase.
Second Messenger
A substance (e.g., cyclic AMP or calcium ions) that relays a message from a signaling molecule (the first messenger) bound to a cell-surface receptor; leads to some change in the cell.
Protein Kinase A
An enzyme that transfers phosphate groups from ATP to specific proteins, playing a key role in the regulation of cellular processes.
Tyrosine Kinases
A family of enzymes that catalyze the transfer of a phosphate group from ATP to a tyrosine residue in a protein, playing key roles in signal transduction pathways.
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