Question

The series of molecules that are activated form a signalling pathway (Figure 3). Central to the signaling pathway are molecules known as kinases and phosphatases. Protein kinases are molecules that catalyze the addition of phosphate groups to proteins there by activating them. Primarily they add phosphate to either tyrosine residues or serine and threonine residues in proteins. Phosphates are molecules that remove a phosphate group from a protein there by de-activating the protein and resulting in shutting down of the pathway. Till date there are a total of 600 known kinases and 100 phosphatases.

Protein kinases O A Remove phosphate groups from proteins there by activating them O B Add phosphate groups to protein there by de-activating them o C Remove phosphate groups from proteins there by de-activating them D Add phosphate groups to proteins there by activating them

Answer 1

Protein kinases activate a compound by adding a phosphate.

So, the answer marked here is correct.

A is incorrect as it does not remove phosphate.

B is incorrect as it does not deactivate the proteins.

C is incorrect as it does not remove phosphate.

Hence D is the correct option.