Question

A tyrosine kinase receptor is different from a G-protein linked receptor in that it can trigger

a. more than onepathway at the same time.
b. When both signal moleculesare in their receptor sites, the molecules form a dimer – two molecules joined together.
c. ATP is converted to ADP and the phosphate groupgets attached to the tyrosine molecules.
d. The addition of the phosphate groups / relay proteinscauses a cascade of cellular responses.

Answer 1

The correct answer is c) ATP is converted to ADP and the phosphate group gets attached to the tyrosine molecules, a process called autophosphorylation, which is distinct to the tyrosine kinase receptor as compared to a G-protein linked receptor.

Step-by-step explanation:

A tyrosine kinase receptor is different from a G-protein linked receptor in several ways, but regarding the options provided, the correct answer is c) ATP is converted to ADP, and the phosphate group gets attached to the tyrosine molecules. This process is known as autophosphorylation.

When a signaling molecule binds to the extracellular domain of the tyrosine kinase receptor, two receptors dimerize, leading to the autophosphorylation of tyrosine residues on their intracellular domains. This initiates a downstream cellular response. On the other hand, a G-protein linked receptor, upon ligand binding, activates a G-protein by facilitating the exchange of GDP for GTP, which then triggers a separate signaling pathway often involving second messengers like cAMP.

The kinase function of the tyrosine kinase receptor, which directly transfers phosphate groups from ATP to tyrosine residues, is distinct from the mechanism of G-protein-linked receptors, and it enables the activation of multiple signal transduction pathways.

Answer 2

a. more than one pathway at the same time.

Step-by-step explanation:

Basically, RTK (receptor kinase receptor) principally activate many different transduction pathways about 10 or more and many cellular response in living cells.Thus, its activates more than one signal transduction pathways at once, (compare to G-protein ), and with this mechanisms it aids in coordination of some aspects of cell growth and cell reproduction .