CELL SIGNALLING AND TRANSDUCTION QUIZ

second messenger

both (a) and (b)

none of these

first messenger

It contains the receptor for the signaling molecule

It is in the heart muscle

It is incapable of signal transduction

It is also the site of production for the signaling molecule

target cells distant from its site of synthesis in cells of an endocrine organ

target cells close to the cell from which it was secreted

None of these

both (a) and (b)

Signal transduction

Signal integration

Signal amplification

Signal reception

Since it can enter the cell, it directly affects some specific cell process

It is a steroid

It might trigger a signal cascade that causes some effect in a cell

Its receptor is located in the cytosol of the target cell

ATP and GTP by the actions of guanylate cyclase and adenylate cyclase respectively

ATP and GTP by the actions of adenylate cyclase and guanylate cyclase respectively

GTP and ATP by the actions of adenylate cyclase and guanylate cyclase respectively

None of these

Insulin

Adenylate cyclase

Testosterone

Thyroxin

Phospholipase C

Diacyl glycerol

lnositol 1,4,5-triphosphate

Both (a) and (b)

decrease in the concentration of certain extracellular signaling molecules called first messenger

increase in the concentration of certain intracellular signaling molecules called second messenger

increase in the concentration of certain extracellular signaling molecules called first messenger

decrease in the concentration of certain intracellular signaling molecules called second messenger

GDP

Ca2+

phosphorylated serine residues

phosphorylated tyrosine residues