Hormone X activates the cAMP second messenger system in its target cells. The gr
ID: 178650 • Letter: H
Question
Hormone X activates the cAMP second messenger system in its target cells. The greatest response by a cell would come from _____.
Pick the correct answer and explain why it is the correct answer. Also mention why the other three are wrong
A) applying a molecule of hormone X to the extracellular fluid surrounding the cell
B) injecting a molecule of hormone X into the cytoplasm of the cell
C) applying a molecule of cAMP to the extracellular fluid surrounding the cell
D) injecting a molecule of activated, cAMP-dependent protein kinase into the cytoplasm of the cell
Explanation / Answer
A. applying a molecule of hormone X to the extracellular fluid surrounding the cell.
Cell signalling is been extensively studied in human diseases.When a signal is sent between twocels, then one of the cells send a peptide signal to the environment and provokes or induces the cell to release extracellular fluid which signals to the actual receptors and conducts the impulse,This cAMP is a second messenger used for intracellular transduction such as transferring into cells the effects of hormones like glucagonand adrenaline, which cannot pass through the plasma memebrane. It is also involved in activation of protein kinases.This cAMP is rsponsible for intracellular signal transduction
The B option canot be right beacuse the hormoneX whenactivates the cAMP second messenger system it send s the immediate response to the fluid adjacent to it than the cytoplasm of the cell.
The C answer explains that molecule of cAMP itself gives greatest response to the fluid outside wherein it just acts as an intracellular transduction
The D option wherein injecting a molecule of activated , cAMP dependent protein kinase into cytoplasm of the cell indicates that the enzyme cannot be activated by the second messenger and induced into the cytoplasm.
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